summaryrefslogtreecommitdiff
path: root/src/w32proc.c
blob: 0046c9e85dc963632f252e912fed363d14c8f725 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
/* Process support for GNU Emacs on the Microsoft Windows API.

Copyright (C) 1992, 1995, 1999-2017 Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */

/*
   Drew Bliss                   Oct 14, 1993
     Adapted from alarm.c by Tim Fleehart
*/

#define DEFER_MS_W32_H
#include <config.h>

#include <mingw_time.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <ctype.h>
#include <io.h>
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>
#include <sys/file.h>
#include <mbstring.h>
#include <locale.h>

/* Include CRT headers *before* ms-w32.h.  */
#include <ms-w32.h>

#undef signal
#undef wait
#undef spawnve
#undef select
#undef kill

#include <windows.h>

#ifdef HAVE_LANGINFO_CODESET
#include <nl_types.h>
#include <langinfo.h>
#endif

#include "lisp.h"
#include "w32.h"
#include "w32common.h"
#include "w32heap.h"
#include "syswait.h"	/* for WNOHANG */
#include "syssignal.h"
#include "w32term.h"
#include "coding.h"

#define RVA_TO_PTR(var,section,filedata) \
  ((void *)((section)->PointerToRawData					\
	    + ((DWORD_PTR)(var) - (section)->VirtualAddress)		\
	    + (filedata).file_base))

extern BOOL g_b_init_compare_string_w;
extern BOOL g_b_init_debug_break_process;

int sys_select (int, SELECT_TYPE *, SELECT_TYPE *, SELECT_TYPE *,
		const struct timespec *, const sigset_t *);

/* Signal handlers...SIG_DFL == 0 so this is initialized correctly.  */
static signal_handler sig_handlers[NSIG];

static sigset_t sig_mask;

static CRITICAL_SECTION crit_sig;

/* Improve on the CRT 'signal' implementation so that we could record
   the SIGCHLD handler and fake interval timers.  */
signal_handler
sys_signal (int sig, signal_handler handler)
{
  signal_handler old;

  /* SIGCHLD is needed for supporting subprocesses, see sys_kill
     below.  SIGALRM and SIGPROF are used by setitimer.  All the
     others are the only ones supported by the MS runtime.  */
  if (!(sig == SIGINT || sig == SIGSEGV || sig == SIGILL
	|| sig == SIGFPE || sig == SIGABRT || sig == SIGTERM
	|| sig == SIGCHLD || sig == SIGALRM || sig == SIGPROF))
    {
      errno = EINVAL;
      return SIG_ERR;
    }
  old = sig_handlers[sig];
  /* SIGABRT is treated specially because w32.c installs term_ntproc
     as its handler, so we don't want to override that afterwards.
     Aborting Emacs works specially anyway: either by calling
     emacs_abort directly or through terminate_due_to_signal, which
     calls emacs_abort through emacs_raise.  */
  if (!(sig == SIGABRT && old == term_ntproc))
    {
      sig_handlers[sig] = handler;
      if (!(sig == SIGCHLD || sig == SIGALRM || sig == SIGPROF))
	signal (sig, handler);
    }
  return old;
}

/* Emulate sigaction. */
int
sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
{
  signal_handler old = SIG_DFL;
  int retval = 0;

  if (act)
    old = sys_signal (sig, act->sa_handler);
  else if (oact)
    old = sig_handlers[sig];

  if (old == SIG_ERR)
    {
      errno = EINVAL;
      retval = -1;
    }
  if (oact)
    {
      oact->sa_handler = old;
      oact->sa_flags = 0;
      oact->sa_mask = empty_mask;
    }
  return retval;
}

/* Emulate signal sets and blocking of signals used by timers.  */

int
sigemptyset (sigset_t *set)
{
  *set = 0;
  return 0;
}

int
sigaddset (sigset_t *set, int signo)
{
  if (!set)
    {
      errno = EINVAL;
      return -1;
    }
  if (signo < 0 || signo >= NSIG)
    {
      errno = EINVAL;
      return -1;
    }

  *set |= (1U << signo);

  return 0;
}

int
sigfillset (sigset_t *set)
{
  if (!set)
    {
      errno = EINVAL;
      return -1;
    }

  *set = 0xFFFFFFFF;
  return 0;
}

int
sigprocmask (int how, const sigset_t *set, sigset_t *oset)
{
  if (!(how == SIG_BLOCK || how == SIG_UNBLOCK || how == SIG_SETMASK))
    {
      errno = EINVAL;
      return -1;
    }

  if (oset)
    *oset = sig_mask;

  if (!set)
    return 0;

  switch (how)
    {
    case SIG_BLOCK:
      sig_mask |= *set;
      break;
    case SIG_SETMASK:
      sig_mask = *set;
      break;
    case SIG_UNBLOCK:
      /* FIXME: Catch signals that are blocked and reissue them when
	 they are unblocked.  Important for SIGALRM and SIGPROF only.  */
      sig_mask &= ~(*set);
      break;
    }

  return 0;
}

int
pthread_sigmask (int how, const sigset_t *set, sigset_t *oset)
{
  if (sigprocmask (how, set, oset) == -1)
    return EINVAL;
  return 0;
}

int
sigismember (const sigset_t *set, int signo)
{
  if (signo < 0 || signo >= NSIG)
    {
      errno = EINVAL;
      return -1;
    }
  if (signo > sizeof (*set) * CHAR_BIT)
    emacs_abort ();

  return (*set & (1U << signo)) != 0;
}

pid_t
getpgrp (void)
{
  return getpid ();
}

pid_t
tcgetpgrp (int fd)
{
  return getpid ();
}

int
setpgid (pid_t pid, pid_t pgid)
{
  return 0;
}

pid_t
setsid (void)
{
  return getpid ();
}

/* Emulations of interval timers.

   Limitations: only ITIMER_REAL and ITIMER_PROF are supported.

   Implementation: a separate thread is started for each timer type,
   the thread calls the appropriate signal handler when the timer
   expires, after stopping the thread which installed the timer.  */

struct itimer_data {
  volatile ULONGLONG expire;
  volatile ULONGLONG reload;
  volatile int terminate;
  int type;
  HANDLE caller_thread;
  HANDLE timer_thread;
};

static ULONGLONG ticks_now;
static struct itimer_data real_itimer, prof_itimer;
static ULONGLONG clocks_min;
/* If non-zero, itimers are disabled.  Used during shutdown, when we
   delete the critical sections used by the timer threads.  */
static int disable_itimers;

static CRITICAL_SECTION crit_real, crit_prof;

/* GetThreadTimes is not available on Windows 9X and possibly also on 2K.  */
typedef BOOL (WINAPI *GetThreadTimes_Proc) (
  HANDLE hThread,
  LPFILETIME lpCreationTime,
  LPFILETIME lpExitTime,
  LPFILETIME lpKernelTime,
  LPFILETIME lpUserTime);

static GetThreadTimes_Proc s_pfn_Get_Thread_Times;

#define MAX_SINGLE_SLEEP    30
#define TIMER_TICKS_PER_SEC 1000

/* Return a suitable time value, in 1-ms units, for THREAD, a handle
   to a thread.  If THREAD is NULL or an invalid handle, return the
   current wall-clock time since January 1, 1601 (UTC).  Otherwise,
   return the sum of kernel and user times used by THREAD since it was
   created, plus its creation time.  */
static ULONGLONG
w32_get_timer_time (HANDLE thread)
{
  ULONGLONG retval;
  int use_system_time = 1;
  /* The functions below return times in 100-ns units.  */
  const int tscale = 10 * TIMER_TICKS_PER_SEC;

  if (thread && thread != INVALID_HANDLE_VALUE
      && s_pfn_Get_Thread_Times != NULL)
    {
      FILETIME creation_ftime, exit_ftime, kernel_ftime, user_ftime;
      ULARGE_INTEGER temp_creation, temp_kernel, temp_user;

      if (s_pfn_Get_Thread_Times (thread, &creation_ftime, &exit_ftime,
				  &kernel_ftime, &user_ftime))
	{
	  use_system_time = 0;
	  temp_creation.LowPart = creation_ftime.dwLowDateTime;
	  temp_creation.HighPart = creation_ftime.dwHighDateTime;
	  temp_kernel.LowPart = kernel_ftime.dwLowDateTime;
	  temp_kernel.HighPart = kernel_ftime.dwHighDateTime;
	  temp_user.LowPart = user_ftime.dwLowDateTime;
	  temp_user.HighPart = user_ftime.dwHighDateTime;
	  retval =
	    temp_creation.QuadPart / tscale + temp_kernel.QuadPart / tscale
	    + temp_user.QuadPart / tscale;
	}
      else
	DebPrint (("GetThreadTimes failed with error code %lu\n",
		   GetLastError ()));
    }

  if (use_system_time)
    {
      FILETIME current_ftime;
      ULARGE_INTEGER temp;

      GetSystemTimeAsFileTime (&current_ftime);

      temp.LowPart = current_ftime.dwLowDateTime;
      temp.HighPart = current_ftime.dwHighDateTime;

      retval = temp.QuadPart / tscale;
    }

  return retval;
}

/* Thread function for a timer thread.  */
static DWORD WINAPI
timer_loop (LPVOID arg)
{
  struct itimer_data *itimer = (struct itimer_data *)arg;
  int which = itimer->type;
  int sig = (which == ITIMER_REAL) ? SIGALRM : SIGPROF;
  CRITICAL_SECTION *crit = (which == ITIMER_REAL) ? &crit_real : &crit_prof;
  const DWORD max_sleep = MAX_SINGLE_SLEEP * 1000 / TIMER_TICKS_PER_SEC;
  HANDLE hth = (which == ITIMER_REAL) ? NULL : itimer->caller_thread;

  while (1)
    {
      DWORD sleep_time;
      signal_handler handler;
      ULONGLONG now, expire, reload;

      /* Load new values if requested by setitimer.  */
      EnterCriticalSection (crit);
      expire = itimer->expire;
      reload = itimer->reload;
      LeaveCriticalSection (crit);
      if (itimer->terminate)
	return 0;

      if (expire == 0)
	{
	  /* We are idle.  */
	  Sleep (max_sleep);
	  continue;
	}

      if (expire > (now = w32_get_timer_time (hth)))
	sleep_time = expire - now;
      else
	sleep_time = 0;
      /* Don't sleep too long at a time, to be able to see the
	 termination flag without too long a delay.  */
      while (sleep_time > max_sleep)
	{
	  if (itimer->terminate)
	    return 0;
	  Sleep (max_sleep);
	  EnterCriticalSection (crit);
	  expire = itimer->expire;
	  LeaveCriticalSection (crit);
	  sleep_time =
	    (expire > (now = w32_get_timer_time (hth))) ? expire - now : 0;
	}
      if (itimer->terminate)
	return 0;
      if (sleep_time > 0)
	{
	  Sleep (sleep_time * 1000 / TIMER_TICKS_PER_SEC);
	  /* Always sleep past the expiration time, to make sure we
	     never call the handler _before_ the expiration time,
	     always slightly after it.  Sleep(5) makes sure we don't
	     hog the CPU by calling 'w32_get_timer_time' with high
	     frequency, and also let other threads work.  */
	  while (w32_get_timer_time (hth) < expire)
	    Sleep (5);
	}

      EnterCriticalSection (crit);
      expire = itimer->expire;
      LeaveCriticalSection (crit);
      if (expire == 0)
	continue;

      /* Time's up.  */
      handler = sig_handlers[sig];
      if (!(handler == SIG_DFL || handler == SIG_IGN || handler == SIG_ERR)
	  /* FIXME: Don't ignore masked signals.  Instead, record that
	     they happened and reissue them when the signal is
	     unblocked.  */
	  && !sigismember (&sig_mask, sig)
	  /* Simulate masking of SIGALRM and SIGPROF when processing
	     fatal signals.  */
	  && !fatal_error_in_progress
	  && itimer->caller_thread)
	{
	  /* Simulate a signal delivered to the thread which installed
	     the timer, by suspending that thread while the handler
	     runs.  */
	  HANDLE th = itimer->caller_thread;
	  DWORD result = SuspendThread (th);

	  if (result == (DWORD)-1)
	    return 2;

	  handler (sig);
	  ResumeThread (th);
	}

      /* Update expiration time and loop.  */
      EnterCriticalSection (crit);
      expire = itimer->expire;
      if (expire == 0)
	{
	  LeaveCriticalSection (crit);
	  continue;
	}
      reload = itimer->reload;
      if (reload > 0)
	{
	  now = w32_get_timer_time (hth);
	  if (expire <= now)
	    {
	      ULONGLONG lag = now - expire;

	      /* If we missed some opportunities (presumably while
		 sleeping or while the signal handler ran), skip
		 them.  */
	      if (lag > reload)
		expire = now - (lag % reload);

	      expire += reload;
	    }
	}
      else
	expire = 0;	/* become idle */
      itimer->expire = expire;
      LeaveCriticalSection (crit);
    }
  return 0;
}

static void
stop_timer_thread (int which)
{
  struct itimer_data *itimer =
    (which == ITIMER_REAL) ? &real_itimer : &prof_itimer;
  int i;
  DWORD err = 0, exit_code = 255;
  BOOL status;

  /* Signal the thread that it should terminate.  */
  itimer->terminate = 1;

  if (itimer->timer_thread == NULL)
    return;

  /* Wait for the timer thread to terminate voluntarily, then kill it
     if it doesn't.  This loop waits twice more than the maximum
     amount of time a timer thread sleeps, see above.  */
  for (i = 0; i < MAX_SINGLE_SLEEP / 5; i++)
    {
      if (!((status = GetExitCodeThread (itimer->timer_thread, &exit_code))
	    && exit_code == STILL_ACTIVE))
	break;
      Sleep (10);
    }
  if ((status == FALSE && (err = GetLastError ()) == ERROR_INVALID_HANDLE)
      || exit_code == STILL_ACTIVE)
    {
      if (!(status == FALSE && err == ERROR_INVALID_HANDLE))
	TerminateThread (itimer->timer_thread, 0);
    }

  /* Clean up.  */
  CloseHandle (itimer->timer_thread);
  itimer->timer_thread = NULL;
  if (itimer->caller_thread)
    {
      CloseHandle (itimer->caller_thread);
      itimer->caller_thread = NULL;
    }
}

/* This is called at shutdown time from term_ntproc.  */
void
term_timers (void)
{
  if (real_itimer.timer_thread)
    stop_timer_thread (ITIMER_REAL);
  if (prof_itimer.timer_thread)
    stop_timer_thread (ITIMER_PROF);

  /* We are going to delete the critical sections, so timers cannot
     work after this.  */
  disable_itimers = 1;

  DeleteCriticalSection (&crit_real);
  DeleteCriticalSection (&crit_prof);
  DeleteCriticalSection (&crit_sig);
}

/* This is called at initialization time from init_ntproc.  */
void
init_timers (void)
{
  /* GetThreadTimes is not available on all versions of Windows, so
     need to probe for its availability dynamically, and call it
     through a pointer.  */
  s_pfn_Get_Thread_Times = NULL; /* in case dumped Emacs comes with a value */
  if (os_subtype != OS_9X)
    s_pfn_Get_Thread_Times =
      (GetThreadTimes_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
					   "GetThreadTimes");

  /* Make sure we start with zeroed out itimer structures, since
     dumping may have left there traces of threads long dead.  */
  memset (&real_itimer, 0, sizeof real_itimer);
  memset (&prof_itimer, 0, sizeof prof_itimer);

  InitializeCriticalSection (&crit_real);
  InitializeCriticalSection (&crit_prof);
  InitializeCriticalSection (&crit_sig);

  disable_itimers = 0;
}

static int
start_timer_thread (int which)
{
  DWORD exit_code, tid;
  HANDLE th;
  struct itimer_data *itimer =
    (which == ITIMER_REAL) ? &real_itimer : &prof_itimer;

  if (itimer->timer_thread
      && GetExitCodeThread (itimer->timer_thread, &exit_code)
      && exit_code == STILL_ACTIVE)
    return 0;

  /* Clean up after possibly exited thread.  */
  if (itimer->timer_thread)
    {
      CloseHandle (itimer->timer_thread);
      itimer->timer_thread = NULL;
    }
  if (itimer->caller_thread)
    {
      CloseHandle (itimer->caller_thread);
      itimer->caller_thread = NULL;
    }

  /* Start a new thread.  */
  if (!DuplicateHandle (GetCurrentProcess (), GetCurrentThread (),
			GetCurrentProcess (), &th, 0, FALSE,
			DUPLICATE_SAME_ACCESS))
    {
      errno = ESRCH;
      return -1;
    }
  itimer->terminate = 0;
  itimer->type = which;
  itimer->caller_thread = th;
  /* Request that no more than 64KB of stack be reserved for this
     thread, to avoid reserving too much memory, which would get in
     the way of threads we start to wait for subprocesses.  See also
     new_child below.  */
  itimer->timer_thread = CreateThread (NULL, 64 * 1024, timer_loop,
				       (void *)itimer, 0x00010000, &tid);

  if (!itimer->timer_thread)
    {
      CloseHandle (itimer->caller_thread);
      itimer->caller_thread = NULL;
      errno = EAGAIN;
      return -1;
    }

  /* This is needed to make sure that the timer thread running for
     profiling gets CPU as soon as the Sleep call terminates. */
  if (which == ITIMER_PROF)
    SetThreadPriority (itimer->timer_thread, THREAD_PRIORITY_TIME_CRITICAL);

  return 0;
}

/* Most of the code of getitimer and setitimer (but not of their
   subroutines) was shamelessly stolen from itimer.c in the DJGPP
   library, see www.delorie.com/djgpp.  */
int
getitimer (int which, struct itimerval *value)
{
  volatile ULONGLONG *t_expire;
  volatile ULONGLONG *t_reload;
  ULONGLONG expire, reload;
  __int64 usecs;
  CRITICAL_SECTION *crit;
  struct itimer_data *itimer;

  if (disable_itimers)
    return -1;

  if (!value)
    {
      errno = EFAULT;
      return -1;
    }

  if (which != ITIMER_REAL && which != ITIMER_PROF)
    {
      errno = EINVAL;
      return -1;
    }

  itimer = (which == ITIMER_REAL) ? &real_itimer : &prof_itimer;

  ticks_now = w32_get_timer_time ((which == ITIMER_REAL)
				  ? NULL
				  : GetCurrentThread ());

  t_expire = &itimer->expire;
  t_reload = &itimer->reload;
  crit = (which == ITIMER_REAL) ? &crit_real : &crit_prof;

  EnterCriticalSection (crit);
  reload = *t_reload;
  expire = *t_expire;
  LeaveCriticalSection (crit);

  if (expire)
    expire -= ticks_now;

  value->it_value.tv_sec    = expire / TIMER_TICKS_PER_SEC;
  usecs =
    (expire % TIMER_TICKS_PER_SEC) * (__int64)1000000 / TIMER_TICKS_PER_SEC;
  value->it_value.tv_usec   = usecs;
  value->it_interval.tv_sec = reload / TIMER_TICKS_PER_SEC;
  usecs =
    (reload % TIMER_TICKS_PER_SEC) * (__int64)1000000 / TIMER_TICKS_PER_SEC;
  value->it_interval.tv_usec= usecs;

  return 0;
}

int
setitimer(int which, struct itimerval *value, struct itimerval *ovalue)
{
  volatile ULONGLONG *t_expire, *t_reload;
  ULONGLONG expire, reload, expire_old, reload_old;
  __int64 usecs;
  CRITICAL_SECTION *crit;
  struct itimerval tem, *ptem;

  if (disable_itimers)
    return -1;

  /* Posix systems expect timer values smaller than the resolution of
     the system clock be rounded up to the clock resolution.  First
     time we are called, measure the clock tick resolution.  */
  if (!clocks_min)
    {
      ULONGLONG t1, t2;

      for (t1 = w32_get_timer_time (NULL);
	   (t2 = w32_get_timer_time (NULL)) == t1; )
	;
      clocks_min = t2 - t1;
    }

  if (ovalue)
    ptem = ovalue;
  else
    ptem = &tem;

  if (getitimer (which, ptem)) /* also sets ticks_now */
    return -1;		       /* errno already set */

  t_expire =
    (which == ITIMER_REAL) ? &real_itimer.expire : &prof_itimer.expire;
  t_reload =
    (which == ITIMER_REAL) ? &real_itimer.reload : &prof_itimer.reload;

  crit = (which == ITIMER_REAL) ? &crit_real : &crit_prof;

  if (!value
      || (value->it_value.tv_sec == 0 && value->it_value.tv_usec == 0))
    {
      EnterCriticalSection (crit);
      /* Disable the timer.  */
      *t_expire = 0;
      *t_reload = 0;
      LeaveCriticalSection (crit);
      return 0;
    }

  reload = value->it_interval.tv_sec * TIMER_TICKS_PER_SEC;

  usecs = value->it_interval.tv_usec;
  if (value->it_interval.tv_sec == 0
      && usecs && usecs * TIMER_TICKS_PER_SEC < clocks_min * 1000000)
    reload = clocks_min;
  else
    {
      usecs *= TIMER_TICKS_PER_SEC;
      reload += usecs / 1000000;
    }

  expire = value->it_value.tv_sec * TIMER_TICKS_PER_SEC;
  usecs = value->it_value.tv_usec;
  if (value->it_value.tv_sec == 0
      && usecs * TIMER_TICKS_PER_SEC < clocks_min * 1000000)
    expire = clocks_min;
  else
    {
      usecs *= TIMER_TICKS_PER_SEC;
      expire += usecs / 1000000;
    }

  expire += ticks_now;

  EnterCriticalSection (crit);
  expire_old = *t_expire;
  reload_old = *t_reload;
  if (!(expire == expire_old && reload == reload_old))
    {
      *t_reload = reload;
      *t_expire = expire;
    }
  LeaveCriticalSection (crit);

  return start_timer_thread (which);
}

int
alarm (int seconds)
{
#ifdef HAVE_SETITIMER
  struct itimerval new_values, old_values;

  new_values.it_value.tv_sec = seconds;
  new_values.it_value.tv_usec = 0;
  new_values.it_interval.tv_sec = new_values.it_interval.tv_usec = 0;

  if (setitimer (ITIMER_REAL, &new_values, &old_values) < 0)
    return 0;
  return old_values.it_value.tv_sec;
#else
  return seconds;
#endif
}



/* Here's an overview of how support for subprocesses and
   network/serial streams is implemented on MS-Windows.

   The management of both subprocesses and network/serial streams
   circles around the child_procs[] array, which can record up to the
   grand total of MAX_CHILDREN (= 32) of these.  (The reasons for the
   32 limitation will become clear below.)  Each member of
   child_procs[] is a child_process structure, defined on w32.h.

   A related data structure is the fd_info[] array, which holds twice
   as many members, 64, and records the information about file
   descriptors used for communicating with subprocesses and
   network/serial devices.  Each member of the array is the filedesc
   structure, which records the Windows handle for communications,
   such as the read end of the pipe to a subprocess, a socket handle,
   etc.

   Both these arrays reference each other: there's a member of
   child_process structure that records the corresponding file
   descriptor, and there's a member of filedesc structure that holds a
   pointer to the corresponding child_process.

   Whenever Emacs starts a subprocess or opens a network/serial
   stream, the function new_child is called to prepare a new
   child_process structure.  new_child looks for the first vacant slot
   in the child_procs[] array, initializes it, and starts a "reader
   thread" that will watch the output of the subprocess/stream and its
   status.  (If no vacant slot can be found, new_child returns a
   failure indication to its caller, and the higher-level Emacs
   primitive that called it will then fail with EMFILE or EAGAIN.)

   The reader thread started by new_child communicates with the main
   (a.k.a. "Lisp") thread via two event objects and a status, all of
   them recorded by the members of the child_process structure in
   child_procs[].  The event objects serve as semaphores between the
   reader thread and the 'pselect' emulation in sys_select, as follows:

     . Initially, the reader thread is waiting for the char_consumed
       event to become signaled by sys_select, which is an indication
       for the reader thread to go ahead and try reading more stuff
       from the subprocess/stream.

     . The reader thread then attempts to read by calling a
       blocking-read function.  When the read call returns, either
       successfully or with some failure indication, the reader thread
       updates the status of the read accordingly, and signals the 2nd
       event object, char_avail, on whose handle sys_select is
       waiting.  This tells sys_select that the file descriptor
       allocated for the subprocess or the stream is ready to be
       read from.

   When the subprocess exits or the network/serial stream is closed,
   the reader thread sets the status accordingly and exits.  It also
   exits when the main thread sets the status to STATUS_READ_ERROR
   and/or the char_avail and char_consumed event handles become NULL;
   this is how delete_child, called by Emacs when a subprocess or a
   stream is terminated, terminates the reader thread as part of
   deleting the child_process object.

   The sys_select function emulates the Posix 'pselect' functionality;
   it is needed because the Windows 'select' function supports only
   network sockets, while Emacs expects 'pselect' to work for any file
   descriptor, including pipes and serial streams.

   When sys_select is called, it uses the information in fd_info[]
   array to convert the file descriptors which it was asked to watch
   into Windows handles.  In general, the handle to watch is the
   handle of the char_avail event of the child_process structure that
   corresponds to the file descriptor.  In addition, for subprocesses,
   sys_select watches one more handle: the handle for the subprocess,
   so that it could emulate the SIGCHLD signal when the subprocess
   exits.

   If file descriptor zero (stdin) doesn't have its bit set in the
   'rfds' argument to sys_select, the function always watches for
   keyboard interrupts, to be able to interrupt the wait and return
   when the user presses C-g.

   Having collected the handles to watch, sys_select calls
   WaitForMultipleObjects to wait for any one of them to become
   signaled.  Since WaitForMultipleObjects can only watch up to 64
   handles, Emacs on Windows is limited to maximum 32 child_process
   objects (since a subprocess consumes 2 handles to be watched, see
   above).

   When any of the handles become signaled, sys_select does whatever
   is appropriate for the corresponding child_process object:

     . If it's a handle to the char_avail event, sys_select marks the
       corresponding bit in 'rfds', and Emacs will then read from that
       file descriptor.

     . If it's a handle to the process, sys_select calls the SIGCHLD
       handler, to inform Emacs of the fact that the subprocess
       exited.

   The waitpid emulation works very similar to sys_select, except that
   it only watches handles of subprocesses, and doesn't synchronize
   with the reader thread.

   Because socket descriptors on Windows are handles, while Emacs
   expects them to be file descriptors, all low-level I/O functions,
   such as 'read' and 'write', and all socket operations, like
   'connect', 'recvfrom', 'accept', etc., are redirected to the
   corresponding 'sys_*' functions, which must convert a file
   descriptor to a handle using the fd_info[] array, and then invoke
   the corresponding Windows API on the handle.  Most of these
   redirected 'sys_*' functions are implemented on w32.c.

   When the file descriptor was produced by functions such as 'open',
   the corresponding handle is obtained by calling _get_osfhandle.  To
   produce a file descriptor for a socket handle, which has no file
   descriptor as far as Windows is concerned, the function
   socket_to_fd opens the null device; the resulting file descriptor
   will never be used directly in any I/O API, but serves as an index
   into the fd_info[] array, where the socket handle is stored.  The
   SOCK_HANDLE macro retrieves the handle when given the file
   descriptor.

   The function sys_kill emulates the Posix 'kill' functionality to
   terminate other processes.  It does that by attaching to the
   foreground window of the process and sending a Ctrl-C or Ctrl-BREAK
   signal to the process; if that doesn't work, then it calls
   TerminateProcess to forcibly terminate the process.  Note that this
   only terminates the immediate process whose PID was passed to
   sys_kill; it doesn't terminate the child processes of that process.
   This means, for example, that an Emacs subprocess run through a
   shell might not be killed, because sys_kill will only terminate the
   shell.  (In practice, however, such problems are very rare.)  */

/* Defined in <process.h> which conflicts with the local copy */
#define _P_NOWAIT 1

/* Child process management list.  */
int child_proc_count = 0;
child_process child_procs[ MAX_CHILDREN ];

static DWORD WINAPI reader_thread (void *arg);

/* Find an unused process slot.  */
child_process *
new_child (void)
{
  child_process *cp;
  DWORD id;

  for (cp = child_procs + (child_proc_count-1); cp >= child_procs; cp--)
    if (!CHILD_ACTIVE (cp) && cp->procinfo.hProcess == NULL)
      goto Initialize;
  if (child_proc_count == MAX_CHILDREN)
    {
      int i = 0;
      child_process *dead_cp = NULL;

      DebPrint (("new_child: No vacant slots, looking for dead processes\n"));
      for (cp = child_procs + (child_proc_count-1); cp >= child_procs; cp--)
	if (!CHILD_ACTIVE (cp) && cp->procinfo.hProcess)
	  {
	    DWORD status = 0;

	    if (!GetExitCodeProcess (cp->procinfo.hProcess, &status))
	      {
		DebPrint (("new_child.GetExitCodeProcess: error %lu for PID %lu\n",
			   GetLastError (), cp->procinfo.dwProcessId));
		status = STILL_ACTIVE;
	      }
	    if (status != STILL_ACTIVE
		|| WaitForSingleObject (cp->procinfo.hProcess, 0) == WAIT_OBJECT_0)
	      {
		DebPrint (("new_child: Freeing slot of dead process %d, fd %d\n",
			   cp->procinfo.dwProcessId, cp->fd));
		CloseHandle (cp->procinfo.hProcess);
		cp->procinfo.hProcess = NULL;
		CloseHandle (cp->procinfo.hThread);
		cp->procinfo.hThread = NULL;
		/* Free up to 2 dead slots at a time, so that if we
		   have a lot of them, they will eventually all be
		   freed when the tornado ends.  */
		if (i == 0)
		  dead_cp = cp;
		else
		  break;
		i++;
	      }
	  }
      if (dead_cp)
	{
	  cp = dead_cp;
	  goto Initialize;
	}
    }
  if (child_proc_count == MAX_CHILDREN)
    return NULL;
  cp = &child_procs[child_proc_count++];

 Initialize:
  /* Last opportunity to avoid leaking handles before we forget them
     for good.  */
  if (cp->procinfo.hProcess)
    CloseHandle (cp->procinfo.hProcess);
  if (cp->procinfo.hThread)
    CloseHandle (cp->procinfo.hThread);
  memset (cp, 0, sizeof (*cp));
  cp->fd = -1;
  cp->pid = -1;
  cp->procinfo.hProcess = NULL;
  cp->status = STATUS_READ_ERROR;

  /* use manual reset event so that select() will function properly */
  cp->char_avail = CreateEvent (NULL, TRUE, FALSE, NULL);
  if (cp->char_avail)
    {
      cp->char_consumed = CreateEvent (NULL, FALSE, FALSE, NULL);
      if (cp->char_consumed)
        {
	  /* The 0x00010000 flag is STACK_SIZE_PARAM_IS_A_RESERVATION.
	     It means that the 64K stack we are requesting in the 2nd
	     argument is how much memory should be reserved for the
	     stack.  If we don't use this flag, the memory requested
	     by the 2nd argument is the amount actually _committed_,
	     but Windows reserves 8MB of memory for each thread's
	     stack.  (The 8MB figure comes from the -stack
	     command-line argument we pass to the linker when building
	     Emacs, but that's because we need a large stack for
	     Emacs's main thread.)  Since we request 2GB of reserved
	     memory at startup (see w32heap.c), which is close to the
	     maximum memory available for a 32-bit process on Windows,
	     the 8MB reservation for each thread causes failures in
	     starting subprocesses, because we create a thread running
	     reader_thread for each subprocess.  As 8MB of stack is
	     way too much for reader_thread, forcing Windows to
	     reserve less wins the day.  */
	  cp->thrd = CreateThread (NULL, 64 * 1024, reader_thread, cp,
				   0x00010000, &id);
	  if (cp->thrd)
	    return cp;
	}
    }
  delete_child (cp);
  return NULL;
}

void
delete_child (child_process *cp)
{
  int i;

  /* Should not be deleting a child that is still needed. */
  for (i = 0; i < MAXDESC; i++)
    if (fd_info[i].cp == cp)
      emacs_abort ();

  if (!CHILD_ACTIVE (cp) && cp->procinfo.hProcess == NULL)
    return;

  /* reap thread if necessary */
  if (cp->thrd)
    {
      DWORD rc;

      if (GetExitCodeThread (cp->thrd, &rc) && rc == STILL_ACTIVE)
        {
	  /* let the thread exit cleanly if possible */
	  cp->status = STATUS_READ_ERROR;
	  SetEvent (cp->char_consumed);
#if 0
          /* We used to forcibly terminate the thread here, but it
             is normally unnecessary, and in abnormal cases, the worst that
             will happen is we have an extra idle thread hanging around
             waiting for the zombie process.  */
	  if (WaitForSingleObject (cp->thrd, 1000) != WAIT_OBJECT_0)
	    {
	      DebPrint (("delete_child.WaitForSingleObject (thread) failed "
			 "with %lu for fd %ld\n", GetLastError (), cp->fd));
	      TerminateThread (cp->thrd, 0);
	    }
#endif
	}
      CloseHandle (cp->thrd);
      cp->thrd = NULL;
    }
  if (cp->char_avail)
    {
      CloseHandle (cp->char_avail);
      cp->char_avail = NULL;
    }
  if (cp->char_consumed)
    {
      CloseHandle (cp->char_consumed);
      cp->char_consumed = NULL;
    }

  /* update child_proc_count (highest numbered slot in use plus one) */
  if (cp == child_procs + child_proc_count - 1)
    {
      for (i = child_proc_count-1; i >= 0; i--)
	if (CHILD_ACTIVE (&child_procs[i])
	    || child_procs[i].procinfo.hProcess != NULL)
	  {
	    child_proc_count = i + 1;
	    break;
	  }
    }
  if (i < 0)
    child_proc_count = 0;
}

/* Find a child by pid.  */
static child_process *
find_child_pid (DWORD pid)
{
  child_process *cp;

  for (cp = child_procs + (child_proc_count-1); cp >= child_procs; cp--)
    if ((CHILD_ACTIVE (cp) || cp->procinfo.hProcess != NULL)
	&& pid == cp->pid)
      return cp;
  return NULL;
}

void
release_listen_threads (void)
{
  int i;

  for (i = child_proc_count - 1; i >= 0; i--)
    {
      if (CHILD_ACTIVE (&child_procs[i])
	  && (fd_info[child_procs[i].fd].flags & FILE_LISTEN))
	child_procs[i].status = STATUS_READ_ERROR;
    }
}

/* Thread proc for child process and socket reader threads. Each thread
   is normally blocked until woken by select() to check for input by
   reading one char.  When the read completes, char_avail is signaled
   to wake up the select emulator and the thread blocks itself again. */
static DWORD WINAPI
reader_thread (void *arg)
{
  child_process *cp;

  /* Our identity */
  cp = (child_process *)arg;

  /* We have to wait for the go-ahead before we can start */
  if (cp == NULL
      || WaitForSingleObject (cp->char_consumed, INFINITE) != WAIT_OBJECT_0
      || cp->fd < 0)
    return 1;

  for (;;)
    {
      int rc;

      if (cp->fd >= 0 && (fd_info[cp->fd].flags & FILE_CONNECT) != 0)
	rc = _sys_wait_connect (cp->fd);
      else if (cp->fd >= 0 && (fd_info[cp->fd].flags & FILE_LISTEN) != 0)
	rc = _sys_wait_accept (cp->fd);
      else
	rc = _sys_read_ahead (cp->fd);

      /* Don't bother waiting for the event if we already have been
	 told to exit by delete_child.  */
      if (cp->status == STATUS_READ_ERROR || !cp->char_avail)
	break;

      /* The name char_avail is a misnomer - it really just means the
	 read-ahead has completed, whether successfully or not. */
      if (!SetEvent (cp->char_avail))
        {
	  DebPrint (("reader_thread.SetEvent(0x%x) failed with %lu for fd %ld (PID %d)\n",
		     (DWORD_PTR)cp->char_avail, GetLastError (),
		     cp->fd, cp->pid));
	  return 1;
	}

      if (rc == STATUS_READ_ERROR || rc == STATUS_CONNECT_FAILED)
	return 2;

      /* If the read died, the child has died so let the thread die */
      if (rc == STATUS_READ_FAILED)
	break;

      /* Don't bother waiting for the acknowledge if we already have
	 been told to exit by delete_child.  */
      if (cp->status == STATUS_READ_ERROR || !cp->char_consumed)
	break;

      /* Wait until our input is acknowledged before reading again */
      if (WaitForSingleObject (cp->char_consumed, INFINITE) != WAIT_OBJECT_0)
        {
	  DebPrint (("reader_thread.WaitForSingleObject failed with "
		     "%lu for fd %ld\n", GetLastError (), cp->fd));
	  break;
        }
      /* delete_child sets status to STATUS_READ_ERROR when it wants
	 us to exit.  */
      if (cp->status == STATUS_READ_ERROR)
	break;
    }
  return 0;
}

/* To avoid Emacs changing directory, we just record here the
   directory the new process should start in.  This is set just before
   calling sys_spawnve, and is not generally valid at any other time.
   Note that this directory's name is UTF-8 encoded.  */
static char * process_dir;

static BOOL
create_child (char *exe, char *cmdline, char *env, int is_gui_app,
	      pid_t * pPid, child_process *cp)
{
  STARTUPINFO start;
  SECURITY_ATTRIBUTES sec_attrs;
#if 0
  SECURITY_DESCRIPTOR sec_desc;
#endif
  DWORD flags;
  char dir[ MAX_PATH ];
  char *p;
  const char *ext;

  if (cp == NULL) emacs_abort ();

  memset (&start, 0, sizeof (start));
  start.cb = sizeof (start);

#ifdef HAVE_NTGUI
  if (NILP (Vw32_start_process_show_window) && !is_gui_app)
    start.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
  else
    start.dwFlags = STARTF_USESTDHANDLES;
  start.wShowWindow = SW_HIDE;

  start.hStdInput = GetStdHandle (STD_INPUT_HANDLE);
  start.hStdOutput = GetStdHandle (STD_OUTPUT_HANDLE);
  start.hStdError = GetStdHandle (STD_ERROR_HANDLE);
#endif /* HAVE_NTGUI */

#if 0
  /* Explicitly specify no security */
  if (!InitializeSecurityDescriptor (&sec_desc, SECURITY_DESCRIPTOR_REVISION))
    goto EH_Fail;
  if (!SetSecurityDescriptorDacl (&sec_desc, TRUE, NULL, FALSE))
    goto EH_Fail;
#endif
  sec_attrs.nLength = sizeof (sec_attrs);
  sec_attrs.lpSecurityDescriptor = NULL /* &sec_desc */;
  sec_attrs.bInheritHandle = FALSE;

  filename_to_ansi (process_dir, dir);
  /* Can't use unixtodos_filename here, since that needs its file name
     argument encoded in UTF-8.  OTOH, process_dir, which _is_ in
     UTF-8, points, to the directory computed by our caller, and we
     don't want to modify that, either.  */
  for (p = dir; *p; p = CharNextA (p))
    if (*p == '/')
      *p = '\\';

  /* CreateProcess handles batch files as exe specially.  This special
     handling fails when both the batch file and arguments are quoted.
     We pass NULL as exe to avoid the special handling. */
  if (exe && cmdline[0] == '"' &&
      (ext = strrchr (exe, '.')) &&
      (xstrcasecmp (ext, ".bat") == 0
       || xstrcasecmp (ext, ".cmd") == 0))
      exe = NULL;

  flags = (!NILP (Vw32_start_process_share_console)
	   ? CREATE_NEW_PROCESS_GROUP
	   : CREATE_NEW_CONSOLE);
  if (NILP (Vw32_start_process_inherit_error_mode))
    flags |= CREATE_DEFAULT_ERROR_MODE;
  if (!CreateProcessA (exe, cmdline, &sec_attrs, NULL, TRUE,
		       flags, env, dir, &start, &cp->procinfo))
    goto EH_Fail;

  cp->pid = (int) cp->procinfo.dwProcessId;

  /* Hack for Windows 95, which assigns large (ie negative) pids */
  if (cp->pid < 0)
    cp->pid = -cp->pid;

  *pPid = cp->pid;

  return TRUE;

 EH_Fail:
  DebPrint (("create_child.CreateProcess failed: %ld\n", GetLastError ()););
  return FALSE;
}

/* create_child doesn't know what emacs's file handle will be for waiting
   on output from the child, so we need to make this additional call
   to register the handle with the process
   This way the select emulator knows how to match file handles with
   entries in child_procs.  */
void
register_child (pid_t pid, int fd)
{
  child_process *cp;

  cp = find_child_pid ((DWORD)pid);
  if (cp == NULL)
    {
      DebPrint (("register_child unable to find pid %lu\n", pid));
      return;
    }

#ifdef FULL_DEBUG
  DebPrint (("register_child registered fd %d with pid %lu\n", fd, pid));
#endif

  cp->fd = fd;

  /* thread is initially blocked until select is called; set status so
     that select will release thread */
  cp->status = STATUS_READ_ACKNOWLEDGED;

  /* attach child_process to fd_info */
  if (fd_info[fd].cp != NULL)
    {
      DebPrint (("register_child: fd_info[%d] apparently in use!\n", fd));
      emacs_abort ();
    }

  fd_info[fd].cp = cp;
}

/* Called from waitpid when a process exits.  */
static void
reap_subprocess (child_process *cp)
{
  if (cp->procinfo.hProcess)
    {
      /* Reap the process */
#ifdef FULL_DEBUG
      /* Process should have already died before we are called.  */
      if (WaitForSingleObject (cp->procinfo.hProcess, 0) != WAIT_OBJECT_0)
	DebPrint (("reap_subprocess: child for fd %d has not died yet!", cp->fd));
#endif
      CloseHandle (cp->procinfo.hProcess);
      cp->procinfo.hProcess = NULL;
      CloseHandle (cp->procinfo.hThread);
      cp->procinfo.hThread = NULL;
    }

  /* If cp->fd was not closed yet, we might be still reading the
     process output, so don't free its resources just yet.  The call
     to delete_child on behalf of this subprocess will be made by
     sys_read when the subprocess output is fully read.  */
  if (cp->fd < 0)
    delete_child (cp);
}

/* Wait for a child process specified by PID, or for any of our
   existing child processes (if PID is nonpositive) to die.  When it
   does, close its handle.  Return the pid of the process that died
   and fill in STATUS if non-NULL.  */

pid_t
waitpid (pid_t pid, int *status, int options)
{
  DWORD active, retval;
  int nh;
  child_process *cp, *cps[MAX_CHILDREN];
  HANDLE wait_hnd[MAX_CHILDREN];
  DWORD timeout_ms;
  int dont_wait = (options & WNOHANG) != 0;

  nh = 0;
  /* According to Posix:

     PID = -1 means status is requested for any child process.

     PID > 0 means status is requested for a single child process
     whose pid is PID.

     PID = 0 means status is requested for any child process whose
     process group ID is equal to that of the calling process.  But
     since Windows has only a limited support for process groups (only
     for console processes and only for the purposes of passing
     Ctrl-BREAK signal to them), and since we have no documented way
     of determining whether a given process belongs to our group, we
     treat 0 as -1.

     PID < -1 means status is requested for any child process whose
     process group ID is equal to the absolute value of PID.  Again,
     since we don't support process groups, we treat that as -1.  */
  if (pid > 0)
    {
      int our_child = 0;

      /* We are requested to wait for a specific child.  */
      for (cp = child_procs + (child_proc_count-1); cp >= child_procs; cp--)
	{
	  /* Some child_procs might be sockets; ignore them.  Also
	     ignore subprocesses whose output is not yet completely
	     read.  */
	  if (CHILD_ACTIVE (cp)
	      && cp->procinfo.hProcess
	      && cp->pid == pid)
	    {
	      our_child = 1;
	      break;
	    }
	}
      if (our_child)
	{
	  if (cp->fd < 0 || (fd_info[cp->fd].flags & FILE_AT_EOF) != 0)
	    {
	      wait_hnd[nh] = cp->procinfo.hProcess;
	      cps[nh] = cp;
	      nh++;
	    }
	  else if (dont_wait)
	    {
	      /* PID specifies our subprocess, but its status is not
		 yet available.  */
	      return 0;
	    }
	}
      if (nh == 0)
	{
	  /* No such child process, or nothing to wait for, so fail.  */
	  errno = ECHILD;
	  return -1;
	}
    }
  else
    {
      for (cp = child_procs + (child_proc_count-1); cp >= child_procs; cp--)
	{
	  if (CHILD_ACTIVE (cp)
	      && cp->procinfo.hProcess
	      && (cp->fd < 0 || (fd_info[cp->fd].flags & FILE_AT_EOF) != 0))
	    {
	      wait_hnd[nh] = cp->procinfo.hProcess;
	      cps[nh] = cp;
	      nh++;
	    }
	}
      if (nh == 0)
	{
	  /* Nothing to wait on, so fail.  */
	  errno = ECHILD;
	  return -1;
	}
    }

  if (dont_wait)
    timeout_ms = 0;
  else
    timeout_ms = 1000;	/* check for quit about once a second. */

  do
    {
      /* When child_status_changed calls us with WNOHANG in OPTIONS,
	 we are supposed to be non-interruptible, so don't allow
	 quitting in that case.  */
      if (!dont_wait)
	maybe_quit ();
      active = WaitForMultipleObjects (nh, wait_hnd, FALSE, timeout_ms);
    } while (active == WAIT_TIMEOUT && !dont_wait);

  if (active == WAIT_FAILED)
    {
      errno = EBADF;
      return -1;
    }
  else if (active == WAIT_TIMEOUT && dont_wait)
    {
      /* PID specifies our subprocess, but it didn't exit yet, so its
	 status is not yet available.  */
#ifdef FULL_DEBUG
      DebPrint (("Wait: PID %d not reap yet\n", cp->pid));
#endif
      return 0;
    }
  else if (active >= WAIT_OBJECT_0
	   && active < WAIT_OBJECT_0+MAXIMUM_WAIT_OBJECTS)
    {
      active -= WAIT_OBJECT_0;
    }
  else if (active >= WAIT_ABANDONED_0
	   && active < WAIT_ABANDONED_0+MAXIMUM_WAIT_OBJECTS)
    {
      active -= WAIT_ABANDONED_0;
    }
  else
    emacs_abort ();

  if (!GetExitCodeProcess (wait_hnd[active], &retval))
    {
      DebPrint (("Wait.GetExitCodeProcess failed with %lu\n",
		 GetLastError ()));
      retval = 1;
    }
  if (retval == STILL_ACTIVE)
    {
      /* Should never happen.  But it does, with invoking git-gui.exe
	 asynchronously.  So we punt, and just report this process as
	 exited with exit code 259, when we are called with WNOHANG
	 from child_status_changed, because in that case we already
	 _know_ the process has died.  */
      DebPrint (("Wait.WaitForMultipleObjects returned an active process\n"));
      if (!(pid > 0 && dont_wait))
	{
	  errno = EINVAL;
	  return -1;
	}
    }

  /* Massage the exit code from the process to match the format expected
     by the WIFSTOPPED et al macros in syswait.h.  Only WIFSIGNALED and
     WIFEXITED are supported; WIFSTOPPED doesn't make sense under NT.  */

  if (retval == STATUS_CONTROL_C_EXIT)
    retval = SIGINT;
  else
    retval <<= 8;

  if (pid > 0 && active != 0)
    emacs_abort ();
  cp = cps[active];
  pid = cp->pid;
#ifdef FULL_DEBUG
  DebPrint (("Wait signaled with process pid %d\n", cp->pid));
#endif

  if (status)
    *status = retval;
  reap_subprocess (cp);

  return pid;
}

/* Old versions of w32api headers don't have separate 32-bit and
   64-bit defines, but the one they have matches the 32-bit variety.  */
#ifndef IMAGE_NT_OPTIONAL_HDR32_MAGIC
# define IMAGE_NT_OPTIONAL_HDR32_MAGIC IMAGE_NT_OPTIONAL_HDR_MAGIC
# define IMAGE_OPTIONAL_HEADER32 IMAGE_OPTIONAL_HEADER
#endif

/* Implementation note: This function works with file names encoded in
   the current ANSI codepage.  */
static int
w32_executable_type (char * filename,
		     int * is_dos_app,
		     int * is_cygnus_app,
		     int * is_msys_app,
		     int * is_gui_app)
{
  file_data executable;
  char * p;
  int retval = 0;

  /* Default values in case we can't tell for sure.  */
  *is_dos_app = FALSE;
  *is_cygnus_app = FALSE;
  *is_msys_app = FALSE;
  *is_gui_app = FALSE;

  if (!open_input_file (&executable, filename))
    return -1;

  p = strrchr (filename, '.');

  /* We can only identify DOS .com programs from the extension. */
  if (p && xstrcasecmp (p, ".com") == 0)
    *is_dos_app = TRUE;
  else if (p && (xstrcasecmp (p, ".bat") == 0
		 || xstrcasecmp (p, ".cmd") == 0))
    {
      /* A DOS shell script - it appears that CreateProcess is happy to
	 accept this (somewhat surprisingly); presumably it looks at
	 COMSPEC to determine what executable to actually invoke.
	 Therefore, we have to do the same here as well. */
      /* Actually, I think it uses the program association for that
	 extension, which is defined in the registry.  */
      p = egetenv ("COMSPEC");
      if (p)
	retval = w32_executable_type (p, is_dos_app, is_cygnus_app, is_msys_app,
				      is_gui_app);
    }
  else
    {
      /* Look for DOS .exe signature - if found, we must also check that
	 it isn't really a 16- or 32-bit Windows exe, since both formats
	 start with a DOS program stub.  Note that 16-bit Windows
	 executables use the OS/2 1.x format. */

      IMAGE_DOS_HEADER * dos_header;
      IMAGE_NT_HEADERS * nt_header;

      dos_header = (PIMAGE_DOS_HEADER) executable.file_base;
      if (dos_header->e_magic != IMAGE_DOS_SIGNATURE)
	goto unwind;

      nt_header = (PIMAGE_NT_HEADERS) ((unsigned char *) dos_header + dos_header->e_lfanew);

      if ((char *) nt_header > (char *) dos_header + executable.size)
	{
	  /* Some dos headers (pkunzip) have bogus e_lfanew fields.  */
	  *is_dos_app = TRUE;
	}
      else if (nt_header->Signature != IMAGE_NT_SIGNATURE
	       && LOWORD (nt_header->Signature) != IMAGE_OS2_SIGNATURE)
  	{
	  *is_dos_app = TRUE;
  	}
      else if (nt_header->Signature == IMAGE_NT_SIGNATURE)
  	{
          IMAGE_DATA_DIRECTORY *data_dir = NULL;
          if (nt_header->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR32_MAGIC)
            {
              /* Ensure we are using the 32 bit structure.  */
              IMAGE_OPTIONAL_HEADER32 *opt
                = (IMAGE_OPTIONAL_HEADER32*) &(nt_header->OptionalHeader);
              data_dir = opt->DataDirectory;
              *is_gui_app = (opt->Subsystem == IMAGE_SUBSYSTEM_WINDOWS_GUI);
            }
          /* MingW 3.12 has the required 64 bit structs, but in case older
             versions don't, only check 64 bit exes if we know how.  */
#ifdef IMAGE_NT_OPTIONAL_HDR64_MAGIC
          else if (nt_header->OptionalHeader.Magic
                   == IMAGE_NT_OPTIONAL_HDR64_MAGIC)
            {
              IMAGE_OPTIONAL_HEADER64 *opt
                = (IMAGE_OPTIONAL_HEADER64*) &(nt_header->OptionalHeader);
              data_dir = opt->DataDirectory;
              *is_gui_app = (opt->Subsystem == IMAGE_SUBSYSTEM_WINDOWS_GUI);
            }
#endif
          if (data_dir)
            {
              /* Look for Cygwin DLL in the DLL import list. */
              IMAGE_DATA_DIRECTORY import_dir =
                data_dir[IMAGE_DIRECTORY_ENTRY_IMPORT];

	      /* Import directory can be missing in .NET DLLs.  */
	      if (import_dir.VirtualAddress != 0)
		{
		  IMAGE_IMPORT_DESCRIPTOR * imports =
		    RVA_TO_PTR (import_dir.VirtualAddress,
				rva_to_section (import_dir.VirtualAddress,
						nt_header),
				executable);

		  for ( ; imports->Name; imports++)
		    {
		      IMAGE_SECTION_HEADER * section =
			rva_to_section (imports->Name, nt_header);
		      char * dllname = RVA_TO_PTR (imports->Name, section,
						   executable);

		      /* The exact name of the Cygwin DLL has changed with
			 various releases, but hopefully this will be
			 reasonably future-proof.  */
		      if (strncmp (dllname, "cygwin", 6) == 0)
			{
			  *is_cygnus_app = TRUE;
			  break;
			}
		      else if (strncmp (dllname, "msys-", 5) == 0)
			{
			  /* This catches both MSYS 1.x and MSYS2
			     executables (the DLL name is msys-1.0.dll and
			     msys-2.0.dll, respectively).  There doesn't
			     seem to be a reason to distinguish between
			     the two, for now.  */
			  *is_msys_app = TRUE;
			  break;
			}
		    }
		}
            }
  	}
    }

unwind:
  close_file_data (&executable);
  return retval;
}

static int
compare_env (const void *strp1, const void *strp2)
{
  const char *str1 = *(const char **)strp1, *str2 = *(const char **)strp2;

  while (*str1 && *str2 && *str1 != '=' && *str2 != '=')
    {
      /* Sort order in command.com/cmd.exe is based on uppercasing
         names, so do the same here.  */
      if (toupper (*str1) > toupper (*str2))
	return 1;
      else if (toupper (*str1) < toupper (*str2))
	return -1;
      str1++, str2++;
    }

  if (*str1 == '=' && *str2 == '=')
    return 0;
  else if (*str1 == '=')
    return -1;
  else
    return 1;
}

static void
merge_and_sort_env (char **envp1, char **envp2, char **new_envp)
{
  char **optr, **nptr;
  int num;

  nptr = new_envp;
  optr = envp1;
  while (*optr)
    *nptr++ = *optr++;
  num = optr - envp1;

  optr = envp2;
  while (*optr)
    *nptr++ = *optr++;
  num += optr - envp2;

  qsort (new_envp, num, sizeof (char *), compare_env);

  *nptr = NULL;
}

/* When a new child process is created we need to register it in our list,
   so intercept spawn requests.  */
int
sys_spawnve (int mode, char *cmdname, char **argv, char **envp)
{
  Lisp_Object program, full;
  char *cmdline, *env, *parg, **targ;
  int arglen, numenv;
  pid_t pid;
  child_process *cp;
  int is_dos_app, is_cygnus_app, is_msys_app, is_gui_app;
  int do_quoting = 0;
  /* We pass our process ID to our children by setting up an environment
     variable in their environment.  */
  char ppid_env_var_buffer[64];
  char *extra_env[] = {ppid_env_var_buffer, NULL};
  /* These are the characters that cause an argument to need quoting.
     Arguments with whitespace characters need quoting to prevent the
     argument being split into two or more. Arguments with wildcards
     are also quoted, for consistency with posix platforms, where wildcards
     are not expanded if we run the program directly without a shell.
     Some extra whitespace characters need quoting in Cygwin/MSYS programs,
     so this list is conditionally modified below.  */
  const char *sepchars = " \t*?";
  /* This is for native w32 apps; modified below for Cygwin/MSUS apps.  */
  char escape_char = '\\';
  char cmdname_a[MAX_PATH];

  /* We don't care about the other modes */
  if (mode != _P_NOWAIT)
    {
      errno = EINVAL;
      return -1;
    }

  /* Handle executable names without an executable suffix.  The caller
     already searched exec-path and verified the file is executable,
     but start-process doesn't do that for file names that are already
     absolute.  So we double-check this here, just in case.  */
  if (faccessat (AT_FDCWD, cmdname, X_OK, AT_EACCESS) != 0)
    {
      program = build_string (cmdname);
      full = Qnil;
      openp (Vexec_path, program, Vexec_suffixes, &full, make_number (X_OK), 0);
      if (NILP (full))
	{
	  errno = EINVAL;
	  return -1;
	}
      program = ENCODE_FILE (full);
      cmdname = SSDATA (program);
    }
  else
    {
      char *p = alloca (strlen (cmdname) + 1);

      /* Don't change the command name we were passed by our caller
	 (unixtodos_filename below will destructively mirror forward
	 slashes).  */
      cmdname = strcpy (p, cmdname);
    }

  /* make sure argv[0] and cmdname are both in DOS format */
  unixtodos_filename (cmdname);
  /* argv[0] was encoded by caller using ENCODE_FILE, so it is in
     UTF-8.  All the other arguments are encoded by ENCODE_SYSTEM or
     some such, and are in some ANSI codepage.  We need to have
     argv[0] encoded in ANSI codepage.  */
  filename_to_ansi (cmdname, cmdname_a);
  /* We explicitly require that the command's file name be encodable
     in the current ANSI codepage, because we will be invoking it via
     the ANSI APIs.  */
  if (_mbspbrk ((unsigned char *)cmdname_a, (const unsigned char *)"?"))
    {
      errno = ENOENT;
      return -1;
    }
  /* From here on, CMDNAME is an ANSI-encoded string.  */
  cmdname = cmdname_a;
  argv[0] = cmdname;

  /* Determine whether program is a 16-bit DOS executable, or a 32-bit
     Windows executable that is implicitly linked to the Cygnus or
     MSYS dll (implying it was compiled with the Cygnus/MSYS GNU
     toolchain and hence relies on cygwin.dll or MSYS DLL to parse the
     command line - we use this to decide how to escape quote chars in
     command line args that must be quoted).

     Also determine whether it is a GUI app, so that we don't hide its
     initial window unless specifically requested.  */
  w32_executable_type (cmdname, &is_dos_app, &is_cygnus_app, &is_msys_app,
		       &is_gui_app);

  /* On Windows 95, if cmdname is a DOS app, we invoke a helper
     application to start it by specifying the helper app as cmdname,
     while leaving the real app name as argv[0].  */
  if (is_dos_app)
    {
      char *p;

      cmdname = alloca (MAX_PATH);
      if (egetenv ("CMDPROXY"))
	{
	  /* Implementation note: since process-environment, where
	     'egetenv' looks, is encoded in the system codepage, we
	     don't need to encode the cmdproxy file name if we get it
	     from the environment.  */
	  strcpy (cmdname, egetenv ("CMDPROXY"));
	}
      else
	{
	  char *q = lispstpcpy (cmdname,
				/* exec-directory needs to be encoded.  */
				ansi_encode_filename (Vexec_directory));
	  /* If we are run from the source tree, use cmdproxy.exe from
	     the same source tree.  */
	  for (p = q - 2; p > cmdname; p = CharPrevA (cmdname, p))
	    if (*p == '/')
	      break;
	  if (*p == '/' && xstrcasecmp (p, "/lib-src/") == 0)
	    q = stpcpy (p, "/nt/");
	  strcpy (q, "cmdproxy.exe");
	}

      /* Can't use unixtodos_filename here, since that needs its file
	 name argument encoded in UTF-8.  */
      for (p = cmdname; *p; p = CharNextA (p))
	if (*p == '/')
	  *p = '\\';
    }

  /* we have to do some conjuring here to put argv and envp into the
     form CreateProcess wants...  argv needs to be a space separated/null
     terminated list of parameters, and envp is a null
     separated/double-null terminated list of parameters.

     Additionally, zero-length args and args containing whitespace or
     quote chars need to be wrapped in double quotes - for this to work,
     embedded quotes need to be escaped as well.  The aim is to ensure
     the child process reconstructs the argv array we start with
     exactly, so we treat quotes at the beginning and end of arguments
     as embedded quotes.

     The w32 GNU-based library from Cygnus doubles quotes to escape
     them, while MSVC uses backslash for escaping.  (Actually the MSVC
     startup code does attempt to recognize doubled quotes and accept
     them, but gets it wrong and ends up requiring three quotes to get a
     single embedded quote!)  So by default we decide whether to use
     quote or backslash as the escape character based on whether the
     binary is apparently a Cygnus compiled app.

     Note that using backslash to escape embedded quotes requires
     additional special handling if an embedded quote is already
     preceded by backslash, or if an arg requiring quoting ends with
     backslash.  In such cases, the run of escape characters needs to be
     doubled.  For consistency, we apply this special handling as long
     as the escape character is not quote.

     Since we have no idea how large argv and envp are likely to be we
     figure out list lengths on the fly and allocate them.  */

  if (!NILP (Vw32_quote_process_args))
    {
      do_quoting = 1;
      /* Override escape char by binding w32-quote-process-args to
	 desired character, or use t for auto-selection.  */
      if (INTEGERP (Vw32_quote_process_args))
	escape_char = XINT (Vw32_quote_process_args);
      else
	escape_char = (is_cygnus_app || is_msys_app) ? '"' : '\\';
    }

  /* Cygwin/MSYS apps need quoting a bit more often.  */
  if (escape_char == '"')
    sepchars = "\r\n\t\f '";

  /* do argv...  */
  arglen = 0;
  targ = argv;
  while (*targ)
    {
      char * p = *targ;
      int need_quotes = 0;
      int escape_char_run = 0;

      if (*p == 0)
	need_quotes = 1;
      for ( ; *p; p++)
	{
	  if (escape_char == '"' && *p == '\\')
	    /* If it's a Cygwin/MSYS app, \ needs to be escaped.  */
	    arglen++;
	  else if (*p == '"')
	    {
	      /* allow for embedded quotes to be escaped */
	      arglen++;
	      need_quotes = 1;
	      /* handle the case where the embedded quote is already escaped */
	      if (escape_char_run > 0)
		{
		  /* To preserve the arg exactly, we need to double the
		     preceding escape characters (plus adding one to
		     escape the quote character itself).  */
		  arglen += escape_char_run;
		}
	    }
	  else if (strchr (sepchars, *p) != NULL)
	    {
	      need_quotes = 1;
	    }

	  if (*p == escape_char && escape_char != '"')
	    escape_char_run++;
	  else
	    escape_char_run = 0;
	}
      if (need_quotes)
	{
	  arglen += 2;
	  /* handle the case where the arg ends with an escape char - we
	     must not let the enclosing quote be escaped.  */
	  if (escape_char_run > 0)
	    arglen += escape_char_run;
	}
      arglen += strlen (*targ++) + 1;
    }
  cmdline = alloca (arglen);
  targ = argv;
  parg = cmdline;
  while (*targ)
    {
      char * p = *targ;
      int need_quotes = 0;

      if (*p == 0)
	need_quotes = 1;

      if (do_quoting)
	{
	  for ( ; *p; p++)
	    if ((strchr (sepchars, *p) != NULL) || *p == '"')
	      need_quotes = 1;
	}
      if (need_quotes)
	{
	  int escape_char_run = 0;
	  /* char * first; */
	  /* char * last; */

	  p = *targ;
	  /* first = p; */
	  /* last = p + strlen (p) - 1; */
	  *parg++ = '"';
#if 0
	  /* This version does not escape quotes if they occur at the
	     beginning or end of the arg - this could lead to incorrect
	     behavior when the arg itself represents a command line
	     containing quoted args.  I believe this was originally done
	     as a hack to make some things work, before
	     `w32-quote-process-args' was added.  */
	  while (*p)
	    {
	      if (*p == '"' && p > first && p < last)
		*parg++ = escape_char;	/* escape embedded quotes */
	      *parg++ = *p++;
	    }
#else
	  for ( ; *p; p++)
	    {
	      if (*p == '"')
		{
		  /* double preceding escape chars if any */
		  while (escape_char_run > 0)
		    {
		      *parg++ = escape_char;
		      escape_char_run--;
		    }
		  /* escape all quote chars, even at beginning or end */
		  *parg++ = escape_char;
		}
	      else if (escape_char == '"' && *p == '\\')
		*parg++ = '\\';
	      *parg++ = *p;

	      if (*p == escape_char && escape_char != '"')
		escape_char_run++;
	      else
		escape_char_run = 0;
	    }
	  /* double escape chars before enclosing quote */
	  while (escape_char_run > 0)
	    {
	      *parg++ = escape_char;
	      escape_char_run--;
	    }
#endif
	  *parg++ = '"';
	}
      else
	{
	  strcpy (parg, *targ);
	  parg += strlen (*targ);
	}
      *parg++ = ' ';
      targ++;
    }
  *--parg = '\0';

  /* and envp...  */
  arglen = 1;
  targ = envp;
  numenv = 1; /* for end null */
  while (*targ)
    {
      arglen += strlen (*targ++) + 1;
      numenv++;
    }
  /* extra env vars... */
  sprintf (ppid_env_var_buffer, "EM_PARENT_PROCESS_ID=%lu",
	   GetCurrentProcessId ());
  arglen += strlen (ppid_env_var_buffer) + 1;
  numenv++;

  /* merge env passed in and extra env into one, and sort it.  */
  targ = (char **) alloca (numenv * sizeof (char *));
  merge_and_sort_env (envp, extra_env, targ);

  /* concatenate env entries.  */
  env = alloca (arglen);
  parg = env;
  while (*targ)
    {
      strcpy (parg, *targ);
      parg += strlen (*targ++);
      *parg++ = '\0';
    }
  *parg++ = '\0';
  *parg = '\0';

  cp = new_child ();
  if (cp == NULL)
    {
      errno = EAGAIN;
      return -1;
    }

  /* Now create the process.  */
  if (!create_child (cmdname, cmdline, env, is_gui_app, &pid, cp))
    {
      delete_child (cp);
      errno = ENOEXEC;
      return -1;
    }

  return pid;
}

/* Emulate the select call.
   Wait for available input on any of the given rfds, or timeout if
   a timeout is given and no input is detected.  wfds are supported
   only for asynchronous 'connect' calls.  efds are not supported
   and must be NULL.

   For simplicity, we detect the death of child processes here and
   synchronously call the SIGCHLD handler.  Since it is possible for
   children to be created without a corresponding pipe handle from which
   to read output, we wait separately on the process handles as well as
   the char_avail events for each process pipe.  We only call
   wait/reap_process when the process actually terminates.

   To reduce the number of places in which Emacs can be hung such that
   C-g is not able to interrupt it, we always wait on interrupt_handle
   (which is signaled by the input thread when C-g is detected).  If we
   detect that we were woken up by C-g, we return -1 with errno set to
   EINTR as on Unix.  */

/* From w32console.c */
extern HANDLE keyboard_handle;

/* From w32xfns.c */
extern HANDLE interrupt_handle;

/* From process.c */
extern int proc_buffered_char[];

int
sys_select (int nfds, SELECT_TYPE *rfds, SELECT_TYPE *wfds, SELECT_TYPE *efds,
	    const struct timespec *timeout, const sigset_t *ignored)
{
  SELECT_TYPE orfds, owfds;
  DWORD timeout_ms, start_time;
  int i, nh, nc, nr;
  DWORD active;
  child_process *cp, *cps[MAX_CHILDREN];
  HANDLE wait_hnd[MAXDESC + MAX_CHILDREN];
  int fdindex[MAXDESC];   /* mapping from wait handles back to descriptors */

  timeout_ms =
    timeout ? (timeout->tv_sec * 1000 + timeout->tv_nsec / 1000000) : INFINITE;

  /* If the descriptor sets are NULL but timeout isn't, then just Sleep.  */
  if (rfds == NULL && wfds == NULL && efds == NULL && timeout != NULL)
    {
      Sleep (timeout_ms);
      return 0;
    }

  /* Otherwise, we only handle rfds and wfds, so fail otherwise.  */
  if ((rfds == NULL && wfds == NULL) || efds != NULL)
    {
      errno = EINVAL;
      return -1;
    }

  if (rfds)
    {
      orfds = *rfds;
      FD_ZERO (rfds);
    }
  else
    FD_ZERO (&orfds);
  if (wfds)
    {
      owfds = *wfds;
      FD_ZERO (wfds);
    }
  else
    FD_ZERO (&owfds);
  nr = 0;

  /* If interrupt_handle is available and valid, always wait on it, to
     detect C-g (quit).  */
  nh = 0;
  if (interrupt_handle && interrupt_handle != INVALID_HANDLE_VALUE)
    {
      wait_hnd[0] = interrupt_handle;
      fdindex[0] = -1;
      nh++;
    }

  /* Build a list of pipe handles to wait on.  */
  for (i = 0; i < nfds; i++)
    if (FD_ISSET (i, &orfds) || FD_ISSET (i, &owfds))
      {
	if (i == 0)
	  {
	    if (keyboard_handle)
	      {
		/* Handle stdin specially */
		wait_hnd[nh] = keyboard_handle;
		fdindex[nh] = i;
		nh++;
	      }

	    /* Check for any emacs-generated input in the queue since
	       it won't be detected in the wait */
	    if (rfds && detect_input_pending ())
	      {
		FD_SET (i, rfds);
		return 1;
	      }
	    else if (noninteractive)
	      {
		if (handle_file_notifications (NULL))
		  return 1;
	      }
	  }
	else
	  {
	    /* Child process and socket/comm port input.  */
	    cp = fd_info[i].cp;
	    if (FD_ISSET (i, &owfds)
		&& cp
		&& (fd_info[i].flags & FILE_CONNECT) == 0)
	      {
		DebPrint (("sys_select: fd %d is in wfds, but FILE_CONNECT is reset!\n", i));
		cp = NULL;
	      }
	    if (cp)
	      {
		int current_status = cp->status;

		if (current_status == STATUS_READ_ACKNOWLEDGED)
		  {
		    /* Tell reader thread which file handle to use. */
		    cp->fd = i;
		    /* Zero out the error code.  */
		    cp->errcode = 0;
		    /* Wake up the reader thread for this process */
		    cp->status = STATUS_READ_READY;
		    if (!SetEvent (cp->char_consumed))
		      DebPrint (("sys_select.SetEvent failed with "
				 "%lu for fd %ld\n", GetLastError (), i));
		  }

#ifdef CHECK_INTERLOCK
		/* slightly crude cross-checking of interlock between threads */

		current_status = cp->status;
		if (WaitForSingleObject (cp->char_avail, 0) == WAIT_OBJECT_0)
		  {
		    /* char_avail has been signaled, so status (which may
		       have changed) should indicate read has completed
		       but has not been acknowledged. */
		    current_status = cp->status;
		    if (current_status != STATUS_READ_SUCCEEDED
			&& current_status != STATUS_READ_FAILED)
		      DebPrint (("char_avail set, but read not completed: status %d\n",
				 current_status));
		  }
		else
		  {
		    /* char_avail has not been signaled, so status should
		       indicate that read is in progress; small possibility
		       that read has completed but event wasn't yet signaled
		       when we tested it (because a context switch occurred
		       or if running on separate CPUs). */
		    if (current_status != STATUS_READ_READY
			&& current_status != STATUS_READ_IN_PROGRESS
			&& current_status != STATUS_READ_SUCCEEDED
			&& current_status != STATUS_READ_FAILED)
		      DebPrint (("char_avail reset, but read status is bad: %d\n",
				 current_status));
		  }
#endif
		wait_hnd[nh] = cp->char_avail;
		fdindex[nh] = i;
		if (!wait_hnd[nh]) emacs_abort ();
		nh++;
#ifdef FULL_DEBUG
		DebPrint (("select waiting on child %d fd %d\n",
			   cp-child_procs, i));
#endif
	      }
	    else
	      {
		/* Unable to find something to wait on for this fd, skip */

		/* Note that this is not a fatal error, and can in fact
		   happen in unusual circumstances.  Specifically, if
		   sys_spawnve fails, eg. because the program doesn't
		   exist, and debug-on-error is t so Fsignal invokes a
		   nested input loop, then the process output pipe is
		   still included in input_wait_mask with no child_proc
		   associated with it.  (It is removed when the debugger
		   exits the nested input loop and the error is thrown.)  */

		DebPrint (("sys_select: fd %ld is invalid! ignoring\n", i));
	      }
	  }
      }

count_children:
  /* Add handles of child processes.  */
  nc = 0;
  for (cp = child_procs + (child_proc_count-1); cp >= child_procs; cp--)
    /* Some child_procs might be sockets; ignore them.  Also some
       children may have died already, but we haven't finished reading
       the process output; ignore them too.  */
    if ((CHILD_ACTIVE (cp) && cp->procinfo.hProcess)
	&& (cp->fd < 0
	    || (fd_info[cp->fd].flags & FILE_SEND_SIGCHLD) == 0
	    || (fd_info[cp->fd].flags & FILE_AT_EOF) != 0)
	)
      {
	wait_hnd[nh + nc] = cp->procinfo.hProcess;
	cps[nc] = cp;
	nc++;
      }

  /* Nothing to look for, so we didn't find anything */
  if (nh + nc == 0)
    {
      if (timeout)
	Sleep (timeout_ms);
      if (noninteractive)
	{
	  if (handle_file_notifications (NULL))
	    return 1;
	}
      return 0;
    }

  start_time = GetTickCount ();

  /* Wait for input or child death to be signaled.  If user input is
     allowed, then also accept window messages.  */
  if (FD_ISSET (0, &orfds))
    active = MsgWaitForMultipleObjects (nh + nc, wait_hnd, FALSE, timeout_ms,
					QS_ALLINPUT);
  else
    active = WaitForMultipleObjects (nh + nc, wait_hnd, FALSE, timeout_ms);

  if (active == WAIT_FAILED)
    {
      DebPrint (("select.WaitForMultipleObjects (%d, %lu) failed with %lu\n",
		 nh + nc, timeout_ms, GetLastError ()));
      /* don't return EBADF - this causes wait_reading_process_output to
	 abort; WAIT_FAILED is returned when single-stepping under
	 Windows 95 after switching thread focus in debugger, and
	 possibly at other times. */
      errno = EINTR;
      return -1;
    }
  else if (active == WAIT_TIMEOUT)
    {
      if (noninteractive)
	{
	  if (handle_file_notifications (NULL))
	    return 1;
	}
      return 0;
    }
  else if (active >= WAIT_OBJECT_0
	   && active < WAIT_OBJECT_0+MAXIMUM_WAIT_OBJECTS)
    {
      active -= WAIT_OBJECT_0;
    }
  else if (active >= WAIT_ABANDONED_0
	   && active < WAIT_ABANDONED_0+MAXIMUM_WAIT_OBJECTS)
    {
      active -= WAIT_ABANDONED_0;
    }
  else
    emacs_abort ();

  /* Loop over all handles after active (now officially documented as
     being the first signaled handle in the array).  We do this to
     ensure fairness, so that all channels with data available will be
     processed - otherwise higher numbered channels could be starved. */
  do
    {
      if (active == nh + nc)
	{
	  /* There are messages in the lisp thread's queue; we must
             drain the queue now to ensure they are processed promptly,
             because if we don't do so, we will not be woken again until
             further messages arrive.

	     NB. If ever we allow window message procedures to callback
	     into lisp, we will need to ensure messages are dispatched
	     at a safe time for lisp code to be run (*), and we may also
	     want to provide some hooks in the dispatch loop to cater
	     for modeless dialogs created by lisp (ie. to register
	     window handles to pass to IsDialogMessage).

	     (*) Note that MsgWaitForMultipleObjects above is an
	     internal dispatch point for messages that are sent to
	     windows created by this thread.  */
	  if (drain_message_queue ()
	      /* If drain_message_queue returns non-zero, that means
		 we received a WM_EMACS_FILENOTIFY message.  If this
		 is a TTY frame, we must signal the caller that keyboard
		 input is available, so that w32_console_read_socket
		 will be called to pick up the notifications.  If we
		 don't do that, file notifications will only work when
		 the Emacs TTY frame has focus.  */
	      && FRAME_TERMCAP_P (SELECTED_FRAME ())
	      /* they asked for stdin reads */
	      && FD_ISSET (0, &orfds)
	      /* the stdin handle is valid */
	      && keyboard_handle)
	    {
	      FD_SET (0, rfds);
	      if (nr == 0)
		nr = 1;
	    }
	}
      else if (active >= nh)
	{
	  cp = cps[active - nh];

	  /* We cannot always signal SIGCHLD immediately; if we have not
	     finished reading the process output, we must delay sending
	     SIGCHLD until we do.  */

	  if (cp->fd >= 0 && (fd_info[cp->fd].flags & FILE_AT_EOF) == 0)
	    fd_info[cp->fd].flags |= FILE_SEND_SIGCHLD;
	  /* SIG_DFL for SIGCHLD is ignored */
	  else if (sig_handlers[SIGCHLD] != SIG_DFL &&
		   sig_handlers[SIGCHLD] != SIG_IGN)
	    {
#ifdef FULL_DEBUG
	      DebPrint (("select calling SIGCHLD handler for pid %d\n",
			 cp->pid));
#endif
	      sig_handlers[SIGCHLD] (SIGCHLD);
	    }
	}
      else if (fdindex[active] == -1)
	{
	  /* Quit (C-g) was detected.  */
	  errno = EINTR;
	  return -1;
	}
      else if (rfds && fdindex[active] == 0)
	{
	  /* Keyboard input available */
	  FD_SET (0, rfds);
	  nr++;
	}
      else
	{
	  /* Must be a socket or pipe - read ahead should have
             completed, either succeeding or failing.  If this handle
             was waiting for an async 'connect', reset the connect
             flag, so it could read from now on.  */
	  if (wfds && (fd_info[fdindex[active]].flags & FILE_CONNECT) != 0)
	    {
	      cp = fd_info[fdindex[active]].cp;
	      if (cp)
		{
		  /* Don't reset the FILE_CONNECT bit and don't
		     acknowledge the read if the status is
		     STATUS_CONNECT_FAILED or some other
		     failure. That's because the thread exits in those
		     cases, so it doesn't need the ACK, and we want to
		     keep the FILE_CONNECT bit as evidence that the
		     connect failed, to be checked in sys_read.  */
		  if (cp->status == STATUS_READ_SUCCEEDED)
		    {
		      fd_info[cp->fd].flags &= ~FILE_CONNECT;
		      cp->status = STATUS_READ_ACKNOWLEDGED;
		    }
		  ResetEvent (cp->char_avail);
		}
	      FD_SET (fdindex[active], wfds);
	    }
	  else if (rfds)
	    FD_SET (fdindex[active], rfds);
	  nr++;
	}

      /* Even though wait_reading_process_output only reads from at most
	 one channel, we must process all channels here so that we reap
	 all children that have died.  */
      while (++active < nh + nc)
	if (WaitForSingleObject (wait_hnd[active], 0) == WAIT_OBJECT_0)
	  break;
    } while (active < nh + nc);

  if (noninteractive)
    {
      if (handle_file_notifications (NULL))
	nr++;
    }

  /* If no input has arrived and timeout hasn't expired, wait again.  */
  if (nr == 0)
    {
      DWORD elapsed = GetTickCount () - start_time;

      if (timeout_ms > elapsed)	/* INFINITE is MAX_UINT */
	{
	  if (timeout_ms != INFINITE)
	    timeout_ms -= elapsed;
	  goto count_children;
	}
    }

  return nr;
}

/* Substitute for certain kill () operations */

static BOOL CALLBACK
find_child_console (HWND hwnd, LPARAM arg)
{
  child_process * cp = (child_process *) arg;
  DWORD process_id;

  GetWindowThreadProcessId (hwnd, &process_id);
  if (process_id == cp->procinfo.dwProcessId)
    {
      char window_class[32];

      GetClassName (hwnd, window_class, sizeof (window_class));
      if (strcmp (window_class,
		  (os_subtype == OS_9X)
		  ? "tty"
		  : "ConsoleWindowClass") == 0)
	{
	  cp->hwnd = hwnd;
	  return FALSE;
	}
    }
  /* keep looking */
  return TRUE;
}

typedef BOOL (WINAPI * DebugBreakProcess_Proc) (
    HANDLE hProcess);

/* Emulate 'kill', but only for other processes.  */
int
sys_kill (pid_t pid, int sig)
{
  child_process *cp;
  HANDLE proc_hand;
  int need_to_free = 0;
  int rc = 0;

  /* Each process is in its own process group.  */
  if (pid < 0)
    pid = -pid;

  /* Only handle signals that can be mapped to a similar behavior on Windows */
  if (sig != 0
      && sig != SIGINT && sig != SIGKILL && sig != SIGQUIT && sig != SIGHUP && sig != SIGTRAP)
    {
      errno = EINVAL;
      return -1;
    }

  if (sig == 0)
    {
      /* It will take _some_ time before PID 4 or less on Windows will
	 be Emacs...  */
      if (pid <= 4)
	{
	  errno = EPERM;
	  return -1;
	}
      proc_hand = OpenProcess (PROCESS_QUERY_INFORMATION, 0, pid);
      if (proc_hand == NULL)
        {
	  DWORD err = GetLastError ();

	  switch (err)
	    {
	    case ERROR_ACCESS_DENIED: /* existing process, but access denied */
	      errno = EPERM;
	      return -1;
	    case ERROR_INVALID_PARAMETER: /* process PID does not exist */
	      errno = ESRCH;
	      return -1;
	    }
	}
      else
	CloseHandle (proc_hand);
      return 0;
    }

  cp = find_child_pid (pid);
  if (cp == NULL)
    {
      /* We were passed a PID of something other than our subprocess.
	 If that is our own PID, we will send to ourself a message to
	 close the selected frame, which does not necessarily
	 terminates Emacs.  But then we are not supposed to call
	 sys_kill with our own PID.  */

      DWORD desiredAccess =
	(sig == SIGTRAP) ? PROCESS_ALL_ACCESS : PROCESS_TERMINATE;

      proc_hand = OpenProcess (desiredAccess, 0, pid);
      if (proc_hand == NULL)
        {
	  errno = EPERM;
	  return -1;
	}
      need_to_free = 1;
    }
  else
    {
      proc_hand = cp->procinfo.hProcess;
      pid = cp->procinfo.dwProcessId;

      /* Try to locate console window for process. */
      EnumWindows (find_child_console, (LPARAM) cp);
    }

  if (sig == SIGINT || sig == SIGQUIT)
    {
      if (NILP (Vw32_start_process_share_console) && cp && cp->hwnd)
	{
	  BYTE control_scan_code = (BYTE) MapVirtualKey (VK_CONTROL, 0);
	  /* Fake Ctrl-C for SIGINT, and Ctrl-Break for SIGQUIT.  */
	  BYTE vk_break_code = (sig == SIGINT) ? 'C' : VK_CANCEL;
	  BYTE break_scan_code = (BYTE) MapVirtualKey (vk_break_code, 0);
	  HWND foreground_window;

	  if (break_scan_code == 0)
	    {
	      /* Fake Ctrl-C for SIGQUIT if we can't manage Ctrl-Break. */
	      vk_break_code = 'C';
	      break_scan_code = (BYTE) MapVirtualKey (vk_break_code, 0);
	    }

	  foreground_window = GetForegroundWindow ();
	  if (foreground_window)
	    {
              /* NT 5.0, and apparently also Windows 98, will not allow
		 a Window to be set to foreground directly without the
		 user's involvement. The workaround is to attach
		 ourselves to the thread that owns the foreground
		 window, since that is the only thread that can set the
		 foreground window.  */
              DWORD foreground_thread, child_thread;
              foreground_thread =
		GetWindowThreadProcessId (foreground_window, NULL);
	      if (foreground_thread == GetCurrentThreadId ()
                  || !AttachThreadInput (GetCurrentThreadId (),
                                         foreground_thread, TRUE))
                foreground_thread = 0;

              child_thread = GetWindowThreadProcessId (cp->hwnd, NULL);
	      if (child_thread == GetCurrentThreadId ()
                  || !AttachThreadInput (GetCurrentThreadId (),
                                         child_thread, TRUE))
                child_thread = 0;

              /* Set the foreground window to the child.  */
              if (SetForegroundWindow (cp->hwnd))
                {
		  /* Record the state of the Ctrl key: the user could
		     have it depressed while we are simulating Ctrl-C,
		     in which case we will have to leave the state of
		     Ctrl depressed when we are done.  */
		  short ctrl_state = GetKeyState (VK_CONTROL) & 0x8000;

                  /* Generate keystrokes as if user had typed Ctrl-Break or
                     Ctrl-C.  */
                  keybd_event (VK_CONTROL, control_scan_code, 0, 0);
                  keybd_event (vk_break_code, break_scan_code,
		    (vk_break_code == 'C' ? 0 : KEYEVENTF_EXTENDEDKEY), 0);
                  keybd_event (vk_break_code, break_scan_code,
                    (vk_break_code == 'C' ? 0 : KEYEVENTF_EXTENDEDKEY)
                    | KEYEVENTF_KEYUP, 0);
                  keybd_event (VK_CONTROL, control_scan_code,
                               KEYEVENTF_KEYUP, 0);

                  /* Sleep for a bit to give time for Emacs frame to respond
                     to focus change events (if Emacs was active app).  */
                  Sleep (100);

                  SetForegroundWindow (foreground_window);
		  /* If needed, restore the state of Ctrl.  */
		  if (ctrl_state != 0)
		    keybd_event (VK_CONTROL, control_scan_code, 0, 0);
                }
              /* Detach from the foreground and child threads now that
                 the foreground switching is over.  */
              if (foreground_thread)
                AttachThreadInput (GetCurrentThreadId (),
                                   foreground_thread, FALSE);
              if (child_thread)
                AttachThreadInput (GetCurrentThreadId (),
                                   child_thread, FALSE);
            }
        }
      /* Ctrl-Break is NT equivalent of SIGINT.  */
      else if (!GenerateConsoleCtrlEvent (CTRL_BREAK_EVENT, pid))
        {
	  DebPrint (("sys_kill.GenerateConsoleCtrlEvent return %d "
		     "for pid %lu\n", GetLastError (), pid));
	  errno = EINVAL;
	  rc = -1;
	}
    }
  else if (sig == SIGTRAP)
    {
      static DebugBreakProcess_Proc s_pfn_Debug_Break_Process = NULL;

      if (g_b_init_debug_break_process == 0)
	{
	  g_b_init_debug_break_process = 1;
	  s_pfn_Debug_Break_Process = (DebugBreakProcess_Proc)
	    GetProcAddress (GetModuleHandle ("kernel32.dll"),
			    "DebugBreakProcess");
	}

      if (s_pfn_Debug_Break_Process == NULL)
	{
	  errno = ENOTSUP;
	  rc = -1;
	}
      else if (!s_pfn_Debug_Break_Process (proc_hand))
	{
	  DWORD err = GetLastError ();

	  DebPrint (("sys_kill.DebugBreakProcess return %d "
		     "for pid %lu\n", err, pid));

	  switch (err)
	    {
	    case ERROR_ACCESS_DENIED:
	      errno = EPERM;
	      break;
	    default:
	      errno = EINVAL;
	      break;
	    }

	  rc = -1;
	}
    }
  else
    {
      if (NILP (Vw32_start_process_share_console) && cp && cp->hwnd)
	{
#if 1
	  if (os_subtype == OS_9X)
	    {
/*
   Another possibility is to try terminating the VDM out-right by
   calling the Shell VxD (id 0x17) V86 interface, function #4
   "SHELL_Destroy_VM", ie.

     mov edx,4
     mov ebx,vm_handle
     call shellapi

   First need to determine the current VM handle, and then arrange for
   the shellapi call to be made from the system vm (by using
   Switch_VM_and_callback).

   Could try to invoke DestroyVM through CallVxD.

*/
#if 0
	      /* On Windows 95, posting WM_QUIT causes the 16-bit subsystem
		 to hang when cmdproxy is used in conjunction with
		 command.com for an interactive shell.  Posting
		 WM_CLOSE pops up a dialog that, when Yes is selected,
		 does the same thing.  TerminateProcess is also less
		 than ideal in that subprocesses tend to stick around
		 until the machine is shutdown, but at least it
		 doesn't freeze the 16-bit subsystem.  */
	      PostMessage (cp->hwnd, WM_QUIT, 0xff, 0);
#endif
	      if (!TerminateProcess (proc_hand, 0xff))
		{
		  DebPrint (("sys_kill.TerminateProcess returned %d "
			     "for pid %lu\n", GetLastError (), pid));
		  errno = EINVAL;
		  rc = -1;
		}
	    }
	  else
#endif
	    PostMessage (cp->hwnd, WM_CLOSE, 0, 0);
	}
      /* Kill the process.  On W32 this doesn't kill child processes
	 so it doesn't work very well for shells which is why it's not
	 used in every case.  */
      else if (!TerminateProcess (proc_hand, 0xff))
        {
	  DebPrint (("sys_kill.TerminateProcess returned %d "
		     "for pid %lu\n", GetLastError (), pid));
	  errno = EINVAL;
	  rc = -1;
        }
    }

  if (need_to_free)
    CloseHandle (proc_hand);

  return rc;
}

/* The following two routines are used to manipulate stdin, stdout, and
   stderr of our child processes.

   Assuming that in, out, and err are *not* inheritable, we make them
   stdin, stdout, and stderr of the child as follows:

   - Save the parent's current standard handles.
   - Set the std handles to inheritable duplicates of the ones being passed in.
     (Note that _get_osfhandle() is an io.h procedure that retrieves the
     NT file handle for a crt file descriptor.)
   - Spawn the child, which inherits in, out, and err as stdin,
     stdout, and stderr. (see Spawnve)
   - Close the std handles passed to the child.
   - Reset the parent's standard handles to the saved handles.
     (see reset_standard_handles)
   We assume that the caller closes in, out, and err after calling us.  */

void
prepare_standard_handles (int in, int out, int err, HANDLE handles[3])
{
  HANDLE parent;
  HANDLE newstdin, newstdout, newstderr;

  parent = GetCurrentProcess ();

  handles[0] = GetStdHandle (STD_INPUT_HANDLE);
  handles[1] = GetStdHandle (STD_OUTPUT_HANDLE);
  handles[2] = GetStdHandle (STD_ERROR_HANDLE);

  /* make inheritable copies of the new handles */
  if (!DuplicateHandle (parent,
		       (HANDLE) _get_osfhandle (in),
		       parent,
		       &newstdin,
		       0,
		       TRUE,
		       DUPLICATE_SAME_ACCESS))
    report_file_error ("Duplicating input handle for child", Qnil);

  if (!DuplicateHandle (parent,
		       (HANDLE) _get_osfhandle (out),
		       parent,
		       &newstdout,
		       0,
		       TRUE,
		       DUPLICATE_SAME_ACCESS))
    report_file_error ("Duplicating output handle for child", Qnil);

  if (!DuplicateHandle (parent,
		       (HANDLE) _get_osfhandle (err),
		       parent,
		       &newstderr,
		       0,
		       TRUE,
		       DUPLICATE_SAME_ACCESS))
    report_file_error ("Duplicating error handle for child", Qnil);

  /* and store them as our std handles */
  if (!SetStdHandle (STD_INPUT_HANDLE, newstdin))
    report_file_error ("Changing stdin handle", Qnil);

  if (!SetStdHandle (STD_OUTPUT_HANDLE, newstdout))
    report_file_error ("Changing stdout handle", Qnil);

  if (!SetStdHandle (STD_ERROR_HANDLE, newstderr))
    report_file_error ("Changing stderr handle", Qnil);
}

void
reset_standard_handles (int in, int out, int err, HANDLE handles[3])
{
  /* close the duplicated handles passed to the child */
  CloseHandle (GetStdHandle (STD_INPUT_HANDLE));
  CloseHandle (GetStdHandle (STD_OUTPUT_HANDLE));
  CloseHandle (GetStdHandle (STD_ERROR_HANDLE));

  /* now restore parent's saved std handles */
  SetStdHandle (STD_INPUT_HANDLE, handles[0]);
  SetStdHandle (STD_OUTPUT_HANDLE, handles[1]);
  SetStdHandle (STD_ERROR_HANDLE, handles[2]);
}

void
set_process_dir (char * dir)
{
  process_dir = dir;
}

/* To avoid problems with winsock implementations that work over dial-up
   connections causing or requiring a connection to exist while Emacs is
   running, Emacs no longer automatically loads winsock on startup if it
   is present.  Instead, it will be loaded when open-network-stream is
   first called.

   To allow full control over when winsock is loaded, we provide these
   two functions to dynamically load and unload winsock.  This allows
   dial-up users to only be connected when they actually need to use
   socket services.  */

/* From w32.c */
extern HANDLE winsock_lib;
extern BOOL term_winsock (void);

DEFUN ("w32-has-winsock", Fw32_has_winsock, Sw32_has_winsock, 0, 1, 0,
       doc: /* Test for presence of the Windows socket library `winsock'.
Returns non-nil if winsock support is present, nil otherwise.

If the optional argument LOAD-NOW is non-nil, the winsock library is
also loaded immediately if not already loaded.  If winsock is loaded,
the winsock local hostname is returned (since this may be different from
the value of `system-name' and should supplant it), otherwise t is
returned to indicate winsock support is present.  */)
  (Lisp_Object load_now)
{
  int have_winsock;

  have_winsock = init_winsock (!NILP (load_now));
  if (have_winsock)
    {
      if (winsock_lib != NULL)
	{
	  /* Return new value for system-name.  The best way to do this
	     is to call init_system_name, saving and restoring the
	     original value to avoid side-effects.  */
	  Lisp_Object orig_hostname = Vsystem_name;
	  Lisp_Object hostname;

	  init_system_name ();
	  hostname = Vsystem_name;
	  Vsystem_name = orig_hostname;
	  return hostname;
	}
      return Qt;
    }
  return Qnil;
}

DEFUN ("w32-unload-winsock", Fw32_unload_winsock, Sw32_unload_winsock,
       0, 0, 0,
       doc: /* Unload the Windows socket library `winsock' if loaded.
This is provided to allow dial-up socket connections to be disconnected
when no longer needed.  Returns nil without unloading winsock if any
socket connections still exist.  */)
  (void)
{
  return term_winsock () ? Qt : Qnil;
}


/* Some miscellaneous functions that are Windows specific, but not GUI
   specific (ie. are applicable in terminal or batch mode as well).  */

DEFUN ("w32-short-file-name", Fw32_short_file_name, Sw32_short_file_name, 1, 1, 0,
       doc: /* Return the short file name version (8.3) of the full path of FILENAME.
If FILENAME does not exist, return nil.
All path elements in FILENAME are converted to their short names.  */)
  (Lisp_Object filename)
{
  char shortname[MAX_PATH];

  CHECK_STRING (filename);

  /* first expand it.  */
  filename = Fexpand_file_name (filename, Qnil);

  /* luckily, this returns the short version of each element in the path.  */
  if (w32_get_short_filename (SSDATA (ENCODE_FILE (filename)),
			      shortname, MAX_PATH) == 0)
    return Qnil;

  dostounix_filename (shortname);

  /* No need to DECODE_FILE, because 8.3 names are pure ASCII.   */
  return build_string (shortname);
}


DEFUN ("w32-long-file-name", Fw32_long_file_name, Sw32_long_file_name,
       1, 1, 0,
       doc: /* Return the long file name version of the full path of FILENAME.
If FILENAME does not exist, return nil.
All path elements in FILENAME are converted to their long names.  */)
  (Lisp_Object filename)
{
  char longname[ MAX_UTF8_PATH ];
  int drive_only = 0;

  CHECK_STRING (filename);

  if (SBYTES (filename) == 2
      && *(SDATA (filename) + 1) == ':')
    drive_only = 1;

  /* first expand it.  */
  filename = Fexpand_file_name (filename, Qnil);

  if (!w32_get_long_filename (SSDATA (ENCODE_FILE (filename)), longname,
			      MAX_UTF8_PATH))
    return Qnil;

  dostounix_filename (longname);

  /* If we were passed only a drive, make sure that a slash is not appended
     for consistency with directories.  Allow for drive mapping via SUBST
     in case expand-file-name is ever changed to expand those.  */
  if (drive_only && longname[1] == ':' && longname[2] == '/' && !longname[3])
    longname[2] = '\0';

  return DECODE_FILE (build_unibyte_string (longname));
}

DEFUN ("w32-set-process-priority", Fw32_set_process_priority,
       Sw32_set_process_priority, 2, 2, 0,
       doc: /* Set the priority of PROCESS to PRIORITY.
If PROCESS is nil, the priority of Emacs is changed, otherwise the
priority of the process whose pid is PROCESS is changed.
PRIORITY should be one of the symbols high, normal, or low;
any other symbol will be interpreted as normal.

If successful, the return value is t, otherwise nil.  */)
  (Lisp_Object process, Lisp_Object priority)
{
  HANDLE proc_handle = GetCurrentProcess ();
  DWORD  priority_class = NORMAL_PRIORITY_CLASS;
  Lisp_Object result = Qnil;

  CHECK_SYMBOL (priority);

  if (!NILP (process))
    {
      DWORD pid;
      child_process *cp;

      CHECK_NUMBER (process);

      /* Allow pid to be an internally generated one, or one obtained
	 externally.  This is necessary because real pids on Windows 95 are
	 negative.  */

      pid = XINT (process);
      cp = find_child_pid (pid);
      if (cp != NULL)
	pid = cp->procinfo.dwProcessId;

      proc_handle = OpenProcess (PROCESS_SET_INFORMATION, FALSE, pid);
    }

  if (EQ (priority, Qhigh))
    priority_class = HIGH_PRIORITY_CLASS;
  else if (EQ (priority, Qlow))
    priority_class = IDLE_PRIORITY_CLASS;

  if (proc_handle != NULL)
    {
      if (SetPriorityClass (proc_handle, priority_class))
	result = Qt;
      if (!NILP (process))
	CloseHandle (proc_handle);
    }

  return result;
}

DEFUN ("w32-application-type", Fw32_application_type,
       Sw32_application_type, 1, 1, 0,
       doc: /* Return the type of an MS-Windows PROGRAM.

Knowing the type of an executable could be useful for formatting
file names passed to it or for quoting its command-line arguments.

PROGRAM should specify an executable file, including the extension.

The value is one of the following:

`dos'        -- a DOS .com program or some other non-PE executable
`cygwin'     -- a Cygwin program that depends on Cygwin DLL
`msys'       -- an MSYS 1.x or MSYS2 program
`w32-native' -- a native Windows application
`unknown'    -- a file that doesn't exist, or cannot be open, or whose
                name is not encodable in the current ANSI codepage.

Note that for .bat and .cmd batch files the function returns the type
of their command interpreter, as specified by the \"COMSPEC\"
environment variable.

This function returns `unknown' for programs whose file names
include characters not supported by the current ANSI codepage, as
such programs cannot be invoked by Emacs anyway.  */)
     (Lisp_Object program)
{
  int is_dos_app, is_cygwin_app, is_msys_app, dummy;
  Lisp_Object encoded_progname;
  char *progname, progname_a[MAX_PATH];

  program = Fexpand_file_name (program, Qnil);
  encoded_progname = ENCODE_FILE (program);
  progname = SSDATA (encoded_progname);
  unixtodos_filename (progname);
  filename_to_ansi (progname, progname_a);
  /* Reject file names that cannot be encoded in the current ANSI
     codepage.  */
  if (_mbspbrk ((unsigned char *)progname_a, (const unsigned char *)"?"))
    return Qunknown;

  if (w32_executable_type (progname_a, &is_dos_app, &is_cygwin_app,
			   &is_msys_app, &dummy) != 0)
    return Qunknown;
  if (is_dos_app)
    return Qdos;
  if (is_cygwin_app)
    return Qcygwin;
  if (is_msys_app)
    return Qmsys;
  return Qw32_native;
}

#ifdef HAVE_LANGINFO_CODESET
/* Emulation of nl_langinfo.  Used in fns.c:Flocale_info.  */
char *
nl_langinfo (nl_item item)
{
  /* Conversion of Posix item numbers to their Windows equivalents.  */
  static const LCTYPE w32item[] = {
    LOCALE_IDEFAULTANSICODEPAGE,
    LOCALE_SDAYNAME1, LOCALE_SDAYNAME2, LOCALE_SDAYNAME3,
    LOCALE_SDAYNAME4, LOCALE_SDAYNAME5, LOCALE_SDAYNAME6, LOCALE_SDAYNAME7,
    LOCALE_SMONTHNAME1, LOCALE_SMONTHNAME2, LOCALE_SMONTHNAME3,
    LOCALE_SMONTHNAME4, LOCALE_SMONTHNAME5, LOCALE_SMONTHNAME6,
    LOCALE_SMONTHNAME7, LOCALE_SMONTHNAME8, LOCALE_SMONTHNAME9,
    LOCALE_SMONTHNAME10, LOCALE_SMONTHNAME11, LOCALE_SMONTHNAME12
  };

  static char *nl_langinfo_buf = NULL;
  static int   nl_langinfo_len = 0;

  if (nl_langinfo_len <= 0)
    nl_langinfo_buf = xmalloc (nl_langinfo_len = 1);

  if (item < 0 || item >= _NL_NUM)
    nl_langinfo_buf[0] = 0;
  else
    {
      LCID cloc = GetThreadLocale ();
      int need_len = GetLocaleInfo (cloc, w32item[item] | LOCALE_USE_CP_ACP,
				    NULL, 0);

      if (need_len <= 0)
	nl_langinfo_buf[0] = 0;
      else
	{
	  if (item == CODESET)
	    {
	      need_len += 2;	/* for the "cp" prefix */
	      if (need_len < 8)	/* for the case we call GetACP */
		need_len = 8;
	    }
	  if (nl_langinfo_len <= need_len)
	    nl_langinfo_buf = xrealloc (nl_langinfo_buf,
					nl_langinfo_len = need_len);
	  if (!GetLocaleInfo (cloc, w32item[item] | LOCALE_USE_CP_ACP,
			      nl_langinfo_buf, nl_langinfo_len))
	    nl_langinfo_buf[0] = 0;
	  else if (item == CODESET)
	    {
	      if (strcmp (nl_langinfo_buf, "0") == 0 /* CP_ACP */
		  || strcmp (nl_langinfo_buf, "1") == 0) /* CP_OEMCP */
		sprintf (nl_langinfo_buf, "cp%u", GetACP ());
	      else
		{
		  memmove (nl_langinfo_buf + 2, nl_langinfo_buf,
			   strlen (nl_langinfo_buf) + 1);
		  nl_langinfo_buf[0] = 'c';
		  nl_langinfo_buf[1] = 'p';
		}
	    }
	}
    }
  return nl_langinfo_buf;
}
#endif	/* HAVE_LANGINFO_CODESET */

DEFUN ("w32-get-locale-info", Fw32_get_locale_info,
       Sw32_get_locale_info, 1, 2, 0,
       doc: /* Return information about the Windows locale LCID.
By default, return a three letter locale code which encodes the default
language as the first two characters, and the country or regional variant
as the third letter.  For example, ENU refers to `English (United States)',
while ENC means `English (Canadian)'.

If the optional argument LONGFORM is t, the long form of the locale
name is returned, e.g. `English (United States)' instead; if LONGFORM
is a number, it is interpreted as an LCTYPE constant and the corresponding
locale information is returned.

If LCID (a 16-bit number) is not a valid locale, the result is nil.  */)
  (Lisp_Object lcid, Lisp_Object longform)
{
  int got_abbrev;
  int got_full;
  char abbrev_name[32] = { 0 };
  char full_name[256] = { 0 };

  CHECK_NUMBER (lcid);

  if (!IsValidLocale (XINT (lcid), LCID_SUPPORTED))
    return Qnil;

  if (NILP (longform))
    {
      got_abbrev = GetLocaleInfo (XINT (lcid),
				  LOCALE_SABBREVLANGNAME | LOCALE_USE_CP_ACP,
				  abbrev_name, sizeof (abbrev_name));
      if (got_abbrev)
	return build_string (abbrev_name);
    }
  else if (EQ (longform, Qt))
    {
      got_full = GetLocaleInfo (XINT (lcid),
				LOCALE_SLANGUAGE | LOCALE_USE_CP_ACP,
				full_name, sizeof (full_name));
      if (got_full)
	return DECODE_SYSTEM (build_string (full_name));
    }
  else if (NUMBERP (longform))
    {
      got_full = GetLocaleInfo (XINT (lcid),
				XINT (longform),
				full_name, sizeof (full_name));
      /* GetLocaleInfo's return value includes the terminating null
	 character, when the returned information is a string, whereas
	 make_unibyte_string needs the string length without the
	 terminating null.  */
      if (got_full)
	return make_unibyte_string (full_name, got_full - 1);
    }

  return Qnil;
}


DEFUN ("w32-get-current-locale-id", Fw32_get_current_locale_id,
       Sw32_get_current_locale_id, 0, 0, 0,
       doc: /* Return Windows locale id for current locale setting.
This is a numerical value; use `w32-get-locale-info' to convert to a
human-readable form.  */)
  (void)
{
  return make_number (GetThreadLocale ());
}

static DWORD
int_from_hex (char * s)
{
  DWORD val = 0;
  static char hex[] = "0123456789abcdefABCDEF";
  char * p;

  while (*s && (p = strchr (hex, *s)) != NULL)
    {
      unsigned digit = p - hex;
      if (digit > 15)
	digit -= 6;
      val = val * 16 + digit;
      s++;
    }
  return val;
}

/* We need to build a global list, since the EnumSystemLocale callback
   function isn't given a context pointer.  */
Lisp_Object Vw32_valid_locale_ids;

static BOOL CALLBACK ALIGN_STACK
enum_locale_fn (LPTSTR localeNum)
{
  DWORD id = int_from_hex (localeNum);
  Vw32_valid_locale_ids = Fcons (make_number (id), Vw32_valid_locale_ids);
  return TRUE;
}

DEFUN ("w32-get-valid-locale-ids", Fw32_get_valid_locale_ids,
       Sw32_get_valid_locale_ids, 0, 0, 0,
       doc: /* Return list of all valid Windows locale ids.
Each id is a numerical value; use `w32-get-locale-info' to convert to a
human-readable form.  */)
  (void)
{
  Vw32_valid_locale_ids = Qnil;

  EnumSystemLocales (enum_locale_fn, LCID_SUPPORTED);

  Vw32_valid_locale_ids = Fnreverse (Vw32_valid_locale_ids);
  return Vw32_valid_locale_ids;
}


DEFUN ("w32-get-default-locale-id", Fw32_get_default_locale_id, Sw32_get_default_locale_id, 0, 1, 0,
       doc: /* Return Windows locale id for default locale setting.
By default, the system default locale setting is returned; if the optional
parameter USERP is non-nil, the user default locale setting is returned.
This is a numerical value; use `w32-get-locale-info' to convert to a
human-readable form.  */)
  (Lisp_Object userp)
{
  if (NILP (userp))
    return make_number (GetSystemDefaultLCID ());
  return make_number (GetUserDefaultLCID ());
}


DEFUN ("w32-set-current-locale", Fw32_set_current_locale, Sw32_set_current_locale, 1, 1, 0,
       doc: /* Make Windows locale LCID be the current locale setting for Emacs.
If successful, the new locale id is returned, otherwise nil.  */)
  (Lisp_Object lcid)
{
  CHECK_NUMBER (lcid);

  if (!IsValidLocale (XINT (lcid), LCID_SUPPORTED))
    return Qnil;

  if (!SetThreadLocale (XINT (lcid)))
    return Qnil;

  /* Need to set input thread locale if present.  */
  if (dwWindowsThreadId)
    /* Reply is not needed.  */
    PostThreadMessage (dwWindowsThreadId, WM_EMACS_SETLOCALE, XINT (lcid), 0);

  return make_number (GetThreadLocale ());
}


/* We need to build a global list, since the EnumCodePages callback
   function isn't given a context pointer.  */
Lisp_Object Vw32_valid_codepages;

static BOOL CALLBACK ALIGN_STACK
enum_codepage_fn (LPTSTR codepageNum)
{
  DWORD id = atoi (codepageNum);
  Vw32_valid_codepages = Fcons (make_number (id), Vw32_valid_codepages);
  return TRUE;
}

DEFUN ("w32-get-valid-codepages", Fw32_get_valid_codepages,
       Sw32_get_valid_codepages, 0, 0, 0,
       doc: /* Return list of all valid Windows codepages.  */)
  (void)
{
  Vw32_valid_codepages = Qnil;

  EnumSystemCodePages (enum_codepage_fn, CP_SUPPORTED);

  Vw32_valid_codepages = Fnreverse (Vw32_valid_codepages);
  return Vw32_valid_codepages;
}


DEFUN ("w32-get-console-codepage", Fw32_get_console_codepage,
       Sw32_get_console_codepage, 0, 0, 0,
       doc: /* Return current Windows codepage for console input.  */)
  (void)
{
  return make_number (GetConsoleCP ());
}


DEFUN ("w32-set-console-codepage", Fw32_set_console_codepage,
       Sw32_set_console_codepage, 1, 1, 0,
       doc: /* Make Windows codepage CP be the codepage for Emacs tty keyboard input.
This codepage setting affects keyboard input in tty mode.
If successful, the new CP is returned, otherwise nil.  */)
  (Lisp_Object cp)
{
  CHECK_NUMBER (cp);

  if (!IsValidCodePage (XINT (cp)))
    return Qnil;

  if (!SetConsoleCP (XINT (cp)))
    return Qnil;

  return make_number (GetConsoleCP ());
}


DEFUN ("w32-get-console-output-codepage", Fw32_get_console_output_codepage,
       Sw32_get_console_output_codepage, 0, 0, 0,
       doc: /* Return current Windows codepage for console output.  */)
  (void)
{
  return make_number (GetConsoleOutputCP ());
}


DEFUN ("w32-set-console-output-codepage", Fw32_set_console_output_codepage,
       Sw32_set_console_output_codepage, 1, 1, 0,
       doc: /* Make Windows codepage CP be the codepage for Emacs console output.
This codepage setting affects display in tty mode.
If successful, the new CP is returned, otherwise nil.  */)
  (Lisp_Object cp)
{
  CHECK_NUMBER (cp);

  if (!IsValidCodePage (XINT (cp)))
    return Qnil;

  if (!SetConsoleOutputCP (XINT (cp)))
    return Qnil;

  return make_number (GetConsoleOutputCP ());
}


DEFUN ("w32-get-codepage-charset", Fw32_get_codepage_charset,
       Sw32_get_codepage_charset, 1, 1, 0,
       doc: /* Return charset ID corresponding to codepage CP.
Returns nil if the codepage is not valid or its charset ID could
not be determined.

Note that this function is only guaranteed to work with ANSI
codepages; most console codepages are not supported and will
yield nil.  */)
  (Lisp_Object cp)
{
  CHARSETINFO info;
  DWORD_PTR dwcp;

  CHECK_NUMBER (cp);

  if (!IsValidCodePage (XINT (cp)))
    return Qnil;

  /* Going through a temporary DWORD_PTR variable avoids compiler warning
     about cast to pointer from integer of different size, when
     building --with-wide-int or building for 64bit.  */
  dwcp = XINT (cp);
  if (TranslateCharsetInfo ((DWORD *) dwcp, &info, TCI_SRCCODEPAGE))
    return make_number (info.ciCharset);

  return Qnil;
}


DEFUN ("w32-get-valid-keyboard-layouts", Fw32_get_valid_keyboard_layouts,
       Sw32_get_valid_keyboard_layouts, 0, 0, 0,
       doc: /* Return list of Windows keyboard languages and layouts.
The return value is a list of pairs of language id and layout id.  */)
  (void)
{
  int num_layouts = GetKeyboardLayoutList (0, NULL);
  HKL * layouts = (HKL *) alloca (num_layouts * sizeof (HKL));
  Lisp_Object obj = Qnil;

  if (GetKeyboardLayoutList (num_layouts, layouts) == num_layouts)
    {
      while (--num_layouts >= 0)
	{
	  HKL kl = layouts[num_layouts];

	  obj = Fcons (Fcons (make_number (LOWORD (kl)),
			      make_number (HIWORD (kl))),
		       obj);
	}
    }

  return obj;
}


DEFUN ("w32-get-keyboard-layout", Fw32_get_keyboard_layout,
       Sw32_get_keyboard_layout, 0, 0, 0,
       doc: /* Return current Windows keyboard language and layout.
The return value is the cons of the language id and the layout id.  */)
  (void)
{
  HKL kl = GetKeyboardLayout (dwWindowsThreadId);

  return Fcons (make_number (LOWORD (kl)),
		make_number (HIWORD (kl)));
}


DEFUN ("w32-set-keyboard-layout", Fw32_set_keyboard_layout,
       Sw32_set_keyboard_layout, 1, 1, 0,
       doc: /* Make LAYOUT be the current keyboard layout for Emacs.
The keyboard layout setting affects interpretation of keyboard input.
If successful, the new layout id is returned, otherwise nil.  */)
  (Lisp_Object layout)
{
  HKL kl;

  CHECK_CONS (layout);
  CHECK_NUMBER_CAR (layout);
  CHECK_NUMBER_CDR (layout);

  kl = (HKL) (UINT_PTR) ((XINT (XCAR (layout)) & 0xffff)
			 | (XINT (XCDR (layout)) << 16));

  /* Synchronize layout with input thread.  */
  if (dwWindowsThreadId)
    {
      if (PostThreadMessage (dwWindowsThreadId, WM_EMACS_SETKEYBOARDLAYOUT,
			     (WPARAM) kl, 0))
	{
	  MSG msg;
	  GetMessage (&msg, NULL, WM_EMACS_DONE, WM_EMACS_DONE);

	  if (msg.wParam == 0)
	    return Qnil;
	}
    }
  else if (!ActivateKeyboardLayout (kl, 0))
    return Qnil;

  return Fw32_get_keyboard_layout ();
}

/* Two variables to interface between get_lcid and the EnumLocales
   callback function below.  */
#ifndef LOCALE_NAME_MAX_LENGTH
# define LOCALE_NAME_MAX_LENGTH 85
#endif
static LCID found_lcid;
static char lname[3 * LOCALE_NAME_MAX_LENGTH + 1 + 1];

/* Callback function for EnumLocales.  */
static BOOL CALLBACK
get_lcid_callback (LPTSTR locale_num_str)
{
  char *endp;
  char locval[2 * LOCALE_NAME_MAX_LENGTH + 1 + 1];
  LCID try_lcid = strtoul (locale_num_str, &endp, 16);

  if (GetLocaleInfo (try_lcid, LOCALE_SABBREVLANGNAME,
		     locval, LOCALE_NAME_MAX_LENGTH))
    {
      size_t locval_len;

      /* This is for when they only specify the language, as in "ENU".  */
      if (stricmp (locval, lname) == 0)
	{
	  found_lcid = try_lcid;
	  return FALSE;
	}
      locval_len = strlen (locval);
      strcpy (locval + locval_len, "_");
      if (GetLocaleInfo (try_lcid, LOCALE_SABBREVCTRYNAME,
			 locval + locval_len + 1, LOCALE_NAME_MAX_LENGTH))
	{
	  locval_len = strlen (locval);
	  if (strnicmp (locval, lname, locval_len) == 0
	      && (lname[locval_len] == '.'
		  || lname[locval_len] == '\0'))
	    {
	      found_lcid = try_lcid;
	      return FALSE;
	    }
	}
    }
  return TRUE;
}

/* Return the Locale ID (LCID) number given the locale's name, a
   string, in LOCALE_NAME.  This works by enumerating all the locales
   supported by the system, until we find one whose name matches
   LOCALE_NAME.  */
static LCID
get_lcid (const char *locale_name)
{
  /* A simple cache.  */
  static LCID last_lcid;
  static char last_locale[1000];

  /* The code below is not thread-safe, as it uses static variables.
     But this function is called only from the Lisp thread.  */
  if (last_lcid > 0 && strcmp (locale_name, last_locale) == 0)
    return last_lcid;

  strncpy (lname, locale_name, sizeof (lname) - 1);
  lname[sizeof (lname) - 1] = '\0';
  found_lcid = 0;
  EnumSystemLocales (get_lcid_callback, LCID_SUPPORTED);
  if (found_lcid > 0)
    {
      last_lcid = found_lcid;
      strcpy (last_locale, locale_name);
    }
  return found_lcid;
}

#ifndef _NLSCMPERROR
# define _NLSCMPERROR INT_MAX
#endif
#ifndef LINGUISTIC_IGNORECASE
# define LINGUISTIC_IGNORECASE  0x00000010
#endif

typedef int (WINAPI *CompareStringW_Proc)
  (LCID, DWORD, LPCWSTR, int, LPCWSTR, int);

int
w32_compare_strings (const char *s1, const char *s2, char *locname,
		     int ignore_case)
{
  LCID lcid = GetThreadLocale ();
  wchar_t *string1_w, *string2_w;
  int val, needed;
  static CompareStringW_Proc pCompareStringW;
  DWORD flags = 0;

  USE_SAFE_ALLOCA;

  /* The LCID machinery doesn't seem to support the "C" locale, so we
     need to do that by hand.  */
  if (locname
      && ((locname[0] == 'C' && (locname[1] == '\0' || locname[1] == '.'))
	  || strcmp (locname, "POSIX") == 0))
    return (ignore_case ? stricmp (s1, s2) : strcmp (s1, s2));

  if (!g_b_init_compare_string_w)
    {
      if (os_subtype == OS_9X)
	{
	  pCompareStringW =
            (CompareStringW_Proc) GetProcAddress (LoadLibrary ("Unicows.dll"),
                                                  "CompareStringW");
	  if (!pCompareStringW)
	    {
	      errno = EINVAL;
	      /* This return value is compatible with wcscoll and
		 other MS CRT functions.  */
	      return _NLSCMPERROR;
	    }
	}
      else
	pCompareStringW = CompareStringW;

      g_b_init_compare_string_w = 1;
    }

  needed = pMultiByteToWideChar (CP_UTF8, MB_ERR_INVALID_CHARS, s1, -1, NULL, 0);
  if (needed > 0)
    {
      SAFE_NALLOCA (string1_w, 1, needed + 1);
      pMultiByteToWideChar (CP_UTF8, MB_ERR_INVALID_CHARS, s1, -1,
			    string1_w, needed);
    }
  else
    {
      errno = EINVAL;
      return _NLSCMPERROR;
    }

  needed = pMultiByteToWideChar (CP_UTF8, MB_ERR_INVALID_CHARS, s2, -1, NULL, 0);
  if (needed > 0)
    {
      SAFE_NALLOCA (string2_w, 1, needed + 1);
      pMultiByteToWideChar (CP_UTF8, MB_ERR_INVALID_CHARS, s2, -1,
			    string2_w, needed);
    }
  else
    {
      SAFE_FREE ();
      errno = EINVAL;
      return _NLSCMPERROR;
    }

  if (locname)
    {
      /* Convert locale name string to LCID.  We don't want to use
	 LocaleNameToLCID because (a) it is only available since
	 Vista, and (b) it doesn't accept locale names returned by
	 'setlocale' and 'GetLocaleInfo'.  */
      LCID new_lcid = get_lcid (locname);

      if (new_lcid > 0)
	lcid = new_lcid;
      else
	error ("Invalid locale %s: Invalid argument", locname);
    }

  if (ignore_case)
    {
      /* NORM_IGNORECASE ignores any tertiary distinction, not just
	 case variants.  LINGUISTIC_IGNORECASE is more selective, and
	 is sensitive to the locale's language, but it is not
	 available before Vista.  */
      if (w32_major_version >= 6)
	flags |= LINGUISTIC_IGNORECASE;
      else
	flags |= NORM_IGNORECASE;
    }
  /* This approximates what glibc collation functions do when the
     locale's codeset is UTF-8.  */
  if (!NILP (Vw32_collate_ignore_punctuation))
    flags |= NORM_IGNORESYMBOLS;
  val = pCompareStringW (lcid, flags, string1_w, -1, string2_w, -1);
  SAFE_FREE ();
  if (!val)
    {
      errno = EINVAL;
      return _NLSCMPERROR;
    }
  return val - 2;
}


void
syms_of_ntproc (void)
{
  DEFSYM (Qhigh, "high");
  DEFSYM (Qlow, "low");
  DEFSYM (Qcygwin, "cygwin");
  DEFSYM (Qmsys, "msys");
  DEFSYM (Qw32_native, "w32-native");

  defsubr (&Sw32_has_winsock);
  defsubr (&Sw32_unload_winsock);

  defsubr (&Sw32_short_file_name);
  defsubr (&Sw32_long_file_name);
  defsubr (&Sw32_set_process_priority);
  defsubr (&Sw32_application_type);
  defsubr (&Sw32_get_locale_info);
  defsubr (&Sw32_get_current_locale_id);
  defsubr (&Sw32_get_default_locale_id);
  defsubr (&Sw32_get_valid_locale_ids);
  defsubr (&Sw32_set_current_locale);

  defsubr (&Sw32_get_console_codepage);
  defsubr (&Sw32_set_console_codepage);
  defsubr (&Sw32_get_console_output_codepage);
  defsubr (&Sw32_set_console_output_codepage);
  defsubr (&Sw32_get_valid_codepages);
  defsubr (&Sw32_get_codepage_charset);

  defsubr (&Sw32_get_valid_keyboard_layouts);
  defsubr (&Sw32_get_keyboard_layout);
  defsubr (&Sw32_set_keyboard_layout);

  DEFVAR_LISP ("w32-quote-process-args", Vw32_quote_process_args,
	       doc: /* Non-nil enables quoting of process arguments to ensure correct parsing.
Because Windows does not directly pass argv arrays to child processes,
programs have to reconstruct the argv array by parsing the command
line string.  For an argument to contain a space, it must be enclosed
in double quotes or it will be parsed as multiple arguments.

If the value is a character, that character will be used to escape any
quote characters that appear, otherwise a suitable escape character
will be chosen based on the type of the program.  */);
  Vw32_quote_process_args = Qt;

  DEFVAR_LISP ("w32-start-process-show-window",
	       Vw32_start_process_show_window,
	       doc: /* When nil, new child processes hide their windows.
When non-nil, they show their window in the method of their choice.
This variable doesn't affect GUI applications, which will never be hidden.  */);
  Vw32_start_process_show_window = Qnil;

  DEFVAR_LISP ("w32-start-process-share-console",
	       Vw32_start_process_share_console,
	       doc: /* When nil, new child processes are given a new console.
When non-nil, they share the Emacs console; this has the limitation of
allowing only one DOS subprocess to run at a time (whether started directly
or indirectly by Emacs), and preventing Emacs from cleanly terminating the
subprocess group, but may allow Emacs to interrupt a subprocess that doesn't
otherwise respond to interrupts from Emacs.  */);
  Vw32_start_process_share_console = Qnil;

  DEFVAR_LISP ("w32-start-process-inherit-error-mode",
	       Vw32_start_process_inherit_error_mode,
	       doc: /* When nil, new child processes revert to the default error mode.
When non-nil, they inherit their error mode setting from Emacs, which stops
them blocking when trying to access unmounted drives etc.  */);
  Vw32_start_process_inherit_error_mode = Qt;

  DEFVAR_INT ("w32-pipe-read-delay", w32_pipe_read_delay,
	      doc: /* Forced delay before reading subprocess output.
This is done to improve the buffering of subprocess output, by
avoiding the inefficiency of frequently reading small amounts of data.

If positive, the value is the number of milliseconds to sleep before
reading the subprocess output.  If negative, the magnitude is the number
of time slices to wait (effectively boosting the priority of the child
process temporarily).  A value of zero disables waiting entirely.  */);
  w32_pipe_read_delay = 50;

  DEFVAR_INT ("w32-pipe-buffer-size", w32_pipe_buffer_size,
	      doc: /* Size of buffer for pipes created to communicate with subprocesses.
The size is in bytes, and must be non-negative.  The default is zero,
which lets the OS use its default size, usually 4KB (4096 bytes).
Any negative value means to use the default value of zero.  */);
  w32_pipe_buffer_size = 0;

  DEFVAR_LISP ("w32-downcase-file-names", Vw32_downcase_file_names,
	       doc: /* Non-nil means convert all-upper case file names to lower case.
This applies when performing completions and file name expansion.
Note that the value of this setting also affects remote file names,
so you probably don't want to set to non-nil if you use case-sensitive
filesystems via ange-ftp.  */);
  Vw32_downcase_file_names = Qnil;

#if 0
  DEFVAR_LISP ("w32-generate-fake-inodes", Vw32_generate_fake_inodes,
	       doc: /* Non-nil means attempt to fake realistic inode values.
This works by hashing the truename of files, and should detect
aliasing between long and short (8.3 DOS) names, but can have
false positives because of hash collisions.  Note that determining
the truename of a file can be slow.  */);
  Vw32_generate_fake_inodes = Qnil;
#endif

  DEFVAR_LISP ("w32-get-true-file-attributes", Vw32_get_true_file_attributes,
	       doc: /* Non-nil means determine accurate file attributes in `file-attributes'.
This option controls whether to issue additional system calls to determine
accurate link counts, file type, and ownership information.  It is more
useful for files on NTFS volumes, where hard links and file security are
supported, than on volumes of the FAT family.

Without these system calls, link count will always be reported as 1 and file
ownership will be attributed to the current user.
The default value `local' means only issue these system calls for files
on local fixed drives.  A value of nil means never issue them.
Any other non-nil value means do this even on remote and removable drives
where the performance impact may be noticeable even on modern hardware.  */);
  Vw32_get_true_file_attributes = Qlocal;

  DEFVAR_LISP ("w32-collate-ignore-punctuation",
	       Vw32_collate_ignore_punctuation,
	       doc: /* Non-nil causes string collation functions ignore punctuation on MS-Windows.
On Posix platforms, `string-collate-lessp' and `string-collate-equalp'
ignore punctuation characters when they compare strings, if the
locale's codeset is UTF-8, as in \"en_US.UTF-8\".  Binding this option
to a non-nil value will achieve a similar effect on MS-Windows, where
locales with UTF-8 codeset are not supported.

Note that setting this to non-nil will also ignore blanks and symbols
in the strings.  So do NOT use this option when comparing file names
for equality, only when you need to sort them.  */);
  Vw32_collate_ignore_punctuation = Qnil;

  staticpro (&Vw32_valid_locale_ids);
  staticpro (&Vw32_valid_codepages);
}
/* end of w32proc.c */