summaryrefslogtreecommitdiff
path: root/lib-src/emacsclient.c
blob: b3dac7923908b361dfa93d8faa77e6317aee5a2c (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
/* Client process that communicates with GNU Emacs acting as server.
   Copyright (C) 1986, 1987, 1994 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 2, 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; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */


#define NO_SHORTNAMES
#include <../src/config.h>
#undef read
#undef write
#undef open
#undef close
#undef signal


#if !defined (HAVE_SOCKETS) && !defined (HAVE_SYSVIPC)
#include <stdio.h>

main (argc, argv)
     int argc;
     char **argv;
{
  fprintf (stderr, "%s: Sorry, the Emacs server is supported only\n",
	   argv[0]);
  fprintf (stderr, "on systems with Berkeley sockets or System V IPC.\n");
  exit (1);
}

#else /* HAVE_SOCKETS or HAVE_SYSVIPC */

#if defined (HAVE_SOCKETS) && ! defined (NO_SOCKETS_IN_FILE_SYSTEM)
/* BSD code is very different from SYSV IPC code */

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/stat.h>
#include <stdio.h>
#include <errno.h>

extern char *strerror ();
extern int errno;

int
main (argc, argv)
     int argc;
     char **argv;
{
  char system_name[32];
  int s, i;
  FILE *out;
  struct sockaddr_un server;
  char *homedir, *cwd, *str;
  char string[BUFSIZ];

  char *getenv (), *getwd ();
  char *getcwd ();
  int geteuid ();

  if (argc < 2)
    {
      fprintf (stderr, "Usage: %s [+linenumber] filename\n", argv[0]);
      exit (1);
    }

  /* 
   * Open up an AF_UNIX socket in this person's home directory
   */

  if ((s = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
    {
      fprintf (stderr, "%s: ", argv[0]);
      perror ("socket");
      exit (1);
    }
  server.sun_family = AF_UNIX;
#ifndef SERVER_HOME_DIR
  {
    struct stat statbfr;

    gethostname (system_name, sizeof (system_name));
    sprintf (server.sun_path, "/tmp/esrv%d-%s", geteuid (), system_name);

    if (stat (server.sun_path, &statbfr) == -1)
      {
	if (errno == ENOENT)
	  fprintf (stderr,
		   "%s: can't find socket; have you started the server?\n",
		   argv[0]);
	else
	  fprintf (stderr, "%s: can't stat %s: %s\n",
		   argv[0], server.sun_path, strerror (errno));
	exit (1);
      }
    if (statbfr.st_uid != geteuid ())
      {
	fprintf (stderr, "%s: Invalid socket owner\n", argv[0]);
	exit (1);
      }
  }
#else
  if ((homedir = getenv ("HOME")) == NULL)
    {
      fprintf (stderr, "%s: No home directory\n", argv[0]);
      exit (1);
    }
  strcpy (server.sun_path, homedir);
  strcat (server.sun_path, "/.emacs-server-");
  gethostname (system_name, sizeof (system_name));
  strcat (server.sun_path, system_name);
#endif

  if (connect (s, (struct sockaddr *) &server, strlen (server.sun_path) + 2)
      < 0)
    {
      fprintf (stderr, "%s: ", argv[0]);
      perror ("connect");
      exit (1);
    }
  if ((out = fdopen (s, "r+")) == NULL)
    {
      fprintf (stderr, "%s: ", argv[0]);
      perror ("fdopen");
      exit (1);
    }

#ifdef BSD
  cwd = getwd (string);
#else
  cwd = getcwd (string, sizeof string);
#endif
  if (cwd == 0)
    {
      /* getwd puts message in STRING if it fails.  */
      fprintf (stderr, "%s: %s (%s)\n", argv[0], string, strerror (errno));
      exit (1);
    }

  for (i = 1; i < argc; i++)
    {
      if (*argv[i] == '+')
	{
	  char *p = argv[i] + 1;
	  while (*p >= '0' && *p <= '9') p++;
	  if (*p != 0)
	    fprintf (out, "%s/", cwd);
	}
      else if (*argv[i] != '/')
	fprintf (out, "%s/", cwd);
      fprintf (out, "%s ", argv[i]);
    }
  fprintf (out, "\n");
  fflush (out);

  printf ("Waiting for Emacs...");
  fflush (stdout);

  rewind (out); /* re-read the output */
  str = fgets (string, BUFSIZ, out); 
  printf ("\n");

  /* Now, wait for an answer and print any messages.  */
  
  while (str = fgets (string, BUFSIZ, out))
    printf ("%s", str);
  
  return 0;
}

#else /* This is the SYSV IPC section */

#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/utsname.h>
#include <stdio.h>

char *getwd (), *getcwd (), *getenv ();
struct utsname system_name;

main (argc, argv)
     int argc;
     char **argv;
{
  int s;
  key_t key;
  /* Size of text allocated in MSGP.  */
  int size_allocated = BUFSIZ;
  /* Amount of text used in MSGP.  */
  int used;
  struct msgbuf *msgp
    = (struct msgbuf *) malloc (sizeof (struct msgbuf) + size_allocated);
  struct msqid_ds * msg_st;
  char *homedir, buf[BUFSIZ];
  char gwdirb[BUFSIZ];
  char *cwd;
  char *temp;
  char *progname = argv[0];

  if (argc < 2)
    {
      fprintf (stderr, "Usage: %s [+linenumber] filename\n", argv[0]);
      exit (1);
    }

  /*
   * Create a message queue using ~/.emacs-server as the path for ftok
   */
  if ((homedir = getenv ("HOME")) == NULL)
    {
      fprintf (stderr, "%s: No home directory\n", argv[0]);
      exit (1);
    }
  strcpy (buf, homedir);
#ifndef HAVE_LONG_FILE_NAMES
  /* If file names are short, we can't fit the host name.  */
  strcat (buf, "/.emacs-server");
#else
  strcat (buf, "/.emacs-server-");
  uname (&system_name);
  strcat (buf, system_name.nodename);
#endif
  creat (buf, 0600);
  key = ftok (buf, 1);	/* unlikely to be anyone else using it */
  s = msgget (key, 0600 | IPC_CREAT);
  if (s == -1)
    {
      fprintf (stderr, "%s: ", argv[0]);
      perror ("msgget");
      exit (1);
    }

  /* Determine working dir, so we can prefix it to all the arguments.  */
#ifdef BSD
  temp = getwd (gwdirb);
#else
  temp = getcwd (gwdirb, sizeof gwdirb);
#endif

  cwd = gwdirb;
  if (temp != 0)
    {
      /* On some systems, cwd can look like `@machine/...';
	 ignore everything before the first slash in such a case.  */
      while (*cwd && *cwd != '/')
	cwd++;
      strcat (cwd, "/");
    }
  else
    {
      fprintf (stderr, "%s: %s\n", argv[0], cwd);
      exit (1);
    }

  msgp->mtext[0] = 0;
  used = 0;
  argc--; argv++;
  while (argc)
    {
      int need_cwd = 0;
      char *modified_arg = argv[0];
      if (*modified_arg == '+')
	{
	  char *p = modified_arg + 1;
	  while (*p >= '0' && *p <= '9') p++;
	  if (*p != 0)
	    need_cwd = 1;
	}
      else if (*modified_arg != '/')
	need_cwd = 1;

      if (need_cwd)
	used += strlen (cwd);
      used += strlen (modified_arg) + 1;
      while (used + 2 > size_allocated)
	{
	  size_allocated *= 2;
	  msgp = (struct msgbuf *) realloc (msgp,
					    (sizeof (struct msgbuf)
					     + size_allocated));
	}

      if (need_cwd)
	strcat (msgp->mtext, cwd);

      strcat (msgp->mtext, modified_arg);
      strcat (msgp->mtext, " ");
      argv++; argc--;
    }
  strcat (msgp->mtext, "\n");
#ifdef HPUX /* HPUX has a bug.  */
  if (strlen (msgp->mtext) >= 512)
    {
      fprintf (stderr, "%s: args too long for msgsnd\n", progname);
      exit (1);
    }
#endif
  msgp->mtype = 1;
  if (msgsnd (s, msgp, strlen (msgp->mtext)+1, 0) < 0)
    {
      fprintf (stderr, "%s: ", progname);
      perror ("msgsnd");
      exit (1);
    }
  /*
   * Now, wait for an answer
   */
  printf ("Waiting for Emacs...");
  fflush (stdout);

  msgrcv (s, msgp, BUFSIZ, getpid (), 0);	/* wait for anything back */
  strcpy (buf, msgp->mtext);

  printf ("\n");
  if (*buf)
    printf ("%s\n", buf);
  exit (0);
}

#endif /* HAVE_SYSVIPC */

#endif /* HAVE_SOCKETS or HAVE_SYSVIPC */

#ifndef HAVE_STRERROR
char *
strerror (errnum)
     int errnum;
{
  extern char *sys_errlist[];
  extern int sys_nerr;

  if (errnum >= 0 && errnum < sys_nerr)
    return sys_errlist[errnum];
  return (char *) "Unknown error";
}

#endif /* ! HAVE_STRERROR */