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
|
# Detect some bugs in glibc's implementation of utimes.
# serial 3
dnl Copyright (C) 2003-2005, 2009-2013 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
# See if we need to work around bugs in glibc's implementation of
# utimes from 2003-07-12 to 2003-09-17.
# First, there was a bug that would make utimes set mtime
# and atime to zero (1970-01-01) unconditionally.
# Then, there was code to round rather than truncate.
# Then, there was an implementation (sparc64, Linux-2.4.28, glibc-2.3.3)
# that didn't honor the NULL-means-set-to-current-time semantics.
# Finally, there was also a version of utimes that failed on read-only
# files, while utime worked fine (linux-2.2.20, glibc-2.2.5).
#
# From Jim Meyering, with suggestions from Paul Eggert.
AC_DEFUN([gl_FUNC_UTIMES],
[
AC_CACHE_CHECK([whether the utimes function works],
[gl_cv_func_working_utimes],
[
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/time.h>
#include <time.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <utime.h>
static int
inorder (time_t a, time_t b, time_t c)
{
return a <= b && b <= c;
}
int
main ()
{
int result = 0;
char const *file = "conftest.utimes";
static struct timeval timeval[2] = {{9, 10}, {999999, 999999}};
/* Test whether utimes() essentially works. */
{
struct stat sbuf;
FILE *f = fopen (file, "w");
if (f == NULL)
result |= 1;
else if (fclose (f) != 0)
result |= 1;
else if (utimes (file, timeval) != 0)
result |= 2;
else if (lstat (file, &sbuf) != 0)
result |= 1;
else if (!(sbuf.st_atime == timeval[0].tv_sec
&& sbuf.st_mtime == timeval[1].tv_sec))
result |= 4;
if (unlink (file) != 0)
result |= 1;
}
/* Test whether utimes() with a NULL argument sets the file's timestamp
to the current time. Use 'fstat' as well as 'time' to
determine the "current" time, to accommodate NFS file systems
if there is a time skew between the host and the NFS server. */
{
int fd = open (file, O_WRONLY|O_CREAT, 0644);
if (fd < 0)
result |= 1;
else
{
time_t t0, t2;
struct stat st0, st1, st2;
if (time (&t0) == (time_t) -1)
result |= 1;
else if (fstat (fd, &st0) != 0)
result |= 1;
else if (utimes (file, timeval) != 0)
result |= 2;
else if (utimes (file, NULL) != 0)
result |= 8;
else if (fstat (fd, &st1) != 0)
result |= 1;
else if (write (fd, "\n", 1) != 1)
result |= 1;
else if (fstat (fd, &st2) != 0)
result |= 1;
else if (time (&t2) == (time_t) -1)
result |= 1;
else
{
int m_ok_POSIX = inorder (t0, st1.st_mtime, t2);
int m_ok_NFS = inorder (st0.st_mtime, st1.st_mtime, st2.st_mtime);
if (! (st1.st_atime == st1.st_mtime))
result |= 16;
if (! (m_ok_POSIX || m_ok_NFS))
result |= 32;
}
if (close (fd) != 0)
result |= 1;
}
if (unlink (file) != 0)
result |= 1;
}
/* Test whether utimes() with a NULL argument works on read-only files. */
{
int fd = open (file, O_WRONLY|O_CREAT, 0444);
if (fd < 0)
result |= 1;
else if (close (fd) != 0)
result |= 1;
else if (utimes (file, NULL) != 0)
result |= 64;
if (unlink (file) != 0)
result |= 1;
}
return result;
}
]])],
[gl_cv_func_working_utimes=yes],
[gl_cv_func_working_utimes=no],
[gl_cv_func_working_utimes=no])])
if test $gl_cv_func_working_utimes = yes; then
AC_DEFINE([HAVE_WORKING_UTIMES], [1], [Define if utimes works properly. ])
fi
])
|
