| 1 | # Detect some bugs in glibc's implementation of utimes.
|
|---|
| 2 |
|
|---|
| 3 | dnl Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
|
|---|
| 4 | dnl This file is free software; the Free Software Foundation
|
|---|
| 5 | dnl gives unlimited permission to copy and/or distribute it,
|
|---|
| 6 | dnl with or without modifications, as long as this notice is preserved.
|
|---|
| 7 |
|
|---|
| 8 | # See if we need to work around bugs in glibc's implementation of
|
|---|
| 9 | # utimes from 2003-07-12 to 2003-09-17.
|
|---|
| 10 | # First, there was a bug that would make utimes set mtime
|
|---|
| 11 | # and atime to zero (1970-01-01) unconditionally.
|
|---|
| 12 | # Then, there was code to round rather than truncate.
|
|---|
| 13 | # Then, there was an implementation (sparc64, Linux-2.4.28, glibc-2.3.3)
|
|---|
| 14 | # that didn't honor the NULL-means-set-to-current-time semantics.
|
|---|
| 15 | # Finally, there was also a version of utimes that failed on read-only
|
|---|
| 16 | # files, while utime worked fine (linux-2.2.20, glibc-2.2.5).
|
|---|
| 17 | #
|
|---|
| 18 | # From Jim Meyering, with suggestions from Paul Eggert.
|
|---|
| 19 |
|
|---|
| 20 | AC_DEFUN([gl_FUNC_UTIMES],
|
|---|
| 21 | [
|
|---|
| 22 | AC_CACHE_CHECK([determine whether the utimes function works],
|
|---|
| 23 | gl_cv_func_working_utimes,
|
|---|
| 24 | [
|
|---|
| 25 | AC_RUN_IFELSE([AC_LANG_SOURCE([[
|
|---|
| 26 | #include <sys/types.h>
|
|---|
| 27 | #include <sys/stat.h>
|
|---|
| 28 | #include <fcntl.h>
|
|---|
| 29 | #include <sys/time.h>
|
|---|
| 30 | #include <time.h>
|
|---|
| 31 | #include <unistd.h>
|
|---|
| 32 | #include <stdlib.h>
|
|---|
| 33 | #include <stdio.h>
|
|---|
| 34 | #include <utime.h>
|
|---|
| 35 |
|
|---|
| 36 | int
|
|---|
| 37 | main ()
|
|---|
| 38 | {
|
|---|
| 39 | static struct timeval timeval[2] = {{9, 10}, {999999, 999999}};
|
|---|
| 40 | struct stat sbuf;
|
|---|
| 41 | char const *file = "conftest.utimes";
|
|---|
| 42 | FILE *f;
|
|---|
| 43 | time_t now;
|
|---|
| 44 | int fd;
|
|---|
| 45 |
|
|---|
| 46 | int ok = ((f = fopen (file, "w"))
|
|---|
| 47 | && fclose (f) == 0
|
|---|
| 48 | && utimes (file, timeval) == 0
|
|---|
| 49 | && lstat (file, &sbuf) == 0
|
|---|
| 50 | && sbuf.st_atime == timeval[0].tv_sec
|
|---|
| 51 | && sbuf.st_mtime == timeval[1].tv_sec);
|
|---|
| 52 | unlink (file);
|
|---|
| 53 | if (!ok)
|
|---|
| 54 | exit (1);
|
|---|
| 55 |
|
|---|
| 56 | ok =
|
|---|
| 57 | ((f = fopen (file, "w"))
|
|---|
| 58 | && fclose (f) == 0
|
|---|
| 59 | && time (&now) != (time_t)-1
|
|---|
| 60 | && utimes (file, NULL) == 0
|
|---|
| 61 | && lstat (file, &sbuf) == 0
|
|---|
| 62 | && now - sbuf.st_atime <= 2
|
|---|
| 63 | && now - sbuf.st_mtime <= 2);
|
|---|
| 64 | unlink (file);
|
|---|
| 65 | if (!ok)
|
|---|
| 66 | exit (1);
|
|---|
| 67 |
|
|---|
| 68 | ok = (0 <= (fd = open (file, O_WRONLY|O_CREAT, 0444))
|
|---|
| 69 | && close (fd) == 0
|
|---|
| 70 | && utimes (file, NULL) == 0);
|
|---|
| 71 | unlink (file);
|
|---|
| 72 |
|
|---|
| 73 | exit (!ok);
|
|---|
| 74 | }
|
|---|
| 75 | ]])],
|
|---|
| 76 | [gl_cv_func_working_utimes=yes],
|
|---|
| 77 | [gl_cv_func_working_utimes=no],
|
|---|
| 78 | [gl_cv_func_working_utimes=no])])
|
|---|
| 79 |
|
|---|
| 80 | if test $gl_cv_func_working_utimes = yes; then
|
|---|
| 81 | AC_DEFINE([HAVE_WORKING_UTIMES], 1, [Define if utimes works properly. ])
|
|---|
| 82 | fi
|
|---|
| 83 | ])
|
|---|
