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# Detect some bugs in glibc's implementation of utimes.
# serial 8
dnl Copyright (C) 2003-2005, 2009-2021 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_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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>
#include <errno.h>
]GL_MDA_DEFINES[
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";
/* On OS/2, file timestamps must be on or after 1980 in local time,
with an even number of seconds. */
static struct timeval timeval[2] = {{315620000 + 10, 10},
{315620000 + 1000000, 999998}};
/* 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
&& (errno != EACCES
/* OS/2 kLIBC utimes fails on opened files. */
|| close (fd) != 0
|| utimes (file, timeval) != 0
|| (fd = open (file, O_WRONLY)) < 0))
result |= 2;
else if (utimes (file, NULL) != 0
&& (errno != EACCES
/* OS/2 kLIBC utimes fails on opened files. */
|| close (fd) != 0
|| utimes (file, NULL) != 0
|| (fd = open (file, O_WRONLY)) < 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],
[case "$host_os" in
# Guess yes on musl systems.
*-musl*) gl_cv_func_working_utimes="guessing yes" ;;
# Guess no on native Windows.
mingw*) gl_cv_func_working_utimes="guessing no" ;;
*) gl_cv_func_working_utimes="$gl_cross_guess_normal" ;;
esac
])
])
case "$gl_cv_func_working_utimes" in
*yes)
AC_DEFINE([HAVE_WORKING_UTIMES], [1], [Define if utimes works properly.])
;;
esac
])
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