mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-22 07:09:54 +00:00
113 lines
3.7 KiB
Plaintext
113 lines
3.7 KiB
Plaintext
# utimensat.m4
|
|
# serial 12
|
|
dnl Copyright (C) 2009-2024 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 provide utimensat replacement.
|
|
|
|
# Written by Eric Blake.
|
|
|
|
AC_DEFUN([gl_FUNC_UTIMENSAT],
|
|
[
|
|
AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
|
|
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
|
|
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
|
|
gl_CHECK_FUNCS_ANDROID([utimensat], [[#include <sys/stat.h>]])
|
|
if test $ac_cv_func_utimensat = no; then
|
|
HAVE_UTIMENSAT=0
|
|
case "$gl_cv_onwards_func_utimensat" in
|
|
future*) REPLACE_UTIMENSAT=1 ;;
|
|
esac
|
|
else
|
|
AC_CACHE_CHECK([whether utimensat works],
|
|
[gl_cv_func_utimensat_works],
|
|
[AC_RUN_IFELSE(
|
|
[AC_LANG_PROGRAM([[
|
|
#include <fcntl.h>
|
|
#include <sys/stat.h>
|
|
#include <unistd.h>
|
|
]GL_MDA_DEFINES],
|
|
[[int result = 0;
|
|
const char *f = "conftest.file";
|
|
if (close (creat (f, 0600)))
|
|
return 1;
|
|
/* Test whether a trailing slash is handled correctly.
|
|
This fails on AIX 7.2. */
|
|
{
|
|
struct timespec ts[2];
|
|
ts[0].tv_sec = 345183300; ts[0].tv_nsec = 0;
|
|
ts[1] = ts[0];
|
|
if (utimensat (AT_FDCWD, "conftest.file/", ts, 0) == 0)
|
|
result |= 2;
|
|
}
|
|
/* Test whether the AT_SYMLINK_NOFOLLOW flag is supported. */
|
|
{
|
|
if (utimensat (AT_FDCWD, f, NULL, AT_SYMLINK_NOFOLLOW))
|
|
result |= 4;
|
|
}
|
|
/* Test whether UTIME_NOW and UTIME_OMIT work. */
|
|
{
|
|
struct timespec ts[2];
|
|
ts[0].tv_sec = 1;
|
|
ts[0].tv_nsec = UTIME_OMIT;
|
|
ts[1].tv_sec = 1;
|
|
ts[1].tv_nsec = UTIME_NOW;
|
|
if (utimensat (AT_FDCWD, f, ts, 0))
|
|
result |= 8;
|
|
}
|
|
sleep (1);
|
|
{
|
|
struct stat st;
|
|
struct timespec ts[2];
|
|
ts[0].tv_sec = 1;
|
|
ts[0].tv_nsec = UTIME_NOW;
|
|
ts[1].tv_sec = 1;
|
|
ts[1].tv_nsec = UTIME_OMIT;
|
|
if (utimensat (AT_FDCWD, f, ts, 0))
|
|
result |= 16;
|
|
if (stat (f, &st))
|
|
result |= 32;
|
|
else if (st.st_ctime < st.st_atime)
|
|
result |= 64;
|
|
}
|
|
return result;
|
|
]])],
|
|
[gl_cv_func_utimensat_works=yes],
|
|
[case $? in
|
|
2) gl_cv_func_utimensat_works='nearly' ;;
|
|
*) gl_cv_func_utimensat_works=no ;;
|
|
esac
|
|
],
|
|
[case "$host_os" in
|
|
# Guess yes on Linux or glibc systems.
|
|
linux-* | linux | *-gnu* | gnu*)
|
|
gl_cv_func_utimensat_works="guessing yes" ;;
|
|
# Guess yes on systems that emulate the Linux system calls.
|
|
midipix*)
|
|
gl_cv_func_utimensat_works="guessing yes" ;;
|
|
# Guess 'nearly' on AIX.
|
|
aix*)
|
|
gl_cv_func_utimensat_works="guessing nearly" ;;
|
|
# If we don't know, obey --enable-cross-guesses.
|
|
*)
|
|
gl_cv_func_utimensat_works="$gl_cross_guess_normal" ;;
|
|
esac
|
|
])
|
|
])
|
|
case "$gl_cv_func_utimensat_works" in
|
|
*yes)
|
|
;;
|
|
*nearly)
|
|
AC_DEFINE([HAVE_NEARLY_WORKING_UTIMENSAT], [1],
|
|
[Define to 1 if utimensat works, except for the trailing slash handling.])
|
|
REPLACE_UTIMENSAT=1
|
|
;;
|
|
*)
|
|
REPLACE_UTIMENSAT=1
|
|
;;
|
|
esac
|
|
fi
|
|
])
|