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106 lines
3.4 KiB
Plaintext
106 lines
3.4 KiB
Plaintext
# serial 9
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# See if we need to provide utimensat replacement.
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dnl Copyright (C) 2009-2021 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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# Written by Eric Blake.
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AC_DEFUN([gl_FUNC_UTIMENSAT],
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[
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AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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AC_CHECK_FUNCS_ONCE([utimensat])
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if test $ac_cv_func_utimensat = no; then
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HAVE_UTIMENSAT=0
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else
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AC_CACHE_CHECK([whether utimensat works],
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[gl_cv_func_utimensat_works],
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[AC_RUN_IFELSE(
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[AC_LANG_PROGRAM([[
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <unistd.h>
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]GL_MDA_DEFINES],
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[[int result = 0;
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const char *f = "conftest.file";
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if (close (creat (f, 0600)))
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return 1;
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/* Test whether a trailing slash is handled correctly.
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This fails on AIX 7.2. */
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{
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struct timespec ts[2];
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ts[0].tv_sec = 345183300; ts[0].tv_nsec = 0;
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ts[1] = ts[0];
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if (utimensat (AT_FDCWD, "conftest.file/", ts, 0) == 0)
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result |= 2;
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}
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/* Test whether the AT_SYMLINK_NOFOLLOW flag is supported. */
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{
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if (utimensat (AT_FDCWD, f, NULL, AT_SYMLINK_NOFOLLOW))
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result |= 4;
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}
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/* Test whether UTIME_NOW and UTIME_OMIT work. */
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{
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struct timespec ts[2];
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ts[0].tv_sec = 1;
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ts[0].tv_nsec = UTIME_OMIT;
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ts[1].tv_sec = 1;
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ts[1].tv_nsec = UTIME_NOW;
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if (utimensat (AT_FDCWD, f, ts, 0))
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result |= 8;
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}
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sleep (1);
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{
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struct stat st;
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struct timespec ts[2];
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ts[0].tv_sec = 1;
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ts[0].tv_nsec = UTIME_NOW;
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ts[1].tv_sec = 1;
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ts[1].tv_nsec = UTIME_OMIT;
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if (utimensat (AT_FDCWD, f, ts, 0))
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result |= 16;
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if (stat (f, &st))
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result |= 32;
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else if (st.st_ctime < st.st_atime)
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result |= 64;
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}
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return result;
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]])],
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[gl_cv_func_utimensat_works=yes],
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[case $? in
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2) gl_cv_func_utimensat_works='nearly' ;;
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*) gl_cv_func_utimensat_works=no ;;
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esac
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],
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[case "$host_os" in
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# Guess yes on Linux or glibc systems.
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linux-* | linux | *-gnu* | gnu*)
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gl_cv_func_utimensat_works="guessing yes" ;;
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# Guess 'nearly' on AIX.
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aix*)
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gl_cv_func_utimensat_works="guessing nearly" ;;
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# If we don't know, obey --enable-cross-guesses.
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*)
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gl_cv_func_utimensat_works="$gl_cross_guess_normal" ;;
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esac
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])
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])
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case "$gl_cv_func_utimensat_works" in
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*yes)
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;;
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*nearly)
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AC_DEFINE([HAVE_NEARLY_WORKING_UTIMENSAT], [1],
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[Define to 1 if utimensat works, except for the trailing slash handling.])
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REPLACE_UTIMENSAT=1
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;;
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*)
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REPLACE_UTIMENSAT=1
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;;
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esac
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fi
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])
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