94 lines
3 KiB
Text
94 lines
3 KiB
Text
# futimens.m4
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# serial 12
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dnl Copyright (C) 2009-2025 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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dnl This file is offered as-is, without any warranty.
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# See if we need to provide futimens replacement.
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# Written by Eric Blake.
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AC_DEFUN([gl_FUNC_FUTIMENS],
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[
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AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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gl_CHECK_FUNCS_ANDROID([futimens], [[#include <sys/stat.h>]])
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if test $ac_cv_func_futimens = no; then
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HAVE_FUTIMENS=0
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case "$gl_cv_onwards_func_futimens" in
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future*) REPLACE_FUTIMENS=1 ;;
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esac
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else
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AC_CACHE_CHECK([whether futimens works],
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[gl_cv_func_futimens_works],
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[AC_RUN_IFELSE([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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#include <errno.h>
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]GL_MDA_DEFINES],
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[[struct timespec ts[2];
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int fd = creat ("conftest.file", 0600);
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int result = 0;
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struct stat st;
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if (fd < 0)
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return 1;
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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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errno = 0;
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if (futimens (AT_FDCWD, NULL) == 0 || errno != EBADF)
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result |= 2;
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if (futimens (fd, ts))
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result |= 4;
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sleep (1);
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ts[0].tv_nsec = UTIME_NOW;
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ts[1].tv_nsec = UTIME_OMIT;
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if (futimens (fd, ts))
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result |= 8;
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if (fstat (fd, &st))
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result |= 16;
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if (st.st_ctime < st.st_atime)
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result |= 32;
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enum
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{
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BILLION = 1000 * 1000 * 1000,
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/* Bogus positive and negative tv_nsec values closest to valid
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range, but without colliding with UTIME_NOW or UTIME_OMIT. */
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UTIME_BOGUS_POS = BILLION + ((UTIME_NOW == BILLION || UTIME_OMIT == BILLION)
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? (1 + (UTIME_NOW == BILLION + 1)
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+ (UTIME_OMIT == BILLION + 1))
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: 0)
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};
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ts[0].tv_sec = 1;
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ts[0].tv_nsec = UTIME_BOGUS_POS;
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ts[1].tv_sec = 1;
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ts[1].tv_nsec = 0;
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if (futimens (fd, ts) == 0)
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result |= 64;
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return result;
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]])],
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[gl_cv_func_futimens_works=yes],
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[gl_cv_func_futimens_works=no],
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[case "$host_os" in
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# Guess no on glibc systems.
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*-gnu* | gnu*) gl_cv_func_futimens_works="guessing no" ;;
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# Guess no on musl systems.
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*-musl*) gl_cv_func_futimens_works="guessing no" ;;
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# Guess yes otherwise.
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*) gl_cv_func_futimens_works="guessing yes" ;;
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esac
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])
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rm -f conftest.file])
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case "$gl_cv_func_futimens_works" in
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*yes) ;;
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*)
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REPLACE_FUTIMENS=1
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;;
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esac
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fi
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])
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