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67 lines
2.0 KiB
Plaintext
67 lines
2.0 KiB
Plaintext
# serial 9
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# See if we need to provide futimens 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_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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AC_CHECK_FUNCS_ONCE([futimens])
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if test $ac_cv_func_futimens = no; then
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HAVE_FUTIMENS=0
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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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struct stat st;
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if (fd < 0) 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) return 2;
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if (errno != EBADF) return 3;
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if (futimens (fd, ts)) return 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)) return 5;
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if (fstat (fd, &st)) return 6;
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if (st.st_ctime < st.st_atime) return 7;
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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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