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# See if we need to provide futimens replacement.
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dnl Copyright (C) 2009-2011 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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AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
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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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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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]], [[struct timespec ts[2] = { { 1, UTIME_OMIT }, { 1, UTIME_NOW } };
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int fd = creat ("conftest.file", 0600);
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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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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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dnl FIXME: simplify this in 2012, when file system bugs are no longer common
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
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/* The Linux kernel added futimens in 2.6.22, but has bugs with UTIME_OMIT
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in several file systems as recently as 2.6.32. Always replace futimens
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to support older kernels. */
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[gl_cv_func_futimens_works=yes],
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[gl_cv_func_futimens_works="needs runtime check"])],
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[gl_cv_func_futimens_works=no],
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[gl_cv_func_futimens_works="guessing no"])
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if test "$gl_cv_func_futimens_works" != yes; then