2 # See if we need to provide futimens replacement.
4 dnl Copyright (C) 2009 Free Software Foundation, Inc.
5 dnl This file is free software; the Free Software Foundation
6 dnl gives unlimited permission to copy and/or distribute it,
7 dnl with or without modifications, as long as this notice is preserved.
9 # Written by Eric Blake.
11 AC_DEFUN([gl_FUNC_FUTIMENS],
13 AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
14 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
15 AC_CHECK_FUNCS_ONCE([futimens])
16 if test $ac_cv_func_futimens = no; then
20 AC_CACHE_CHECK([whether futimens works],
21 [gl_cv_func_futimens_works],
22 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
26 /* The Linux kernel added futimens in 2.6.22, but it had bugs until 2.6.26.
27 Always replace futimens to support older kernels. */
30 ]], [[struct timespec ts[2] = { { 1, UTIME_OMIT }, { 1, UTIME_OMIT } };
31 if (futimens (AT_FDCWD, NULL)) return 1;
32 return futimens (open (".", O_RDONLY), ts);]])],
33 [gl_cv_func_futimens_works=yes],
34 [gl_cv_func_futimens_works="needs runtime check"],
35 [gl_cv_func_futimens_works="guessing no"])])
36 if test "$gl_cv_func_futimens_works" != yes; then