2 # See if we need to provide utimensat 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_UTIMENSAT],
13 AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
14 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
15 AC_CHECK_FUNCS_ONCE([utimensat])
16 if test $ac_cv_func_utimensat = no; then
18 AC_LIBOBJ([utimensat])
20 AC_CACHE_CHECK([whether utimensat works],
21 [gl_cv_func_utimensat_works],
22 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
26 /* The Linux kernel added utimensat in 2.6.22, but it had bugs until 2.6.26.
27 Always replace utimensat to support older kernels. */
30 ]], [[struct timespec ts[2] = { { 1, UTIME_OMIT }, { 1, UTIME_OMIT } };
31 return utimensat (AT_FDCWD, ".", NULL, AT_SYMLINK_NOFOLLOW);]])],
32 [gl_cv_func_utimensat_works=yes],
33 [gl_cv_func_utimensat_works="needs runtime check"],
34 [gl_cv_func_utimensat_works="guessing no"])])
35 if test "$gl_cv_func_utimensat_works" != yes; then
37 AC_LIBOBJ([utimensat])