1 dnl Copyright (C) 2003-2017 Free Software Foundation, Inc.
2 dnl This file is free software; the Free Software Foundation
3 dnl gives unlimited permission to copy and/or distribute it,
4 dnl with or without modifications, as long as this notice is preserved.
10 dnl Prerequisites of lib/utimens.c.
11 AC_REQUIRE([gl_FUNC_UTIMES])
12 AC_REQUIRE([gl_CHECK_TYPE_STRUCT_TIMESPEC])
13 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
14 AC_CHECK_FUNCS_ONCE([futimes futimesat futimens utimensat lutimes])
16 if test $ac_cv_func_futimens = no && test $ac_cv_func_futimesat = yes; then
17 dnl FreeBSD 8.0-rc2 mishandles futimesat(fd,NULL,time). It is not
18 dnl standardized, but Solaris implemented it first and uses it as
19 dnl its only means to set fd time.
20 AC_CACHE_CHECK([whether futimesat handles NULL file],
21 [gl_cv_func_futimesat_works],
23 AC_RUN_IFELSE([AC_LANG_PROGRAM([[
25 #include <sys/times.h>
27 ]], [[ int fd = open ("conftest.file", O_RDWR);
29 if (futimesat (fd, NULL, NULL)) return 2;
31 [gl_cv_func_futimesat_works=yes],
32 [gl_cv_func_futimesat_works=no],
34 # Guess yes on glibc systems.
35 *-gnu*) gl_cv_func_futimesat_works="guessing yes" ;;
36 # If we don't know, assume the worst.
37 *) gl_cv_func_futimesat_works="guessing no" ;;
41 case "$gl_cv_func_futimesat_works" in
44 AC_DEFINE([FUTIMESAT_NULL_BUG], [1],
45 [Define to 1 if futimesat mishandles a NULL file name.])