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dnl Copyright (C) 2003-2011 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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dnl Prerequisites of lib/utimens.c.
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AC_REQUIRE([gl_FUNC_UTIMES])
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AC_REQUIRE([gl_CHECK_TYPE_STRUCT_TIMESPEC])
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AC_REQUIRE([gl_CHECK_TYPE_STRUCT_UTIMBUF])
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AC_CHECK_FUNCS_ONCE([futimes futimesat futimens utimensat lutimes])
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if test $ac_cv_func_futimens = no && test $ac_cv_func_futimesat = yes; then
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dnl FreeBSD 8.0-rc2 mishandles futimesat(fd,NULL,time). It is not
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dnl standardized, but Solaris implemented it first and uses it as
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dnl its only means to set fd time.
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AC_CACHE_CHECK([whether futimesat handles NULL file],
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[gl_cv_func_futimesat_works],
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AC_RUN_IFELSE([AC_LANG_PROGRAM([[
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#include <sys/times.h>
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]], [[ int fd = open ("conftest.file", O_RDWR);
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if (futimesat (fd, NULL, NULL)) return 2;
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[gl_cv_func_futimesat_works=yes],
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[gl_cv_func_futimesat_works=no],
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[gl_cv_func_futimesat_works="guessing no"])
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if test "$gl_cv_func_futimesat_works" != yes; then
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AC_DEFINE([FUTIMESAT_NULL_BUG], [1],
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[Define to 1 if futimesat mishandles a NULL file name.])