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-rw-r--r--m4/utimens.m452
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diff --git a/m4/utimens.m4 b/m4/utimens.m4
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+dnl Copyright (C) 2003-2022 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl serial 11
+
+AC_DEFUN([gl_UTIMENS],
+[
+ dnl Prerequisites of lib/utimens.c.
+ AC_REQUIRE([gl_FUNC_UTIMES])
+ AC_REQUIRE([gl_CHECK_TYPE_STRUCT_TIMESPEC])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CHECK_FUNCS_ONCE([futimes futimesat futimens utimensat lutimes])
+
+ if test $ac_cv_func_futimens = no && test $ac_cv_func_futimesat = yes; then
+ dnl FreeBSD 8.0-rc2 mishandles futimesat(fd,NULL,time). It is not
+ dnl standardized, but Solaris implemented it first and uses it as
+ dnl its only means to set fd time.
+ AC_CACHE_CHECK([whether futimesat handles NULL file],
+ [gl_cv_func_futimesat_works],
+ [touch conftest.file
+ AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+#include <stddef.h>
+#include <sys/times.h>
+#include <fcntl.h>
+]GL_MDA_DEFINES],
+ [[int fd = open ("conftest.file", O_RDWR);
+ if (fd < 0) return 1;
+ if (futimesat (fd, NULL, NULL)) return 2;
+ ]])],
+ [gl_cv_func_futimesat_works=yes],
+ [gl_cv_func_futimesat_works=no],
+ [case "$host_os" in
+ # Guess yes on Linux systems.
+ linux-* | linux) gl_cv_func_futimesat_works="guessing yes" ;;
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_futimesat_works="guessing yes" ;;
+ # If we don't know, obey --enable-cross-guesses.
+ *) gl_cv_func_futimesat_works="$gl_cross_guess_normal" ;;
+ esac
+ ])
+ rm -f conftest.file])
+ case "$gl_cv_func_futimesat_works" in
+ *yes) ;;
+ *)
+ AC_DEFINE([FUTIMESAT_NULL_BUG], [1],
+ [Define to 1 if futimesat mishandles a NULL file name.])
+ ;;
+ esac
+ fi
+])