Mercurial > gnulib
view m4/freopen.m4 @ 40057:b06060465f09
maint: Run 'make update-copyright'
author | Paul Eggert <eggert@cs.ucla.edu> |
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date | Tue, 01 Jan 2019 00:25:11 +0100 |
parents | 10eb9086bea0 |
children |
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# freopen.m4 serial 6 dnl Copyright (C) 2007-2019 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. AC_DEFUN([gl_FUNC_FREOPEN], [ AC_REQUIRE([gl_STDIO_H_DEFAULTS]) AC_REQUIRE([AC_CANONICAL_HOST]) case "$host_os" in mingw* | pw* | os2*) REPLACE_FREOPEN=1 ;; *) AC_CACHE_CHECK([whether freopen works on closed fds], [gl_cv_func_freopen_works_on_closed], [AC_RUN_IFELSE( [AC_LANG_PROGRAM( [[#include <stdio.h> #include <unistd.h> ]], [[close (0); return !(freopen ("/dev/null", "r", stdin) && getchar () == EOF && !ferror (stdin) && feof (stdin));]])], [gl_cv_func_freopen_works_on_closed=yes], [gl_cv_func_freopen_works_on_closed=no], [case $host_os in *gnu*) gl_cv_func_freopen_works_on_closed="guessing no" ;; *) gl_cv_func_freopen_works_on_closed="guessing yes";; esac])]) case $gl_cv_func_freopen_works_on_closed in *no) REPLACE_FREOPEN=1;; esac esac ]) # Prerequisites of lib/freopen.c. AC_DEFUN([gl_PREREQ_FREOPEN], [:])