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# popen.m4 serial 6
dnl Copyright (C) 2009-2023 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_POPEN],
[
AC_REQUIRE([gl_STDIO_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CHECK_FUNCS_ONCE([popen])
if test $ac_cv_func_popen = no; then
HAVE_POPEN=0
else
AC_CACHE_CHECK([whether popen works with closed stdin],
[gl_cv_func_popen_works],
[
AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stdio.h>]],
[[int result = 0;
FILE *child;
fclose (stdin);
fclose (stdout);
child = popen ("echo a", "r");
if (fgetc (child) != 'a')
result |= 1;
if (pclose (child) != 0)
result |= 2;
return result;
]])],
[gl_cv_func_popen_works=yes],
[gl_cv_func_popen_works=no],
[case "$host_os" in
# For now, only cygwin 1.5 or older is known to be broken.
cygwin*) gl_cv_func_popen_works="guessing no" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_popen_works="guessing yes" ;;
*) gl_cv_func_popen_works="guessing yes" ;;
esac
])
])
case "$gl_cv_func_popen_works" in
*yes) ;;
*) REPLACE_POPEN=1 ;;
esac
fi
])
# Prerequisites of lib/popen.c.
AC_DEFUN([gl_PREREQ_POPEN],
[
:
])
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