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# pipe2.m4
# serial 4
dnl Copyright (C) 2009-2025 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 This file is offered as-is, without any warranty.
AC_DEFUN([gl_FUNC_PIPE2],
[
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
dnl Persuade glibc <unistd.h> to declare pipe2().
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
gl_CHECK_FUNCS_ANDROID([pipe2], [[#include <unistd.h>]])
if test $ac_cv_func_pipe2 != yes; then
HAVE_PIPE2=0
case "$gl_cv_onwards_func_pipe2" in
future*) REPLACE_PIPE2=1 ;;
esac
else
REPLACE_PIPE2=1
fi
])
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