3 dnl Copyright (C) 2009-2024 Free Software Foundation, Inc.
4 dnl This file is free software; the Free Software Foundation
5 dnl gives unlimited permission to copy and/or distribute it,
6 dnl with or without modifications, as long as this notice is preserved.
8 AC_DEFUN([gl_FUNC_PIPE2],
10 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
12 dnl Persuade glibc <unistd.h> to declare pipe2().
13 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
15 gl_CHECK_FUNCS_ANDROID([pipe2], [[#include <unistd.h>]])
16 if test $ac_cv_func_pipe2 != yes; then
18 case "$gl_cv_onwards_func_pipe2" in
19 future*) REPLACE_PIPE2=1 ;;