| # pipe2.m4 serial 2 |
| dnl Copyright (C) 2009-2019 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_PIPE2], |
| [ |
| AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) |
| |
| dnl Persuade glibc <unistd.h> to declare pipe2(). |
| AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) |
| |
| AC_CHECK_FUNCS_ONCE([pipe2]) |
| if test $ac_cv_func_pipe2 != yes; then |
| HAVE_PIPE2=0 |
| fi |
| ]) |
