| # pipe2.m4 serial 2 | |
| 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_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 | |
| ]) | |