-# pipe.m4 serial 3
-dnl Copyright (C) 2004, 2008, 2009 Free Software Foundation, Inc.
+# pipe.m4 serial 2
+dnl Copyright (C) 2010-2013 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_PIPE],
+AC_DEFUN([gl_FUNC_PIPE],
[
- dnl Prerequisites of lib/pipe.h.
- AC_CHECK_HEADERS_ONCE([unistd.h])
- dnl Prerequisites of lib/pipe.c.
- AC_REQUIRE([AC_C_INLINE])
- AC_REQUIRE([AC_TYPE_MODE_T])
- AC_REQUIRE([AC_FUNC_FORK])
- AC_CHECK_FUNC([posix_spawn],
- [gl_POSIX_SPAWN_WORKS
- case "$gl_cv_func_posix_spawn_works" in
- *yes)
- AC_DEFINE([HAVE_POSIX_SPAWN], [1],
- [Define if you have the posix_spawn() function and it works.])
- ;;
- esac
- ])
+ AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+
+ AC_CHECK_FUNCS_ONCE([pipe])
+ if test $ac_cv_func_pipe != yes; then
+ HAVE_PIPE=0
+ fi
])