pipe: Set errno upon failure.

[gnulib.git] / m4 / pipe.m4

diff --git a/m4/pipe.m4 b/m4/pipe.m4
index 83f2868..401881c 100644 (file)
--- a/m4/pipe.m4
+++ b/m4/pipe.m4
@@ -1,24 +1,12 @@
-# pipe.m4 serial 3
-dnl Copyright (C) 2004, 2008, 2009 Free Software Foundation, Inc.
+# pipe.m4 serial 4
+dnl Copyright (C) 2004, 2008, 2009, 2010 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],
 [
-  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
-    ])
 ])