pipe-posix: Make it work in C++ mode.

* lib/unistd.in.h: Don't include <io.h>, <fcntl.h> for pipe.
(pipe): Use common idiom, not a macro definition.
* lib/pipe.c: New file.
* m4/pipe.m4: New file.
* modules/pipe-posix (Description): Enhance.
(Files): Add lib/pipe.c, m4/pipe.m4.
(configure.ac): Invoke gl_FUNC_PIPE.
* m4/unistd_h.m4 (gl_UNISTD_H_DEFAULTS): Initialize HAVE_PIPE.
* modules/unistd (Makefile.am): Substitute HAVE_PIPE.
* tests/test-unistd-c++.cc: Check the signature of pipe.

1 files changed, 42 insertions, 0 deletions

diff --git a/lib/pipe.c b/lib/pipe.c
new file mode 100644
index 0000000000..e002ad2e60
--- /dev/null
+++ b/lib/pipe.c
@@ -0,0 +1,42 @@
+/* Create a pipe.
+   Copyright (C) 2009-2010 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License along
+   with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <unistd.h>
+
+#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+/* Native Woe32 API.  */
+
+/* Get _pipe().  */
+# include <io.h>
+
+/* Get _O_BINARY.  */
+# include <fcntl.h>
+
+int
+pipe (int fd[2])
+{
+  return _pipe (fd, 4096, _O_BINARY);
+}
+
+#else
+
+# error "This platform lacks a pipe function, and Gnulib doesn't provide a replacement. This is a bug in Gnulib."
+
+#endif