[PATCH] posix message queues: syscall stubs

From: Manfred Spraul <manfred@colorfullife.com>

Add -ENOSYS stubs for the posix message queue syscalls.  The API is a direct
mapping of the api from the unix spec, with two exceptions:

- mq_close() doesn't exist.  Message queue file descriptors can be closed
  with close().

- mq_notify(SIGEV_THREAD) cannot be implemented in the kernel.  The kernel
  returns a pollable file descriptor .  User space must poll (or read) this
  descriptor and call the notifier function if the file descriptor is
  signaled.

1 files changed, 36 insertions, 0 deletions

diff --git a/include/linux/mqueue.h b/include/linux/mqueue.h
new file mode 100644
index 000000000000..c0c5fcc89f0e
--- /dev/null
+++ b/include/linux/mqueue.h
@@ -0,0 +1,36 @@
+/* Copyright (C) 2003 Krzysztof Benedyczak & Michal Wronski
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   It 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this software; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _LINUX_MQUEUE_H
+#define _LINUX_MQUEUE_H
+
+#define MQ_PRIO_MAX 	32768
+
+typedef int mqd_t;
+
+struct mq_attr {
+	long	mq_flags;	/* message queue flags			*/
+	long	mq_maxmsg;	/* maximum number of messages		*/
+	long	mq_msgsize;	/* maximum message size			*/
+	long	mq_curmsgs;	/* number of messages currently queued	*/
+};
+
+#define NOTIFY_NONE	0
+#define NOTIFY_WOKENUP	1
+#define NOTIFY_REMOVED	2
+
+#endif