summaryrefslogtreecommitdiff
path: root/include/uapi/linux/mqueue.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/uapi/linux/mqueue.h')
-rw-r--r--include/uapi/linux/mqueue.h53
1 files changed, 53 insertions, 0 deletions
diff --git a/include/uapi/linux/mqueue.h b/include/uapi/linux/mqueue.h
new file mode 100644
index 000000000000..8b5a79615fbf
--- /dev/null
+++ b/include/uapi/linux/mqueue.h
@@ -0,0 +1,53 @@
+/* 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
+/* per-uid limit of kernel memory used by mqueue, in bytes */
+#define MQ_BYTES_MAX 819200
+
+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 */
+ long __reserved[4]; /* ignored for input, zeroed for output */
+};
+
+/*
+ * SIGEV_THREAD implementation:
+ * SIGEV_THREAD must be implemented in user space. If SIGEV_THREAD is passed
+ * to mq_notify, then
+ * - sigev_signo must be the file descriptor of an AF_NETLINK socket. It's not
+ * necessary that the socket is bound.
+ * - sigev_value.sival_ptr must point to a cookie that is NOTIFY_COOKIE_LEN
+ * bytes long.
+ * If the notification is triggered, then the cookie is sent to the netlink
+ * socket. The last byte of the cookie is replaced with the NOTIFY_?? codes:
+ * NOTIFY_WOKENUP if the notification got triggered, NOTIFY_REMOVED if it was
+ * removed, either due to a close() on the message queue fd or due to a
+ * mq_notify() that removed the notification.
+ */
+#define NOTIFY_NONE 0
+#define NOTIFY_WOKENUP 1
+#define NOTIFY_REMOVED 2
+
+#define NOTIFY_COOKIE_LEN 32
+
+#endif