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- /* 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 {
- __kernel_long_t mq_flags; /* message queue flags */
- __kernel_long_t mq_maxmsg; /* maximum number of messages */
- __kernel_long_t mq_msgsize; /* maximum message size */
- __kernel_long_t mq_curmsgs; /* number of messages currently queued */
- __kernel_long_t __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
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