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TOMOYO Linux Cross Reference
Linux/include/linux/mqueue.h

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  1 /* Copyright (C) 2003 Krzysztof Benedyczak & Michal Wronski
  2 
  3    This program is free software; you can redistribute it and/or
  4    modify it under the terms of the GNU Lesser General Public
  5    License as published by the Free Software Foundation; either
  6    version 2.1 of the License, or (at your option) any later version.
  7 
  8    It is distributed in the hope that it will be useful,
  9    but WITHOUT ANY WARRANTY; without even the implied warranty of
 10    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 11    Lesser General Public License for more details.
 12 
 13    You should have received a copy of the GNU Lesser General Public
 14    License along with this software; if not, write to the Free
 15    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 16    02111-1307 USA.  */
 17 
 18 #ifndef _LINUX_MQUEUE_H
 19 #define _LINUX_MQUEUE_H
 20 
 21 #define MQ_PRIO_MAX     32768
 22 /* per-uid limit of kernel memory used by mqueue, in bytes */
 23 #define MQ_BYTES_MAX    819200
 24 
 25 struct mq_attr {
 26         long    mq_flags;       /* message queue flags                  */
 27         long    mq_maxmsg;      /* maximum number of messages           */
 28         long    mq_msgsize;     /* maximum message size                 */
 29         long    mq_curmsgs;     /* number of messages currently queued  */
 30         long    __reserved[4];  /* ignored for input, zeroed for output */
 31 };
 32 
 33 /*
 34  * SIGEV_THREAD implementation:
 35  * SIGEV_THREAD must be implemented in user space. If SIGEV_THREAD is passed
 36  * to mq_notify, then
 37  * - sigev_signo must be the file descriptor of an AF_NETLINK socket. It's not
 38  *   necessary that the socket is bound.
 39  * - sigev_value.sival_ptr must point to a cookie that is NOTIFY_COOKIE_LEN
 40  *   bytes long.
 41  * If the notification is triggered, then the cookie is sent to the netlink
 42  * socket. The last byte of the cookie is replaced with the NOTIFY_?? codes:
 43  * NOTIFY_WOKENUP if the notification got triggered, NOTIFY_REMOVED if it was
 44  * removed, either due to a close() on the message queue fd or due to a
 45  * mq_notify() that removed the notification.
 46  */
 47 #define NOTIFY_NONE     0
 48 #define NOTIFY_WOKENUP  1
 49 #define NOTIFY_REMOVED  2
 50 
 51 #define NOTIFY_COOKIE_LEN       32
 52 
 53 #endif
 54 

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