projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 | ||
| 1da177e4 LT |
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 |