Christopher Ferris | 2598113 | 2017-11-14 16:53:49 -0800 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: LGPL-2.1+ WITH Linux-syscall-note */ |
Ben Cheng | 224b54f | 2013-10-15 18:26:18 -0700 | [diff] [blame] | 2 | /* Copyright (C) 2003 Krzysztof Benedyczak & Michal Wronski |
| 3 | |
| 4 | This program is free software; you can redistribute it and/or |
| 5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either |
| 7 | version 2.1 of the License, or (at your option) any later version. |
| 8 | |
| 9 | It is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with this software; if not, write to the Free |
| 16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 17 | 02111-1307 USA. */ |
| 18 | |
| 19 | #ifndef _LINUX_MQUEUE_H |
| 20 | #define _LINUX_MQUEUE_H |
| 21 | |
Christopher Ferris | 0543f74 | 2017-07-26 13:09:46 -0700 | [diff] [blame] | 22 | #include <linux/types.h> |
| 23 | |
Ben Cheng | 224b54f | 2013-10-15 18:26:18 -0700 | [diff] [blame] | 24 | #define MQ_PRIO_MAX 32768 |
| 25 | /* per-uid limit of kernel memory used by mqueue, in bytes */ |
| 26 | #define MQ_BYTES_MAX 819200 |
| 27 | |
| 28 | struct mq_attr { |
Christopher Ferris | e084501 | 2014-07-09 14:58:51 -0700 | [diff] [blame] | 29 | __kernel_long_t mq_flags; /* message queue flags */ |
| 30 | __kernel_long_t mq_maxmsg; /* maximum number of messages */ |
| 31 | __kernel_long_t mq_msgsize; /* maximum message size */ |
| 32 | __kernel_long_t mq_curmsgs; /* number of messages currently queued */ |
| 33 | __kernel_long_t __reserved[4]; /* ignored for input, zeroed for output */ |
Ben Cheng | 224b54f | 2013-10-15 18:26:18 -0700 | [diff] [blame] | 34 | }; |
| 35 | |
| 36 | /* |
| 37 | * SIGEV_THREAD implementation: |
| 38 | * SIGEV_THREAD must be implemented in user space. If SIGEV_THREAD is passed |
| 39 | * to mq_notify, then |
| 40 | * - sigev_signo must be the file descriptor of an AF_NETLINK socket. It's not |
| 41 | * necessary that the socket is bound. |
| 42 | * - sigev_value.sival_ptr must point to a cookie that is NOTIFY_COOKIE_LEN |
| 43 | * bytes long. |
| 44 | * If the notification is triggered, then the cookie is sent to the netlink |
| 45 | * socket. The last byte of the cookie is replaced with the NOTIFY_?? codes: |
| 46 | * NOTIFY_WOKENUP if the notification got triggered, NOTIFY_REMOVED if it was |
| 47 | * removed, either due to a close() on the message queue fd or due to a |
| 48 | * mq_notify() that removed the notification. |
| 49 | */ |
| 50 | #define NOTIFY_NONE 0 |
| 51 | #define NOTIFY_WOKENUP 1 |
| 52 | #define NOTIFY_REMOVED 2 |
| 53 | |
| 54 | #define NOTIFY_COOKIE_LEN 32 |
| 55 | |
| 56 | #endif |