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e2be04c7 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ WITH Linux-syscall-note */ |
1da177e4 LT |
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 | ||
1ca5eebb MF |
22 | #include <linux/types.h> |
23 | ||
1da177e4 LT |
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 { | |
63159f5d L |
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 */ | |
1da177e4 LT |
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 |