| 1 | /* SPDX-License-Identifier: LGPL-2.1+ WITH Linux-syscall-note */ |
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| 2 | /* Copyright (C) 2003 Krzysztof Benedyczak & Michal Wronski |
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| 3 | |
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| 4 | This program is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | It is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with this software; if not, write to the Free |
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| 16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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| 17 | 02111-1307 USA. */ |
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| 18 | |
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| 19 | #ifndef _LINUX_MQUEUE_H |
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| 20 | #define _LINUX_MQUEUE_H |
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| 21 | |
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| 22 | #include <linux/types.h> |
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| 23 | |
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| 24 | #define MQ_PRIO_MAX 32768 |
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| 25 | /* per-uid limit of kernel memory used by mqueue, in bytes */ |
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| 26 | #define MQ_BYTES_MAX 819200 |
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| 27 | |
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| 28 | struct mq_attr { |
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| 29 | __kernel_long_t mq_flags; /* message queue flags */ |
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| 30 | __kernel_long_t mq_maxmsg; /* maximum number of messages */ |
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| 31 | __kernel_long_t mq_msgsize; /* maximum message size */ |
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| 32 | __kernel_long_t mq_curmsgs; /* number of messages currently queued */ |
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| 33 | __kernel_long_t __reserved[4]; /* ignored for input, zeroed for output */ |
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| 34 | }; |
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| 35 | |
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| 36 | /* |
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| 37 | * SIGEV_THREAD implementation: |
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| 38 | * SIGEV_THREAD must be implemented in user space. If SIGEV_THREAD is passed |
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| 39 | * to mq_notify, then |
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| 40 | * - sigev_signo must be the file descriptor of an AF_NETLINK socket. It's not |
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| 41 | * necessary that the socket is bound. |
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| 42 | * - sigev_value.sival_ptr must point to a cookie that is NOTIFY_COOKIE_LEN |
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| 43 | * bytes long. |
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| 44 | * If the notification is triggered, then the cookie is sent to the netlink |
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| 45 | * socket. The last byte of the cookie is replaced with the NOTIFY_?? codes: |
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| 46 | * NOTIFY_WOKENUP if the notification got triggered, NOTIFY_REMOVED if it was |
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| 47 | * removed, either due to a close() on the message queue fd or due to a |
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| 48 | * mq_notify() that removed the notification. |
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| 49 | */ |
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| 50 | #define NOTIFY_NONE 0 |
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| 51 | #define NOTIFY_WOKENUP 1 |
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| 52 | #define NOTIFY_REMOVED 2 |
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| 53 | |
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| 54 | #define NOTIFY_COOKIE_LEN 32 |
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| 55 | |
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| 56 | #endif |
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| 57 | |
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