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56 lines
2.1 KiB
56 lines
2.1 KiB
/* SPDX-License-Identifier: LGPL-2.1+ WITH Linux-syscall-note */ |
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/* Copyright (C) 2003 Krzysztof Benedyczak & Michal Wronski |
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This program is free software; you can redistribute it and/or |
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modify it under the terms of the GNU Lesser General Public |
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License as published by the Free Software Foundation; either |
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version 2.1 of the License, or (at your option) any later version. |
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It is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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Lesser General Public License for more details. |
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You should have received a copy of the GNU Lesser General Public |
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License along with this software; if not, write to the Free |
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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02111-1307 USA. */ |
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#ifndef _LINUX_MQUEUE_H |
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#define _LINUX_MQUEUE_H |
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#include <linux/types.h> |
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#define MQ_PRIO_MAX 32768 |
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/* per-uid limit of kernel memory used by mqueue, in bytes */ |
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#define MQ_BYTES_MAX 819200 |
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struct mq_attr { |
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__kernel_long_t mq_flags; /* message queue flags */ |
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__kernel_long_t mq_maxmsg; /* maximum number of messages */ |
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__kernel_long_t mq_msgsize; /* maximum message size */ |
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__kernel_long_t mq_curmsgs; /* number of messages currently queued */ |
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__kernel_long_t __reserved[4]; /* ignored for input, zeroed for output */ |
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}; |
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/* |
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* SIGEV_THREAD implementation: |
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* SIGEV_THREAD must be implemented in user space. If SIGEV_THREAD is passed |
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* to mq_notify, then |
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* - sigev_signo must be the file descriptor of an AF_NETLINK socket. It's not |
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* necessary that the socket is bound. |
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* - sigev_value.sival_ptr must point to a cookie that is NOTIFY_COOKIE_LEN |
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* bytes long. |
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* If the notification is triggered, then the cookie is sent to the netlink |
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* socket. The last byte of the cookie is replaced with the NOTIFY_?? codes: |
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* NOTIFY_WOKENUP if the notification got triggered, NOTIFY_REMOVED if it was |
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* removed, either due to a close() on the message queue fd or due to a |
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* mq_notify() that removed the notification. |
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*/ |
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#define NOTIFY_NONE 0 |
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#define NOTIFY_WOKENUP 1 |
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#define NOTIFY_REMOVED 2 |
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#define NOTIFY_COOKIE_LEN 32 |
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#endif
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