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