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[/] [hf-risc/] [trunk/] [tools/] [riscv-gnu-toolchain-master/] [linux-headers/] [include/] [linux/] [mqueue.h] - Blame information for rev 13

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1 13 serginhofr
/* 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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#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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