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/* SPDX-License-Identifier: LGPL-2.1+ WITH Linux-syscall-note */

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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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* 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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#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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