/* Copyright (C) 2004-2018 Free Software Foundation, Inc.

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This file is part of the GNU C Library.

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The GNU C Library 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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The GNU C Library 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 the GNU C Library; if not, see

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<http://www.gnu.org/licenses/>. */

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#ifndef _MQUEUE_H

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#define _MQUEUE_H 1

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#include <features.h>

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#include <sys/types.h>

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#include <fcntl.h>

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#include <bits/types/sigevent_t.h>

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#include <bits/types/struct_timespec.h>

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/* Get the definition of mqd_t and struct mq_attr. */

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#include <bits/mqueue.h>

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__BEGIN_DECLS

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/* Establish connection between a process and a message queue NAME and

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return message queue descriptor or (mqd_t) -1 on error. OFLAG determines

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the type of access used. If O_CREAT is on OFLAG, the third argument is

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taken as a `mode_t', the mode of the created message queue, and the fourth

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argument is taken as `struct mq_attr *', pointer to message queue

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attributes. If the fourth argument is NULL, default attributes are

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used. */

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extern mqd_t mq_open (const char *__name, int __oflag, ...)

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__THROW __nonnull ((1));

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/* Removes the association between message queue descriptor MQDES and its

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message queue. */

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extern int mq_close (mqd_t __mqdes) __THROW;

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/* Query status and attributes of message queue MQDES. */

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extern int mq_getattr (mqd_t __mqdes, struct mq_attr *__mqstat)

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__THROW __nonnull ((2));

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/* Set attributes associated with message queue MQDES and if OMQSTAT is

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not NULL also query its old attributes. */

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extern int mq_setattr (mqd_t __mqdes,

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const struct mq_attr *__restrict __mqstat,

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struct mq_attr *__restrict __omqstat)

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__THROW __nonnull ((2));

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/* Remove message queue named NAME. */

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extern int mq_unlink (const char *__name) __THROW __nonnull ((1));

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/* Register notification issued upon message arrival to an empty

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message queue MQDES. */

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extern int mq_notify (mqd_t __mqdes, const struct sigevent *__notification)

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__THROW;

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/* Receive the oldest from highest priority messages in message queue

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MQDES. */

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extern ssize_t mq_receive (mqd_t __mqdes, char *__msg_ptr, size_t __msg_len,

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unsigned int *__msg_prio) __nonnull ((2));

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/* Add message pointed by MSG_PTR to message queue MQDES. */

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extern int mq_send (mqd_t __mqdes, const char *__msg_ptr, size_t __msg_len,

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unsigned int __msg_prio) __nonnull ((2));

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#ifdef __USE_XOPEN2K

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/* Receive the oldest from highest priority messages in message queue

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MQDES, stop waiting if ABS_TIMEOUT expires. */

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extern ssize_t mq_timedreceive (mqd_t __mqdes, char *__restrict __msg_ptr,

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size_t __msg_len,

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unsigned int *__restrict __msg_prio,

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const struct timespec *__restrict __abs_timeout)

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__nonnull ((2, 5));

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/* Add message pointed by MSG_PTR to message queue MQDES, stop blocking

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on full message queue if ABS_TIMEOUT expires. */

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extern int mq_timedsend (mqd_t __mqdes, const char *__msg_ptr,

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size_t __msg_len, unsigned int __msg_prio,

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const struct timespec *__abs_timeout)

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__nonnull ((2, 5));

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#endif

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/* Define some inlines helping to catch common problems. */

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#if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function \

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&& defined __va_arg_pack_len

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# include <bits/mqueue2.h>

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#endif

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__END_DECLS

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#endif /* mqueue.h */

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