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/* Copyright (C) 2004-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library 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.
The GNU C Library 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 the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef _MQUEUE_H
#define _MQUEUE_H 1
#include <features.h>
#include <sys/types.h>
#include <fcntl.h>
#include <bits/types/sigevent_t.h>
#include <bits/types/struct_timespec.h>
/* Get the definition of mqd_t and struct mq_attr. */
#include <bits/mqueue.h>
__BEGIN_DECLS
/* Establish connection between a process and a message queue NAME and
return message queue descriptor or (mqd_t) -1 on error. OFLAG determines
the type of access used. If O_CREAT is on OFLAG, the third argument is
taken as a `mode_t', the mode of the created message queue, and the fourth
argument is taken as `struct mq_attr *', pointer to message queue
attributes. If the fourth argument is NULL, default attributes are
used. */
extern mqd_t mq_open (const char *__name, int __oflag, ...)
__THROW __nonnull ((1));
/* Removes the association between message queue descriptor MQDES and its
message queue. */
extern int mq_close (mqd_t __mqdes) __THROW;
/* Query status and attributes of message queue MQDES. */
extern int mq_getattr (mqd_t __mqdes, struct mq_attr *__mqstat)
__THROW __nonnull ((2));
/* Set attributes associated with message queue MQDES and if OMQSTAT is
not NULL also query its old attributes. */
extern int mq_setattr (mqd_t __mqdes,
const struct mq_attr *__restrict __mqstat,
struct mq_attr *__restrict __omqstat)
__THROW __nonnull ((2));
/* Remove message queue named NAME. */
extern int mq_unlink (const char *__name) __THROW __nonnull ((1));
/* Register notification issued upon message arrival to an empty
message queue MQDES. */
extern int mq_notify (mqd_t __mqdes, const struct sigevent *__notification)
__THROW;
/* Receive the oldest from highest priority messages in message queue
MQDES. */
extern ssize_t mq_receive (mqd_t __mqdes, char *__msg_ptr, size_t __msg_len,
unsigned int *__msg_prio) __nonnull ((2));
/* Add message pointed by MSG_PTR to message queue MQDES. */
extern int mq_send (mqd_t __mqdes, const char *__msg_ptr, size_t __msg_len,
unsigned int __msg_prio) __nonnull ((2));
#ifdef __USE_XOPEN2K
# ifndef __USE_TIME_BITS64
/* Receive the oldest from highest priority messages in message queue
MQDES, stop waiting if ABS_TIMEOUT expires. */
extern ssize_t mq_timedreceive (mqd_t __mqdes, char *__restrict __msg_ptr,
size_t __msg_len,
unsigned int *__restrict __msg_prio,
const struct timespec *__restrict __abs_timeout)
__nonnull ((2, 5));
/* Add message pointed by MSG_PTR to message queue MQDES, stop blocking
on full message queue if ABS_TIMEOUT expires. */
extern int mq_timedsend (mqd_t __mqdes, const char *__msg_ptr,
size_t __msg_len, unsigned int __msg_prio,
const struct timespec *__abs_timeout)
__nonnull ((2, 5));
# else
# ifdef __REDIRECT
extern int __REDIRECT (mq_timedreceive, (mqd_t __mqdes,
char *__restrict __msg_ptr,
size_t __msg_len,
unsigned int *__restrict __msg_prio,
const struct timespec *__restrict __abs_timeout),
__mq_timedreceive_time64)
__nonnull ((2, 5));
extern int __REDIRECT (mq_timedsend, (mqd_t __mqdes,
const char *__msg_ptr, size_t __msg_len,
unsigned int __msg_prio,
const struct timespec *__abs_timeout),
__mq_timedsend_time64)
__nonnull ((2, 5));
# else
# define mq_timedreceive __mq_timedreceive_time64
# define mq_timedsend __mq_timedsend_time64
# endif
# endif
#endif
/* Define some inlines helping to catch common problems. */
#if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function \
&& defined __va_arg_pack_len
# include <bits/mqueue2.h>
#endif
__END_DECLS
#endif /* mqueue.h */