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mqueue.h
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mqueue.h
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// Copyright (c) 2015 Nuxi, https://nuxi.nl/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
// <mqueue.h> - message queues
//
// Extensions:
// - mq_destroy() and mq_init():
// Allows for the creation of anonymous process-local message queues.
//
// Features missing:
// - struct sigevent and mq_notify():
// Requires signal handling support.
// - mq_close(), mq_open() and mq_unlink():
// Requires global IPC namespace. Omitting mq_open() also means that
// mqd_t does not need to be an arithmetic type.
#ifndef _MQUEUE_H_
#define _MQUEUE_H_
#include <_/struct/timespec.h> // IWYU pragma: export
#include <_/types.h>
#ifndef _PTHREAD_ATTR_T_DECLARED
typedef __pthread_attr_t pthread_attr_t;
#define _PTHREAD_ATTR_T_DECLARED
#endif
#ifndef _SIZE_T_DECLARED
typedef __size_t size_t;
#define _SIZE_T_DECLARED
#endif
#ifndef _SSIZE_T_DECLARED
typedef __ssize_t ssize_t;
#define _SSIZE_T_DECLARED
#endif
typedef struct {
struct __mqd *__mqd;
} mqd_t;
struct mq_attr {
long mq_flags; // Message queue flags.
long mq_maxmsg; // Maximum number of messages.
long mq_msgsize; // Maximum message size.
long mq_curmsgs; // Number of messages currently queued.
};
__BEGIN_DECLS
int mq_destroy(mqd_t);
int mq_getattr(mqd_t, struct mq_attr *);
int mq_init(mqd_t *, const struct mq_attr *);
ssize_t mq_receive(mqd_t, char *, size_t, unsigned int *);
int mq_send(mqd_t, const char *, size_t, unsigned int);
int mq_setattr(mqd_t, const struct mq_attr *__restrict,
struct mq_attr *__restrict);
ssize_t mq_timedreceive(mqd_t, char *__restrict, size_t,
unsigned int *__restrict,
const struct timespec *__restrict);
int mq_timedsend(mqd_t, const char *, size_t, unsigned int,
const struct timespec *);
__END_DECLS
#endif