1/* Copyright (C) 2004, 2005 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, write to the Free 16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 17 02111-1307 USA. */ 18 19#ifndef _MQUEUE_H 20#define _MQUEUE_H 1 21 22#include <features.h> 23#if defined __UCLIBC_HAS_REALTIME__ || \ 24 defined __UCLIBC_HAS_ADVANCED_REALTIME__ 25#include <sys/types.h> 26#include <fcntl.h> 27#define __need_sigevent_t 28#include <bits/siginfo.h> 29#define __need_timespec 30#include <time.h> 31/* Get the definition of mqd_t and struct mq_attr. */ 32#include <bits/mqueue.h> 33#endif 34 35__BEGIN_DECLS 36#if defined __UCLIBC_HAS_REALTIME__ 37/* Establish connection between a process and a message queue NAME and 38 return message queue descriptor or (mqd_t) -1 on error. OFLAG determines 39 the type of access used. If O_CREAT is on OFLAG, the third argument is 40 taken as a `mode_t', the mode of the created message queue, and the fourth 41 argument is taken as `struct mq_attr *', pointer to message queue 42 attributes. If the fourth argument is NULL, default attributes are 43 used. */ 44extern mqd_t mq_open (const char *__name, int __oflag, ...) __THROW; 45 46/* Removes the association between message queue descriptor MQDES and its 47 message queue. */ 48extern int mq_close (mqd_t __mqdes) __THROW; 49 50/* Query status and attributes of message queue MQDES. */ 51extern int mq_getattr (mqd_t __mqdes, struct mq_attr *__mqstat) __THROW; 52 53/* Set attributes associated with message queue MQDES and if OMQSTAT is 54 not NULL also query its old attributes. */ 55extern int mq_setattr (mqd_t __mqdes, 56 const struct mq_attr *__restrict __mqstat, 57 struct mq_attr *__restrict __omqstat) __THROW; 58 59/* Remove message queue named NAME. */ 60extern int mq_unlink (const char *__name) __THROW; 61 62/* Register notification issued upon message arrival to an empty 63 message queue MQDES. */ 64extern int mq_notify (mqd_t __mqdes, const struct sigevent *__notification) 65 __THROW; 66 67/* Receive the oldest from highest priority messages in message queue 68 MQDES. */ 69extern ssize_t mq_receive (mqd_t __mqdes, char *__msg_ptr, size_t __msg_len, 70 unsigned int *__msg_prio); 71 72/* Add message pointed by MSG_PTR to message queue MQDES. */ 73extern int mq_send (mqd_t __mqdes, const char *__msg_ptr, size_t __msg_len, 74 unsigned int __msg_prio); 75#endif 76 77#if defined __USE_XOPEN2K && defined __UCLIBC_HAS_ADVANCED_REALTIME__ 78/* Receive the oldest from highest priority messages in message queue 79 MQDES, stop waiting if ABS_TIMEOUT expires. */ 80extern ssize_t mq_timedreceive (mqd_t __mqdes, char *__restrict __msg_ptr, 81 size_t __msg_len, 82 unsigned int *__restrict __msg_prio, 83 const struct timespec *__restrict __abs_timeout); 84 85/* Add message pointed by MSG_PTR to message queue MQDES, stop blocking 86 on full message queue if ABS_TIMEOUT expires. */ 87extern int mq_timedsend (mqd_t __mqdes, const char *__msg_ptr, 88 size_t __msg_len, unsigned int __msg_prio, 89 const struct timespec *__abs_timeout); 90#endif 91 92__END_DECLS 93 94#endif /* mqueue.h */ 95