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, see 16 <http://www.gnu.org/licenses/>. */ 17 18 #ifndef _MQUEUE_H 19 #define _MQUEUE_H 1 20 21 #include <features.h> 22 #if defined __UCLIBC_HAS_REALTIME__ || \ 23 defined __UCLIBC_HAS_ADVANCED_REALTIME__ 24 #include <sys/types.h> 25 #include <fcntl.h> 26 #define __need_sigevent_t 27 #include <bits/siginfo.h> 28 #define __need_timespec 29 #include <time.h> 30 /* Get the definition of mqd_t and struct mq_attr. */ 31 #include <bits/mqueue.h> 32 #endif 33 34 __BEGIN_DECLS 35 #if defined __UCLIBC_HAS_REALTIME__ 36 /* Establish connection between a process and a message queue NAME and 37 return message queue descriptor or (mqd_t) -1 on error. OFLAG determines 38 the type of access used. If O_CREAT is on OFLAG, the third argument is 39 taken as a `mode_t', the mode of the created message queue, and the fourth 40 argument is taken as `struct mq_attr *', pointer to message queue 41 attributes. If the fourth argument is NULL, default attributes are 42 used. */ 43 extern mqd_t mq_open (const char *__name, int __oflag, ...) __THROW; 44 45 /* Removes the association between message queue descriptor MQDES and its 46 message queue. */ 47 extern int mq_close (mqd_t __mqdes) __THROW; 48 49 /* Query status and attributes of message queue MQDES. */ 50 extern int mq_getattr (mqd_t __mqdes, struct mq_attr *__mqstat) __THROW; 51 52 /* Set attributes associated with message queue MQDES and if OMQSTAT is 53 not NULL also query its old attributes. */ 54 extern int mq_setattr (mqd_t __mqdes, 55 const struct mq_attr *__restrict __mqstat, 56 struct mq_attr *__restrict __omqstat) __THROW; 57 58 /* Remove message queue named NAME. */ 59 extern int mq_unlink (const char *__name) __THROW; 60 61 /* Register notification issued upon message arrival to an empty 62 message queue MQDES. */ 63 extern int mq_notify (mqd_t __mqdes, const struct sigevent *__notification) 64 __THROW; 65 66 /* Receive the oldest from highest priority messages in message queue 67 MQDES. */ 68 extern ssize_t mq_receive (mqd_t __mqdes, char *__msg_ptr, size_t __msg_len, 69 unsigned int *__msg_prio); 70 71 /* Add message pointed by MSG_PTR to message queue MQDES. */ 72 extern int mq_send (mqd_t __mqdes, const char *__msg_ptr, size_t __msg_len, 73 unsigned int __msg_prio); 74 #endif 75 76 #if defined __USE_XOPEN2K && defined __UCLIBC_HAS_ADVANCED_REALTIME__ 77 /* Receive the oldest from highest priority messages in message queue 78 MQDES, stop waiting if ABS_TIMEOUT expires. */ 79 extern ssize_t mq_timedreceive (mqd_t __mqdes, char *__restrict __msg_ptr, 80 size_t __msg_len, 81 unsigned int *__restrict __msg_prio, 82 const struct timespec *__restrict __abs_timeout); 83 84 /* Add message pointed by MSG_PTR to message queue MQDES, stop blocking 85 on full message queue if ABS_TIMEOUT expires. */ 86 extern int mq_timedsend (mqd_t __mqdes, const char *__msg_ptr, 87 size_t __msg_len, unsigned int __msg_prio, 88 const struct timespec *__abs_timeout); 89 #endif 90 91 __END_DECLS 92 93 #endif /* mqueue.h */ 94