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mqueue.h
/* 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 */
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