/* Copyright (C) 1995-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _SYS_MSG_H
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#define _SYS_MSG_H
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#include <features.h>
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#define __need_size_t
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#include <stddef.h>
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/* Get common definition of System V style IPC. */
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#include <sys/ipc.h>
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/* Get system dependent definition of `struct msqid_ds' and more. */
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#include <bits/msq.h>
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/* Define types required by the standard. */
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#include <bits/types/time_t.h>
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#ifndef __pid_t_defined
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typedef __pid_t pid_t;
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# define __pid_t_defined
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#endif
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#ifndef __ssize_t_defined
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typedef __ssize_t ssize_t;
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# define __ssize_t_defined
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#endif
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/* The following System V style IPC functions implement a message queue
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system. The definition is found in XPG2. */
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#ifdef __USE_GNU
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/* Template for struct to be used as argument for `msgsnd' and `msgrcv'. */
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struct msgbuf
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{
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__syscall_slong_t mtype; /* type of received/sent message */
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char mtext[1]; /* text of the message */
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};
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#endif
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__BEGIN_DECLS
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/* Message queue control operation. */
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extern int msgctl (int __msqid, int __cmd, struct msqid_ds *__buf) __THROW;
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/* Get messages queue. */
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extern int msgget (key_t __key, int __msgflg) __THROW;
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/* Receive message from message queue.
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This function is a cancellation point and therefore not marked with
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__THROW. */
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extern ssize_t msgrcv (int __msqid, void *__msgp, size_t __msgsz,
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long int __msgtyp, int __msgflg);
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/* Send message to message queue.
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This function is a cancellation point and therefore not marked with
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__THROW. */
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extern int msgsnd (int __msqid, const void *__msgp, size_t __msgsz,
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int __msgflg);
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__END_DECLS
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#endif /* sys/msg.h */
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