1/* Copyright (C) 1995-1997,1999,2000,2003,2006,2007 2 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, write to the Free 17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 18 02111-1307 USA. */ 19 20#ifndef _SYS_MSG_H 21#define _SYS_MSG_H 22 23#include <features.h> 24 25#define __need_size_t 26#include <stddef.h> 27 28/* Get common definition of System V style IPC. */ 29#include <sys/ipc.h> 30 31/* Get system dependent definition of `struct msqid_ds' and more. */ 32#include <bits/msq.h> 33 34/* Define types required by the standard. */ 35#define __need_time_t 36#include <time.h> 37 38#ifndef __pid_t_defined 39typedef __pid_t pid_t; 40# define __pid_t_defined 41#endif 42 43#ifndef __ssize_t_defined 44typedef __ssize_t ssize_t; 45# define __ssize_t_defined 46#endif 47 48/* The following System V style IPC functions implement a message queue 49 system. The definition is found in XPG2. */ 50 51#ifdef __USE_GNU 52/* Template for struct to be used as argument for `msgsnd' and `msgrcv'. */ 53struct msgbuf 54 { 55 long int mtype; /* type of received/sent message */ 56 char mtext[1]; /* text of the message */ 57 }; 58#endif 59 60 61__BEGIN_DECLS 62 63/* Message queue control operation. */ 64extern int msgctl (int __msqid, int __cmd, struct msqid_ds *__buf) __THROW; 65 66/* Get messages queue. */ 67extern int msgget (key_t __key, int __msgflg) __THROW; 68 69/* Receive message from message queue. 70 71 This function is a cancellation point and therefore not marked with 72 __THROW. */ 73extern ssize_t msgrcv (int __msqid, void *__msgp, size_t __msgsz, 74 long int __msgtyp, int __msgflg); 75 76/* Send message to message queue. 77 78 This function is a cancellation point and therefore not marked with 79 __THROW. */ 80extern int msgsnd (int __msqid, __const void *__msgp, size_t __msgsz, 81 int __msgflg); 82 83__END_DECLS 84 85#endif /* sys/msg.h */ 86