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 39 typedef __pid_t pid_t; 40 # define __pid_t_defined 41 #endif 42 43 #ifndef __ssize_t_defined 44 typedef __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'. */ 53 struct 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. */ 64 extern int msgctl (int __msqid, int __cmd, struct msqid_ds *__buf) __THROW; 65 66 /* Get messages queue. */ 67 extern 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. */ 73 extern 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. */ 80 extern int msgsnd (int __msqid, __const void *__msgp, size_t __msgsz, 81 int __msgflg); 82 83 __END_DECLS 84 85 #endif /* sys/msg.h */ 86
