msg.h
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上传日期:2009-04-28
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- /* Copyright (C) 1995,1996,1997,1999,2000,2003 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, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
- #ifndef _SYS_MSG_H
- #define _SYS_MSG_H
- #include <features.h>
- /* Get common definition of System V style IPC. */
- #include <sys/ipc.h>
- /* Get system dependent definition of `struct msqid_ds' and more. */
- #include <bits/msq.h>
- /* Define types required by the standard. */
- #define __need_time_t
- #include <time.h>
- #ifndef __pid_t_defined
- typedef __pid_t pid_t;
- # define __pid_t_defined
- #endif
- #ifndef __ssize_t_defined
- typedef __ssize_t ssize_t;
- # define __ssize_t_defined
- #endif
- /* The following System V style IPC functions implement a message queue
- system. The definition is found in XPG2. */
- #ifdef __USE_GNU
- /* Template for struct to be used as argument for `msgsnd' and `msgrcv'. */
- struct msgbuf
- {
- long int mtype; /* type of received/sent message */
- char mtext[1]; /* text of the message */
- };
- #endif
- __BEGIN_DECLS
- /* Message queue control operation. */
- extern int msgctl (int __msqid, int __cmd, struct msqid_ds *__buf) __THROW;
- /* Get messages queue. */
- extern int msgget (key_t __key, int __msgflg) __THROW;
- /* Receive message from message queue.
- This function is a cancellation point and therefore not marked with
- __THROW. */
- extern int msgrcv (int __msqid, void *__msgp, size_t __msgsz,
- long int __msgtyp, int __msgflg);
- /* Send message to message queue.
- This function is a cancellation point and therefore not marked with
- __THROW. */
- extern int msgsnd (int __msqid, __const void *__msgp, size_t __msgsz,
- int __msgflg);
- __END_DECLS
- #endif /* sys/msg.h */