sysvipc/sys/msg.h

   1 /* Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #ifndef _SYS_MSG_H
  20 #define _SYS_MSG_H
  21
  22 #include <features.h>
  23 #include <sys/types.h>
  24
  25 /* Get common definition of System V style IPC.  */
  26 #include <sys/ipc.h>
  27
  28 /* Get system dependent definition of `struct msqid_ds' and more.  */
  29 #include <bits/msq.h>
  30
  31 /* The following System V style IPC functions implement a message queue
  32    system.  The definition is found in XPG2.  */
  33
  34 /* Template for struct to be used as argument for `msgsnd' and `msgrcv'.  */
  35 struct msgbuf
  36   {
  37     long int mtype;             /* type of received/sent message */
  38     char mtext[1];              /* text of the message */
  39   };
  40
  41
  42 __BEGIN_DECLS
  43
  44 /* Message queue control operation.  */
  45 extern int msgctl __P ((int __msqid, int __cmd, struct msqid_ds *__buf));
  46
  47 /* Get messages queue.  */
  48 extern int msgget __P ((key_t __key, int __msgflg));
  49
  50 /* Receive message from message queue.  */
  51 extern int msgrcv __P ((int __msqid, void *__msgp, size_t __msgsz,
  52                         long int __msgtyp, int __msgflg));
  53
  54 /* Send message to message queue.  */
  55 extern int msgsnd __P ((int __msqid, void *__msgp, size_t __msgsz,
  56                         int __msgflg));
  57
  58 __END_DECLS
  59
  60 #endif /* sys/msg.h */