sysvipc/sys/msg.h

   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 */