bits/msq.h

   1 /* Copyright (C) 1995, 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 #error "Never use <bits/msq.h> directly; include <sys/msg.h> instead."
  21 #endif
  22
  23 #include <sys/types.h>
  24
  25 /* Define options for message queue functions.  */
  26 #define MSG_NOERROR     010000  /* no error if message is too big */
  27
  28
  29 /* Structure of record for one message inside the kernel.
  30    The type `struct __msg' is opaque.  */
  31 struct msqid_ds
  32 {
  33   struct ipc_perm msg_perm;     /* structure describing operation permission */
  34   __time_t msg_stime;           /* time of last msgsnd command */
  35   __time_t msg_rtime;           /* time of last msgrcv command */
  36   __time_t msg_ctime;           /* time of last change */
  37   unsigned short int msg_qnum;  /* number of messages currently on queue */
  38   unsigned short int msg_qbytes;/* max number of bytes allowed on queue */
  39   __pid_t msg_lspid;            /* pid of last msgsnd() */
  40   __pid_t msg_lrpid;            /* pid of last msgrcv() */
  41 };