bits/msq.h

   1 /* Copyright (C) 1995, 1997, 2000 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    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 <bits/types.h>
  24
  25 /* Define options for message queue functions.  */
  26 #define MSG_NOERROR     010000  /* no error if message is too big */
  27
  28 /* Types used in the structure definition.  */
  29 typedef unsigned short int msgqnum_t;
  30 typedef unsigned short int msglen_t;
  31
  32
  33 /* Structure of record for one message inside the kernel.
  34    The type `struct __msg' is opaque.  */
  35 struct msqid_ds
  36 {
  37   struct ipc_perm msg_perm;     /* structure describing operation permission */
  38   __time_t msg_stime;           /* time of last msgsnd command */
  39   __time_t msg_rtime;           /* time of last msgrcv command */
  40   __time_t msg_ctime;           /* time of last change */
  41   msgqnum_t msg_qnum;           /* number of messages currently on queue */
  42   msglen_t msg_qbytes;          /* max number of bytes allowed on queue */
  43   __pid_t msg_lspid;            /* pid of last msgsnd() */
  44   __pid_t msg_lrpid;            /* pid of last msgrcv() */
  45 };