sysdeps/unix/sysv/linux/bits/msq.h

   1 /* Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    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    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #ifndef _SYS_MSQ_BUF_H
  21
  22 #define _SYS_MSQ_BUF_H  1
  23 #include <features.h>
  24
  25 #include <sys/types.h>
  26
  27 /* Define options for message queue functions.  */
  28 #define MSG_NOERROR     010000  /* no error if message is too big */
  29 #define MSG_EXCEPT      020000  /* recv any msg except of specified type */
  30
  31
  32 __BEGIN_DECLS
  33
  34 /* Structure of record for one message inside the kernel.
  35    The type `struct __msg' is opaque.  */
  36 struct msqid_ds
  37 {
  38   struct ipc_perm msg_perm;     /* structure describing operation permission */
  39   struct msg *__msg_first;      /* pointer to first message on queue */
  40   struct msg *__msg_last;       /* pointer to last message on queue */
  41   __time_t msg_stime;           /* time of last msgsnd command */
  42   __time_t msg_rtime;           /* time of last msgrcv command */
  43   __time_t msg_ctime;           /* time of last change */
  44   struct wait_queue *__wwait;   /* ??? */
  45   struct wait_queue *__rwait;   /* ??? */
  46   unsigned short int __msg_cbytes;/* current number of bytes on queue */
  47   unsigned short int msg_qnum;  /* number of messages currently on queue */
  48   unsigned short int msg_qbytes;/* max number of bytes allowed on queue */
  49   int msg_lspid;                /* pid of last msgsnd() */
  50   int msg_lrpid;                /* pid of last msgrcv() */
  51 };
  52
  53 #ifdef __USE_MISC
  54
  55 #define msg_cbytes      __msg_cbytes
  56
  57 /* ipcs ctl commands */
  58 #define MSG_STAT 11
  59 #define MSG_INFO 12
  60
  61 /* buffer for msgctl calls IPC_INFO, MSG_INFO */
  62 struct msginfo
  63 {
  64   int msgpool;
  65   int msgmap;
  66   int msgmax;
  67   int msgmnb;
  68   int msgmni;
  69   int msgssz;
  70   int msgtql;
  71   ushort  msgseg;
  72 };
  73
  74 #endif /* __USE_MISC */
  75
  76 __END_DECLS
  77
  78 #endif /* bits/msq_buf.h */