sysdeps/unix/sysv/linux/sys/msq_buf.h

   1 /* Copyright (C) 1995 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
  17 not, 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 #define _SYS_MSQ_BUF_H
  22
  23 #include <features.h>
  24 #include <sys/types.h>
  25
  26 /* Define options for message queue functions.  */
  27 #define MSG_NOERROR     010000  /* no error if message is too big */
  28 #define MSG_EXCEPT      020000  /* recv any msg except of specified type */
  29
  30
  31 __BEGIN_DECLS
  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   struct msg *__msg_first;      /* pointer to first message on queue */
  39   struct msg *__msg_last;       /* pointer to last message on queue */
  40   __time_t msg_stime;           /* time of last msgsnd command */
  41   __time_t msg_rtime;           /* time of last msgrcv command */
  42   __time_t msg_ctime;           /* time of last change */
  43   struct wait_queue *__wwait;   /* ??? */
  44   struct wait_queue *__rwait;   /* ??? */
  45   unsigned short int __msg_cbytes;/* current number of bytes on queue */
  46   unsigned short int msg_qnum;  /* number of messages currently on queue */
  47   unsigned short int msg_qbytes;/* max number of bytes allowed on queue */
  48   __pid_t msg_lspid;            /* pid of last msgsnd() */
  49   __pid_t msg_lrpid;            /* pid of last msgrcv() */
  50 };
  51
  52 #ifdef __USE_MISC
  53
  54 #define msg_cbytes      __msg_cbytes
  55
  56 /* ipcs ctl commands */
  57 #define MSG_STAT 11
  58 #define MSG_INFO 12
  59
  60 /* buffer for msgctl calls IPC_INFO, MSG_INFO */
  61 struct msginfo {
  62     int msgpool;
  63     int msgmap;
  64     int msgmax;
  65     int msgmnb;
  66     int msgmni;
  67     int msgssz;
  68     int msgtql;
  69     ushort  msgseg;
  70 };
  71
  72 #endif /* __USE_MISC */
  73
  74 __END_DECLS
  75
  76 #endif /* sys/msq_buf.h */