sysdeps/gnu/bits/msq.h

   1 /* Copyright (C) 1995, 1996, 1997, 2000, 2002 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 #include <bits/ipctypes.h>
  25
  26 /* Define options for message queue functions.  */
  27 #define MSG_NOERROR     010000  /* no error if message is too big */
  28 #ifdef __USE_GNU
  29 # define MSG_EXCEPT     020000  /* recv any msg except of specified type */
  30 #endif
  31
  32 /* Types used in the structure definition.  */
  33 typedef unsigned short int msgqnum_t;
  34 typedef unsigned short int msglen_t;
  35
  36
  37 /* Structure of record for one message inside the kernel.
  38    The type `struct msg' is opaque.  */
  39 struct msqid_ds
  40 {
  41   struct ipc_perm msg_perm;     /* structure describing operation permission */
  42   struct msg *__unbounded __msg_first; /* pointer to first message on queue */
  43   struct msg *__unbounded __msg_last; /* pointer to last message on queue */
  44   __time_t msg_stime;           /* time of last msgsnd command */
  45   __time_t msg_rtime;           /* time of last msgrcv command */
  46   __time_t msg_ctime;           /* time of last change */
  47   struct wait_queue *__unbounded __wwait; /* ??? */
  48   struct wait_queue *__unbounded __rwait; /* ??? */
  49   unsigned short int __msg_cbytes;/* current number of bytes on queue */
  50   msgqnum_t msg_qnum;           /* number of messages currently on queue */
  51   msglen_t msg_qbytes;          /* max number of bytes allowed on queue */
  52   __ipc_pid_t msg_lspid;        /* pid of last msgsnd() */
  53   __ipc_pid_t msg_lrpid;        /* pid of last msgrcv() */
  54 };
  55
  56 #ifdef __USE_MISC
  57
  58 # define msg_cbytes     __msg_cbytes
  59
  60 /* ipcs ctl commands */
  61 # define MSG_STAT 11
  62 # define MSG_INFO 12
  63
  64 /* buffer for msgctl calls IPC_INFO, MSG_INFO */
  65 struct msginfo
  66   {
  67     int msgpool;
  68     int msgmap;
  69     int msgmax;
  70     int msgmnb;
  71     int msgmni;
  72     int msgssz;
  73     int msgtql;
  74     unsigned short int msgseg;
  75   };
  76
  77 #endif /* __USE_MISC */