sysdeps/gnu/bits/msq.h

   1 /* Copyright (C) 1995-2018 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _SYS_MSG_H
  19 # error "Never use <bits/msq.h> directly; include <sys/msg.h> instead."
  20 #endif
  21
  22 #include <bits/types.h>
  23 #include <bits/ipctypes.h>
  24
  25 /* Define options for message queue functions.  */
  26 #define MSG_NOERROR     010000  /* no error if message is too big */
  27 #ifdef __USE_GNU
  28 # define MSG_EXCEPT     020000  /* recv any msg except of specified type */
  29 #endif
  30
  31 /* Types used in the structure definition.  */
  32 typedef unsigned short int msgqnum_t;
  33 typedef unsigned short int msglen_t;
  34
  35
  36 /* Structure of record for one message inside the kernel.
  37    The type `struct msg' is opaque.  */
  38 struct msqid_ds
  39 {
  40   struct ipc_perm msg_perm;     /* structure describing operation permission */
  41   struct msg *__msg_first;      /* pointer to first message on queue */
  42   struct msg *__msg_last;       /* pointer to last message on queue */
  43   __time_t msg_stime;           /* time of last msgsnd command */
  44   __time_t msg_rtime;           /* time of last msgrcv command */
  45   __time_t msg_ctime;           /* time of last change */
  46   struct wait_queue *__wwait;   /* ??? */
  47   struct wait_queue *__rwait;   /* ??? */
  48   unsigned short int __msg_cbytes;/* current number of bytes on queue */
  49   msgqnum_t msg_qnum;           /* number of messages currently on queue */
  50   msglen_t msg_qbytes;          /* max number of bytes allowed on queue */
  51   __ipc_pid_t msg_lspid;        /* pid of last msgsnd() */
  52   __ipc_pid_t msg_lrpid;        /* pid of last msgrcv() */
  53 };
  54
  55 #ifdef __USE_MISC
  56
  57 # define msg_cbytes     __msg_cbytes
  58
  59 /* ipcs ctl commands */
  60 # define MSG_STAT 11
  61 # define MSG_INFO 12
  62
  63 /* buffer for msgctl calls IPC_INFO, MSG_INFO */
  64 struct msginfo
  65   {
  66     int msgpool;
  67     int msgmap;
  68     int msgmax;
  69     int msgmnb;
  70     int msgmni;
  71     int msgssz;
  72     int msgtql;
  73     unsigned short int msgseg;
  74   };
  75
  76 #endif /* __USE_MISC */