1  /* Copyright (C) 1995-2023 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     <https://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  
      24  /* Define options for message queue functions.  */
      25  #define MSG_NOERROR	010000	/* no error if message is too big */
      26  
      27  /* Types used in the structure definition.  */
      28  typedef unsigned short int msgqnum_t;
      29  typedef unsigned short int msglen_t;
      30  
      31  
      32  /* Structure of record for one message inside the kernel.
      33     The type `struct __msg' is opaque.  */
      34  struct msqid_ds
      35  {
      36    struct ipc_perm msg_perm;	/* structure describing operation permission */
      37    __time_t msg_stime;		/* time of last msgsnd command */
      38    __time_t msg_rtime;		/* time of last msgrcv command */
      39    __time_t msg_ctime;		/* time of last change */
      40    msgqnum_t msg_qnum;		/* number of messages currently on queue */
      41    msglen_t msg_qbytes;		/* max number of bytes allowed on queue */
      42    __pid_t msg_lspid;		/* pid of last msgsnd() */
      43    __pid_t msg_lrpid;		/* pid of last msgrcv() */
      44  };