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

   1 /* Copyright (C) 2011 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library.  If not, see
  17    <http://www.gnu.org/licenses/>.  */
  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/wordsize.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 long int msgqnum_t;
  34 typedef unsigned long int msglen_t;
  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   __time_t msg_stime;           /* time of last msgsnd command */
  42 #if __WORDSIZE == 32
  43   unsigned long int __unused1;
  44 #endif
  45   __time_t msg_rtime;           /* time of last msgrcv command */
  46 #if __WORDSIZE == 32
  47   unsigned long int __unused2;
  48 #endif
  49   __time_t msg_ctime;           /* time of last change */
  50 #if __WORDSIZE == 32
  51   unsigned long int __unused3;
  52 #endif
  53   unsigned long int __msg_cbytes; /* current number of bytes on queue */
  54   msgqnum_t msg_qnum;           /* number of messages currently on queue */
  55   msglen_t msg_qbytes;          /* max number of bytes allowed on queue */
  56   __pid_t msg_lspid;            /* pid of last msgsnd() */
  57   __pid_t msg_lrpid;            /* pid of last msgrcv() */
  58   unsigned long int __unused4;
  59   unsigned long int __unused5;
  60 };
  61
  62 #ifdef __USE_MISC
  63
  64 # define msg_cbytes     __msg_cbytes
  65
  66 /* ipcs ctl commands */
  67 # define MSG_STAT 11
  68 # define MSG_INFO 12
  69
  70 /* buffer for msgctl calls IPC_INFO, MSG_INFO */
  71 struct msginfo
  72   {
  73     int msgpool;
  74     int msgmap;
  75     int msgmax;
  76     int msgmnb;
  77     int msgmni;
  78     int msgssz;
  79     int msgtql;
  80     unsigned short int msgseg;
  81   };
  82
  83 #endif /* __USE_MISC */