sysdeps/unix/sysv/linux/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/msq-pad.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 # define MSG_COPY       040000  /* copy (not remove) all queue messages */
  30 #endif
  31
  32 /* Types used in the structure definition.  */
  33 typedef __syscall_ulong_t msgqnum_t;
  34 typedef __syscall_ulong_t msglen_t;
  35
  36 #if __MSQ_PAD_BEFORE_TIME
  37 # define __MSQ_PAD_TIME(NAME, RES)                              \
  38   unsigned long int __glibc_reserved ## RES; __time_t NAME
  39 #elif __MSQ_PAD_AFTER_TIME
  40 # define __MSQ_PAD_TIME(NAME, RES)                              \
  41   __time_t NAME; unsigned long int __glibc_reserved ## RES
  42 #else
  43 # define __MSQ_PAD_TIME(NAME, RES)              \
  44   __time_t NAME
  45 #endif
  46
  47 /* Structure of record for one message inside the kernel.
  48    The type `struct msg' is opaque.  */
  49 struct msqid_ds
  50 {
  51   struct ipc_perm msg_perm;     /* structure describing operation permission */
  52   __MSQ_PAD_TIME (msg_stime, 1);        /* time of last msgsnd command */
  53   __MSQ_PAD_TIME (msg_rtime, 2);        /* time of last msgrcv command */
  54   __MSQ_PAD_TIME (msg_ctime, 3);        /* time of last change */
  55   __syscall_ulong_t __msg_cbytes; /* current number of bytes on queue */
  56   msgqnum_t msg_qnum;           /* number of messages currently on queue */
  57   msglen_t msg_qbytes;          /* max number of bytes allowed on queue */
  58   __pid_t msg_lspid;            /* pid of last msgsnd() */
  59   __pid_t msg_lrpid;            /* pid of last msgrcv() */
  60   __syscall_ulong_t __glibc_reserved4;
  61   __syscall_ulong_t __glibc_reserved5;
  62 };
  63
  64 #ifdef __USE_MISC
  65
  66 # define msg_cbytes     __msg_cbytes
  67
  68 /* ipcs ctl commands */
  69 # define MSG_STAT 11
  70 # define MSG_INFO 12
  71 # define MSG_STAT_ANY 13
  72
  73 /* buffer for msgctl calls IPC_INFO, MSG_INFO */
  74 struct msginfo
  75   {
  76     int msgpool;
  77     int msgmap;
  78     int msgmax;
  79     int msgmnb;
  80     int msgmni;
  81     int msgssz;
  82     int msgtql;
  83     unsigned short int msgseg;
  84   };
  85
  86 #endif /* __USE_MISC */