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glibc  2.9
msq.h
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00001 /* Copyright (C) 1995, 1996, 1997, 2000, 2002 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #ifndef _SYS_MSG_H
00020 # error "Never use <bits/msq.h> directly; include <sys/msg.h> instead."
00021 #endif
00022 
00023 #include <bits/types.h>
00024 #include <bits/ipctypes.h>
00025 
00026 /* Define options for message queue functions.  */
00027 #define MSG_NOERROR  010000 /* no error if message is too big */
00028 #ifdef __USE_GNU
00029 # define MSG_EXCEPT  020000 /* recv any msg except of specified type */
00030 #endif
00031 
00032 /* Types used in the structure definition.  */
00033 typedef unsigned short int msgqnum_t;
00034 typedef unsigned short int msglen_t;
00035 
00036 
00037 /* Structure of record for one message inside the kernel.
00038    The type `struct msg' is opaque.  */
00039 struct msqid_ds
00040 {
00041   struct ipc_perm msg_perm; /* structure describing operation permission */
00042   struct msg *__unbounded __msg_first; /* pointer to first message on queue */
00043   struct msg *__unbounded __msg_last; /* pointer to last message on queue */
00044   __time_t msg_stime;              /* time of last msgsnd command */
00045   __time_t msg_rtime;              /* time of last msgrcv command */
00046   __time_t msg_ctime;              /* time of last change */
00047   struct wait_queue *__unbounded __wwait; /* ??? */
00048   struct wait_queue *__unbounded __rwait; /* ??? */
00049   unsigned short int __msg_cbytes;/* current number of bytes on queue */
00050   msgqnum_t msg_qnum;              /* number of messages currently on queue */
00051   msglen_t msg_qbytes;             /* max number of bytes allowed on queue */
00052   __ipc_pid_t msg_lspid;    /* pid of last msgsnd() */
00053   __ipc_pid_t msg_lrpid;    /* pid of last msgrcv() */
00054 };
00055 
00056 #ifdef __USE_MISC
00057 
00058 # define msg_cbytes  __msg_cbytes
00059 
00060 /* ipcs ctl commands */
00061 # define MSG_STAT 11
00062 # define MSG_INFO 12
00063 
00064 /* buffer for msgctl calls IPC_INFO, MSG_INFO */
00065 struct msginfo
00066   {
00067     int msgpool;
00068     int msgmap;
00069     int msgmax;
00070     int msgmnb;
00071     int msgmni;
00072     int msgssz;
00073     int msgtql;
00074     unsigned short int msgseg;
00075   };
00076 
00077 #endif /* __USE_MISC */