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<sys/msg.h>(P)			    POSIX Programmer's Manual			   <sys/msg.h>(P)

       sys/msg.h - XSI message queue structures

       #include <sys/msg.h>

       The <sys/msg.h> header shall define the following data types through typedef:

	      Used for the number of messages in the message queue.

	      Used for the number of bytes allowed in a message queue.

       These  types  shall  be	unsigned  integer types that are able to store values at least as
       large as a type unsigned short.

       The <sys/msg.h> header shall define the following constant as a message operation flag:

	      No error if big message.

       The msqid_ds structure shall contain the following members:

	      struct ipc_perm msg_perm	 Operation permission structure.
	      msgqnum_t       msg_qnum	 Number of messages currently on queue.
	      msglen_t	      msg_qbytes Maximum number of bytes allowed on queue.
	      pid_t	      msg_lspid  Process ID of last msgsnd
	      pid_t	      msg_lrpid  Process ID of last msgrcv
	      time_t	      msg_stime  Time of last msgsnd
	      time_t	      msg_rtime  Time of last msgrcv
	      time_t	      msg_ctime  Time of last change.

       The pid_t, time_t, key_t, size_t, and ssize_t types  shall  be  defined	as  described  in
       <sys/types.h> .

       The  following  shall be declared as functions and may also be defined as macros. Function
       prototypes shall be provided.

	      int	msgctl(int, int, struct msqid_ds *);
	      int	msgget(key_t, int);
	      ssize_t	msgrcv(int, void *, size_t, long, int);
	      int	msgsnd(int, const void *, size_t, int);

       In addition, all of the symbols from <sys/ipc.h> shall be  defined  when  this  header  is

       The following sections are informative.




       <sys/ipc.h> , <sys/types.h> , msgctl(), msgget(), msgrcv(), msgsnd()

       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information Technology  --  Portable	Operating  System
       Interface  (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
       the Institute of Electrical and Electronics Engineers, Inc and  The  Open  Group.  In  the
       event  of  any  discrepancy  between this version and the original IEEE and The Open Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				   <sys/msg.h>(P)
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