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<sys/msg.h>(0P)		   POSIX Programmer's Manual	       <sys/msg.h>(0P)

NAME
       sys/msg.h - XSI message queue structures

SYNOPSIS
       #include <sys/msg.h>

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

       msgqnum_t
	      Used for the number of messages in the message queue.

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

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

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

       MSG_NOERROR
	      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 included.

       The following sections are informative.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

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

COPYRIGHT
       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 original Standard can be  obtained	online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003		       <sys/msg.h>(0P)
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