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

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

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>(P)
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