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Linux 2.6 - man page for sys_ipc.h (linux section 7posix)

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

NAME
       sys/ipc.h - XSI interprocess communication access structure

SYNOPSIS
       #include <sys/ipc.h>

DESCRIPTION
       The  <sys/ipc.h>  header  is  used  by three mechanisms for XSI interprocess communication
       (IPC): messages, semaphores, and shared memory. All use a common structure type, ipc_perm,
       to pass information used in determining permission to perform an IPC operation.

       The ipc_perm structure shall contain the following members:

	      uid_t    uid    Owner's user ID.
	      gid_t    gid    Owner's group ID.
	      uid_t    cuid   Creator's user ID.
	      gid_t    cgid   Creator's group ID.
	      mode_t   mode   Read/write permission.

       The uid_t, gid_t, mode_t, and key_t types shall be defined as described in <sys/types.h> .

       Definitions shall be provided for the following constants:

       Mode bits:

       IPC_CREAT
	      Create entry if key does not exist.

       IPC_EXCL
	      Fail if key exists.

       IPC_NOWAIT
	      Error if request must wait.

       Keys:

       IPC_PRIVATE
	      Private key.

       Control commands:

       IPC_RMID
	      Remove identifier.

       IPC_SET
	      Set options.

       IPC_STAT
	      Get options.

       The  following shall be declared as a function and may also be defined as a macro. A func-
       tion prototype shall be provided.

	      key_t  ftok(const char *, int);

       The following sections are informative.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       <sys/types.h> , the System Interfaces volume of IEEE Std 1003.1-2001, ftok()

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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

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


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