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