trusty (7) sys_ipc.h.7posix.gz

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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()


       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 .