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       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.


       sys/ipc.h — XSI interprocess communication access structure


       #include <sys/ipc.h>


       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  <sys/ipc.h>  header  shall  define  the  ipc_perm  structure, which shall include 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 <sys/ipc.h> header shall define the uid_t, gid_t, mode_t, and key_t types as described
       in <sys/types.h>.

       The <sys/ipc.h> header shall define the following symbolic 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.


       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.









       The System Interfaces volume of POSIX.1‐2008, ftok()


       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1,  2013  Edition,  Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013  by  the
       Institute  of  Electrical  and  Electronics  Engineers,  Inc and The Open Group.  (This is
       POSIX.1-2008 with the  2013  Technical  Corrigendum  1  applied.)  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 .

       Any  typographical  or  formatting errors that appear in this page are most likely to have
       been introduced during the conversion of the source files to man page  format.  To  report
       such errors, see .