man7.org > Linux > man-pages

Linux/UNIX system programming training

sys_ipc.h(0p) — Linux manual page

PROLOG | NAME | SYNOPSIS | DESCRIPTION | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT 

sys_ipc.h(0P)           POSIX Programmer's Manual          sys_ipc.h(0P)

PROLOG         top

       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         top

       sys/ipc.h — XSI interprocess communication access structure

SYNOPSIS         top

       #include <sys/ipc.h>

DESCRIPTION         top

       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.

       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         top

       None.

RATIONALE         top

       None.

FUTURE DIRECTIONS         top

       None.

SEE ALSO         top

       sys_types.h(0p)

       The System Interfaces volume of POSIX.1‐2017, ftok(3p)

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic
       form from IEEE Std 1003.1-2017, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The
       Open Group Base Specifications Issue 7, 2018 Edition, Copyright
       (C) 2018 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 .

       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
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group               2017                     sys_ipc.h(0P)

Pages that refer to this page: sys_msg.h(0p),  sys_sem.h(0p),  sys_shm.h(0p),  ftok(3p),  semop(3p)

HTML rendering created 2023-12-22 by Michael Kerrisk, author of The Linux Programming Interface.

For details of in-depth Linux/UNIX system programming training courses that I teach, look here.

Hosting by jambit GmbH.

Cover of TLPI