sys_ipc.h(3)               POSIX Programmer's Manual              sys_ipc.h(3)



PPRROOLLOOGG
       This manual page is part of the POSIX Programmer's Manual.  The OS
       implementation of this interface may differ (consult the corresponding
       OS manual page for details of OS behavior), or the interface may not be
       implemented on OS.

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

SSYYNNOOPPSSIISS
       #include <sys/ipc.h>

DDEESSCCRRIIPPTTIIOONN
       The _<_s_y_s_/_i_p_c_._h_> header is used by three mechanisms for XSI interprocess
       communication (IPC): messages, semaphores, and shared memory. All use a
       common structure type, iippcc__ppeerrmm, to pass information used in
       determining permission to perform an IPC operation.

       The _<_s_y_s_/_i_p_c_._h_> header shall define the iippcc__ppeerrmm 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 _<_s_y_s_/_i_p_c_._h_> header shall define the uuiidd__tt, ggiidd__tt, mmooddee__tt, and kkeeyy__tt
       types as described in _<_s_y_s_/_t_y_p_e_s_._h_>.

       The _<_s_y_s_/_i_p_c_._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);

       _T_h_e _f_o_l_l_o_w_i_n_g _s_e_c_t_i_o_n_s _a_r_e _i_n_f_o_r_m_a_t_i_v_e_.

AAPPPPLLIICCAATTIIOONN UUSSAAGGEE
       None.

RRAATTIIOONNAALLEE
       None.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       <<ssyyss__ttyyppeess..hh>>

       The System Interfaces volume of POSIX.1-2017, _f_t_o_k()

CCOOPPYYRRIIGGHHTT
       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(3)
