sys_ipc.h
Section: POSIX Programmer's Manual (0P)
Updated: 2017
Page Index
PROLOG
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
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
<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
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
<sys_types.h>
The System Interfaces volume of POSIX.1-2017,
ftok()
COPYRIGHT
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 .