sys/ipc.h(1) 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.

COPYRIGHT

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 .

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