Manual Reference Pages  - <sys/ipc.h> (P)

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.

CONTENTS

Name
Synopsis
Description
Application Usage
Rationale
Future Directions
See Also
Copyright

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 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.

SEE ALSO

<sys/types.h> , the System Interfaces volume of IEEE Std 1003.1-2001, ftok()

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 .


IEEE/The Open Group <sys/ipc.h> (P) 2003
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