CONTENTS

• NAME
• SYNOPSIS
• DESCRIPTION
• SEE ALSO
• AUTHORS
• COPYRIGHT

#NAME

IPC::SysV - System V IPC constants and system calls

#SYNOPSIS

use IPC::SysV qw(IPC_STAT IPC_PRIVATE);

#DESCRIPTION

IPC::SysV defines and conditionally exports all the constants defined in your system include files which are needed by the SysV IPC calls. Common ones include

IPC_CREATE IPC_EXCL IPC_NOWAIT IPC_PRIVATE IPC_RMID IPC_SET IPC_STAT
GETVAL SETVAL GETPID GETNCNT GETZCNT GETALL SETALL
SEM_A SEM_R SEM_UNDO
SHM_RDONLY SHM_RND SHMLBA

and auxiliary ones

S_IRUSR S_IWUSR S_IRWXU
S_IRGRP S_IWGRP S_IRWXG
S_IROTH S_IWOTH S_IRWXO

but your system might have more.

#ftok( PATH )

#ftok( PATH, ID )

Return a key based on PATH and ID, which can be used as a key for msgget, semget and shmget. See ftok.

If ID is omitted, it defaults to 1. If a single character is given for ID, the numeric value of that character is used.

#shmat( ID, ADDR, FLAG )

Attach the shared memory segment identified by ID to the address space of the calling process. See shmat.

ADDR should be undef unless you really know what you're doing.

#shmdt( ADDR )

Detach the shared memory segment located at the address specified by ADDR from the address space of the calling process. See shmdt.

#memread( ADDR, VAR, POS, SIZE )

Reads SIZE bytes from a memory segment at ADDR starting at position POS. VAR must be a variable that will hold the data read. Returns true if successful, or false if there is an error. memread() taints the variable.

#memwrite( ADDR, STRING, POS, SIZE )

Writes SIZE bytes from STRING to a memory segment at ADDR starting at position POS. If STRING is too long, only SIZE bytes are used; if STRING is too short, nulls are written to fill out SIZE bytes. Returns true if successful, or false if there is an error.

#SEE ALSO

IPC::Msg, IPC::Semaphore, IPC::SharedMem, ftok, shmat, shmdt

#AUTHORS

Graham Barr <gbarr@pobox.com>, Jarkko Hietaniemi <jhi@iki.fi>, Marcus Holland-Moritz <mhx@cpan.org>

#COPYRIGHT

Version 2.x, Copyright (C) 2007, Marcus Holland-Moritz.

Version 1.x, Copyright (c) 1997, Graham Barr.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

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