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_CREAT 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
andshmget
. See ftok(3).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(2).
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(2).
- 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(3), shmat(2), shmdt(2)
AUTHORS
Graham Barr <gbarr@pobox.com>, Jarkko Hietaniemi <jhi@iki.fi>, Marcus Holland-Moritz <mhx@cpan.org>
COPYRIGHT
Version 2.x, Copyright (C) 2007-2013, 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.