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IPC::SysV(3perl) Perl Programmers Reference Guide IPC::SysV(3perl)
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"
and "shmget". 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 AT pobox.com>, Jarkko Hietaniemi <jhi AT iki.fi>, Marcus Holland-Moritz
<mhx AT 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.
perl v5.34.0 2023-11-23 IPC::SysV(3perl)
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On Apache
Under GNU General Public License
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