Section: User Contributed Perl Documentation (3)
IPC::SysV - System V IPC constants and system calls
use IPC::SysV qw(IPC_STAT IPC_PRIVATE);
defines and conditionally exports all the constants
defined in your system include files which are needed by the SysV
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.
IPC::Msg, IPC::Semaphore, IPC::SharedMem, ftok
Graham Barr <email@example.com
Jarkko Hietaniemi <firstname.lastname@example.org
Marcus Holland-Moritz <email@example.com
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.