|IPC::SysV(3perl)||Perl Programmers Reference Guide||IPC::SysV(3perl)|
NAME¶IPC::SysV - System V IPC constants and system calls
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
"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 <firstname.lastname@example.org>, Jarkko Hietaniemi <email@example.com>, Marcus Holland-Moritz <firstname.lastname@example.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.