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IPC::SharedMem(3perl) Perl Programmers Reference Guide IPC::SharedMem(3perl)
NAME
IPC::SharedMem - SysV Shared Memory IPC object class
SYNOPSIS
use IPC::SysV qw(IPC_PRIVATE S_IRUSR S_IWUSR);
use IPC::SharedMem;
$shm = IPC::SharedMem->new(IPC_PRIVATE, 8, S_IRWXU);
$shm->write(pack("S", 4711), 2, 2);
$data = $shm->read(0, 2);
$ds = $shm->stat;
$shm->remove;
DESCRIPTION
A class providing an object based interface to SysV IPC shared memory.
METHODS
new ( KEY , SIZE , FLAGS )
Creates a new shared memory segment of "SIZE" bytes size associated with "KEY". A new
segment is created if
o "KEY" is equal to "IPC_PRIVATE"
o "KEY" does not already have a shared memory segment associated with it, and "FLAGS
& IPC_CREAT" is true.
On creation of a new shared memory segment "FLAGS" is used to set the permissions. Be
careful not to set any flags that the Sys V IPC implementation does not allow: in some
systems setting execute bits makes the operations fail.
id Returns the shared memory identifier.
read ( POS, SIZE )
Read "SIZE" bytes from the shared memory segment at "POS". Returns the string read, or
"undef" if there was an error. The return value becomes tainted. See shmread.
write ( STRING, POS, SIZE )
Write "SIZE" bytes to the shared memory segment at "POS". Returns true if successful,
or false if there is an error. See shmwrite.
remove
Remove the shared memory segment from the system or mark it as removed as long as any
processes are still attached to it.
is_removed
Returns true if the shared memory segment has been removed or marked for removal.
stat
Returns an object of type "IPC::SharedMem::stat" which is a sub-class of
"Class::Struct". It provides the following fields. For a description of these fields
see you system documentation.
uid
gid
cuid
cgid
mode
segsz
lpid
cpid
nattch
atime
dtime
ctime
attach ( [FLAG] )
Permanently attach to the shared memory segment. When a "IPC::SharedMem" object is
attached, it will use memread and memwrite instead of shmread and shmwrite for
accessing the shared memory segment. Returns true if successful, or false on error.
See shmat(2).
detach
Detach from the shared memory segment that previously has been attached to. Returns
true if successful, or false on error. See shmdt(2).
addr
Returns the address of the shared memory that has been attached to in a format
suitable for use with "pack('P')". Returns "undef" if the shared memory has not been
attached.
SEE ALSO
IPC::SysV, Class::Struct
AUTHORS
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::SharedMem(3perl)
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On Apache
Under GNU General Public License
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