IPC::SysV (3)

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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 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.

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.

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.

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, shmat, shmdt

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.