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# IPC::SysV

Perl 5 version 22.0 documentation
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# IPC::SysV

- NAME
- SYNOPSIS
- DESCRIPTION
- SEE ALSO
- AUTHORS
- COPYRIGHT

# 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.

  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.

Page index

- NAME
- SYNOPSIS
- DESCRIPTION
- SEE ALSO
- AUTHORS
- COPYRIGHT