


IPC::SysV(3p)    Perl Programmers Reference Guide   IPC::SysV(3p)


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_CREATE 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.





perl v5.10.1                2009-10-12                          1





IPC::SysV(3p)    Perl Programmers Reference Guide   IPC::SysV(3p)


       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, 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 v5.10.1                2009-10-12                          2


