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

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

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

NNAAMMEE #

 IPC::SysV - System V IPC constants and system calls

SSYYNNOOPPSSIISS #

   use IPC::SysV qw(IPC_STAT IPC_PRIVATE);

DDEESSCCRRIIPPTTIIOONN #

 "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 ffttookk(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 sshhmmaatt(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 sshhmmddtt(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. mmeemmrreeaadd(()) 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.

SSEEEE AALLSSOO #

 IPC::Msg, IPC::Semaphore, IPC::SharedMem, ffttookk(3), sshhmmaatt(2), sshhmmddtt(2)

AAUUTTHHOORRSS #

 Graham Barr <gbarr@pobox.com>, Jarkko Hietaniemi <jhi@iki.fi>, Marcus
 Holland-Moritz <mhx@cpan.org>

CCOOPPYYRRIIGGHHTT #

 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 v5.36.3 2023-02-15 IPC::SysV(3p)