1IPC::SysV(3)          User Contributed Perl Documentation         IPC::SysV(3)
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NAME

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

9         use IPC::SysV qw(IPC_STAT IPC_PRIVATE);
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DESCRIPTION

12       "IPC::SysV" defines and conditionally exports all the constants defined
13       in your system include files which are needed by the SysV IPC calls.
14       Common ones include
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16         IPC_CREAT IPC_EXCL IPC_NOWAIT IPC_PRIVATE IPC_RMID IPC_SET IPC_STAT
17         GETVAL SETVAL GETPID GETNCNT GETZCNT GETALL SETALL
18         SEM_A SEM_R SEM_UNDO
19         SHM_RDONLY SHM_RND SHMLBA
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21       and auxiliary ones
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23         S_IRUSR S_IWUSR S_IRWXU
24         S_IRGRP S_IWGRP S_IRWXG
25         S_IROTH S_IWOTH S_IRWXO
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27       but your system might have more.
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29       ftok( PATH )
30       ftok( PATH, ID )
31           Return a key based on PATH and ID, which can be used as a key for
32           "msgget", "semget" and "shmget". See ftok(3).
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34           If ID is omitted, it defaults to 1. If a single character is given
35           for ID, the numeric value of that character is used.
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37       shmat( ID, ADDR, FLAG )
38           Attach the shared memory segment identified by ID to the address
39           space of the calling process. See shmat(2).
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41           ADDR should be "undef" unless you really know what you're doing.
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43       shmdt( ADDR )
44           Detach the shared memory segment located at the address specified
45           by ADDR from the address space of the calling process. See
46           shmdt(2).
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48       memread( ADDR, VAR, POS, SIZE )
49           Reads SIZE bytes from a memory segment at ADDR starting at position
50           POS.  VAR must be a variable that will hold the data read. Returns
51           true if successful, or false if there is an error. memread() taints
52           the variable.
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54       memwrite( ADDR, STRING, POS, SIZE )
55           Writes SIZE bytes from STRING to a memory segment at ADDR starting
56           at position POS. If STRING is too long, only SIZE bytes are used;
57           if STRING is too short, nulls are written to fill out SIZE bytes.
58           Returns true if successful, or false if there is an error.
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SEE ALSO

61       IPC::Msg, IPC::Semaphore, IPC::SharedMem, ftok(3), shmat(2), shmdt(2)
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AUTHORS

64       Graham Barr <gbarr@pobox.com>, Jarkko Hietaniemi <jhi@iki.fi>, Marcus
65       Holland-Moritz <mhx@cpan.org>
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68       Version 2.x, Copyright (C) 2007-2013, Marcus Holland-Moritz.
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70       Version 1.x, Copyright (c) 1997, Graham Barr.
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72       This program is free software; you can redistribute it and/or modify it
73       under the same terms as Perl itself.
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77perl v5.30.1                      2020-02-05                      IPC::SysV(3)
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