1IO::Pipe(3pm)          Perl Programmers Reference Guide          IO::Pipe(3pm)
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NAME

6       IO::Pipe - supply object methods for pipes
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SYNOPSIS

9               use IO::Pipe;
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11               $pipe = IO::Pipe->new();
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13               if($pid = fork()) { # Parent
14                   $pipe->reader();
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16                   while(<$pipe>) {
17                       ...
18                   }
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20               }
21               elsif(defined $pid) { # Child
22                   $pipe->writer();
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24                   print $pipe ...
25               }
26
27               or
28
29               $pipe = IO::Pipe->new();
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31               $pipe->reader(qw(ls -l));
32
33               while(<$pipe>) {
34                   ...
35               }
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DESCRIPTION

38       "IO::Pipe" provides an interface to creating pipes between processes.
39

CONSTRUCTOR

41       new ( [READER, WRITER] )
42           Creates an "IO::Pipe", which is a reference to a newly created
43           symbol (see the "Symbol" package). "IO::Pipe::new" optionally takes
44           two arguments, which should be objects blessed into "IO::Handle",
45           or a subclass thereof. These two objects will be used for the
46           system call to "pipe". If no arguments are given then method
47           "handles" is called on the new "IO::Pipe" object.
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49           These two handles are held in the array part of the GLOB until
50           either "reader" or "writer" is called.
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METHODS

53       reader ([ARGS])
54           The object is re-blessed into a sub-class of "IO::Handle", and
55           becomes a handle at the reading end of the pipe. If "ARGS" are
56           given then "fork" is called and "ARGS" are passed to exec.
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58       writer ([ARGS])
59           The object is re-blessed into a sub-class of "IO::Handle", and
60           becomes a handle at the writing end of the pipe. If "ARGS" are
61           given then "fork" is called and "ARGS" are passed to exec.
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63       handles ()
64           This method is called during construction by "IO::Pipe::new" on the
65           newly created "IO::Pipe" object. It returns an array of two objects
66           blessed into "IO::Pipe::End", or a subclass thereof.
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SEE ALSO

69       IO::Handle
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AUTHOR

72       Graham Barr. Currently maintained by the Perl Porters.  Please report
73       all bugs to <perlbug@perl.org>.
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76       Copyright (c) 1996-8 Graham Barr <gbarr@pobox.com>. All rights
77       reserved.  This program is free software; you can redistribute it
78       and/or modify it under the same terms as Perl itself.
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82perl v5.34.0                      2021-10-18                     IO::Pipe(3pm)
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