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TkIO.pm
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1996-04-07
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package LWP::IO;
# $Id: TkIO.pm,v 1.4 1996/04/07 20:39:06 aas Exp $
require Tk;
require LWP::Debug;
=head1 NAME
LWP::TkIO - Tk I/O routines for the LWP library
=head1 SYNOPSIS
use Tk;
require LWP::TkIO;
require LWP::UserAgent;
=head1 DESCRIPTION
This module provide replacement functions for the LWP::IO
functions. Require this module if you use Tk and want non exclusive IO
behaviour from LWP. This does not allow LWP to run simultaneous
requests though.
See also L<LWP::IO>.
=cut
sub read
{
my $fd = shift;
my $dataRef = \$_[0];
my $size = $_[1];
my $offset = $_[2] || 0;
my $timeout = $_[3];
my $doneFlag = 0;
my $timeoutFlag = 0;
my $n;
Tk->fileevent($fd, 'readable',
sub {
$n = sysread($fd, $$dataRef, $size, $offset);
LWP::Debug::conns("Read $n bytes: '" .
substr($$dataRef, $offset, $n) .
"'") if defined $n;
$doneFlag = 1;
}
);
my $timer = Tk->after($timeout*1000, sub {$timeoutFlag = 1;} );
Tk::DoOneEvent(0) until ($doneFlag || $timeoutFlag);
Tk->after(cancel => $timer);
Tk->fileevent($fd, 'readable', ''); # no more callbacks
die "Timeout" if $timeoutFlag;
return $n;
}
sub write
{
my $fd = shift;
my $dataRef = \$_[0];
my $timeout = $_[1];
my $len = length $$dataRef;
return 0 unless $len;
my $offset = 0;
my $timeoutFlag = 0;
my $doneFlag = 0;
my $timeoutSub = sub { $timeoutFlag = 1; };
my $timer;
$timer = Tk->after($timeout*1000, $timeoutSub ) if $timeout;
Tk->fileevent($fd, 'writable',
sub {
my $n = syswrite($fd, $$dataRef, $len-$offset, $offset);
if (!defined $n) {
$done = 1;
} else {
LWP::Debug::conns("Write $n bytes: '" .
substr($$dataRef, $offset, $n) .
"'");
$offset += $n;
$timer = Tk->after($timeout*1000, $timeoutSub )
if $timeout;
}
}
);
Tk::DoOneEvent(0) until ($timeoutFlag || $doneFlag || $offset >= $len);
Tk->fileevent($fd, 'writable', ''); # no more callbacks
Tk->after(cancel => $timer) if $timeout;
die "Timeout" if $timeoutFlag;
$offset;
}
1;