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Portable IPC::Open3 timeout

by fglock (Vicar)
on Mar 03, 2005 at 00:47 UTC ( #436051=snippet: print w/replies, xml ) Need Help??

Here is a way to timeout Open3 processes without using signals or OS-specific modules.

Tested with Perl 5.8.0 under Windows NT, Perl 5.8.5 under Cygwin, and Perl 5.8.4 under Linux.

    use IPC::Open3;
    use strict;

    my $timeout = 5;
    my ( $wtr, $rdr, $err );

    my $test_program;
    if ( $^O =~ /win32/i )
        $test_program = q{" $|=1; for( 0 .. 10 ) { print \"$_\n\"; sle
+ep 1; } "};
        $test_program = q{ $|=1; for( 0 .. 10 ) { print "$_\n"; sleep 
+1; } };

    my $pid = open3($wtr, $rdr, $err, 'perl', '-e', $test_program );

    my $forked = fork();
    die "fork() failed: $!" unless defined $forked;
    if ( $forked == 0 )
        sleep $timeout;
        kill(9, $pid);

    while ( <$rdr> )
        print $_;
        sleep 1;
    print "finished\n";

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Node Type: snippet [id://436051]
[Corion]: A good daypart!
Corion feels slightly bad for initiating a discussion yesterday and then running away. I guess I should write that up as a meditation or SoPW
[Corion]: Not the "running away" part but the question+ discussion about IO-less HTTP modules
[Corion]: (or how/where to patch AnyEvent::HTTP or LWP::UserAgent to take control of both the callstack and the data transfer)

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