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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??

Description:

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; } "};
    }
    else
    {
        $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);
        exit;
    }

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

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