while ($bytes_read) {
    my $buf;
    $bytes_read = sysread($out, $buf, $blocksize);
    ...

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Your code leaves the loop as soon as there is nothing to read on a socket.

while( <$fh> ) will read things until it encounters a newline.

In reply to Re: use sysread to read non-blocking filehandle by Corion
in thread use sysread to read non-blocking filehandle by x12345

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