my $line = <$fh>;

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This will block. You should not mix non-blocking and blocking I/O when trying to stay non-blocking.

select will only tell you if there is at least one byte readable on a handle. It doesn't tell you how many bytes are actually available on the handle wihtout blocking.

In reply to Re: First SELECT of FIFO still blocked ? by Corion
in thread First SELECT of FIFO still blocked ? by Anonymous Monk

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