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That is indeed the correct solution (to use sysread). However, it's worse than simply because there's no newline.

select generally doesn't work properly if you mix in buffered reads and writes; select will perpetually think something is readable, or nothing is readable, because the buffering has over-read or under-read on the handle.

This means that whenever you're using select, either directly or indirectly through IO::Select or some event loop, then you must use sysread and syswrite (not print, <$fh>, read(), etc.).

You often end up doing your own buffering with sysread and syswrite, because often you're still dealing with line-oriented protocols. This is fairly boilerplate stuff, and it's recommended to use an event loop that does most of it for you (e.g. POE, Event, IO::Async, etc.).


In reply to Re^2: IO::Select - reading multiple lines by Somni
in thread IO::Select - reading multiple lines by nagalenoj

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    [ambrus]: was this bug: https://rt.cpan. org/Public/Bug/ Display.html?id= 59814
    [Corion]: ambrus: Oh - that one would be much harder to automate... The SYNOPSIS section should mostly be a runnable program IMO, but I write only small snippets in my documentation for single functions/methods, and creating the appropriate environment for ...
    [Corion]: ... those in an automated fashion seems somewhat hard to me. Although it should do wonders for the test coverage ;)
    [haukex]: Corion: I once wrote an automated thingy for that here
    [haukex]: here's the code that uses it
    [Corion]: haukex: Hmm - maybe I can reuse that. I see that it uses Pod::Parser, which I think was one of the more fragile parsers. But if I'm statically (re)generating the tests instead of doing that "live" on the client/tester machines, that's a much smaller...
    [Corion]: ... problem space than trying to cater to all versions of Pod::Parser(s)

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