I take back my comment about write-blocking ("I don't see a check to see how much can be written without blocking"). I forgot to factor in that non-blocking applies to writing too.

So you don't have a problem with syswrite, but you do have a problem with sysread. If the sysread would block, it'll return undef, and your program will exit prematurely.

On Linux, setting the sockets and pipes to non-blocking doesn't seem to be required at all, but I am not sure it other Unixes will perform the same.

Nonsense. Imagine if the remote end does 

print while <>;

[download]

If you try reading from the socket, your program will become permanently blocked.

In reply to Re^3: golf challenge: one-liner netcat clone by ikegami
in thread golf challenge: one-liner netcat clone by salva

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