Re: Script execution blocked when reading from a socket
- From: anno4000@xxxxxxxxxxxxxxxxxxxxxxx (Anno Siegel)
- Date: 17 Jan 2006 16:38:45 GMT
Mark <nospam@xxxxxxxxxxxxxxxx> wrote in comp.lang.perl.misc:
> "Anno Siegel" <anno4000@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
> >>
> >> # Select() is supposed to succeed if the socket has data,
> >> # or else timeout and return FALSE.
> >> if (!(select (SOCK, undef, undef, 10.0))) {goto NEXT_IP;}
> >
> > Select guarantees that at least on character is available. You
> > are trying to read an entire line. Try reading a single character.
>
> Is this what you are suggesting?
>
> if (!recv(SOCK, $line, 1, 0)) {goto NEXT_IP;}
It is, or rather, it was before I noticed you are not using select() right.
In particular, the first argument isn't a filehandle but a bit vector of
file numbers. See perldoc -f select. The standard module IO::Select takes
care of the technicalities.
> I tried this, but my script still hangs up on the same IP
> addresses that caused problems before.
Well, so far you have been relying on random results from select().
Try the real thing.
Anno
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