Weizhong Dai <weizhong....@gmail.com> asked:
> ---------------------------------
> $pid = open(README, "program arguments |") or die "Couldn't fork:
> $!\n";
> while (<README>) {
> # ...
> }
> close(README)
> ----------------------------------
>
> my problem is: I read from README, but if waiting for next input is
> timeout, end reading. Is there any timer or method I could use for
> this purpose?
This code is probably better written as
my $program = ...;
my @arguments = ...;
my $pid = open( my $readme, '-|', $program, @arguments) or die "Can't fork
'$program': $!";
while( <$readme> ){
...
}
close( $readme );
(code OTTOH, please excuse any typos)
i.e.
- use lexical variables
- don't use a typeglob for your filehandle, use a lexical variable instead
- use three-argument open for increased safety
As for the timeout question, I assume what you want to do is this:
- read input from $program
- if there's no input, then stop reading after suitable timeout period
Something like that is usually done using select() as shown in the second usage
example in http://perldoc.perl.org/functions/select.html
HTH,
Thomas
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