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How do I determine whether a filehandle is open?
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Subject Author Date
How do I determine whether a filehandle is open? Frank Seitz 04-11-2008
Posted by Frank Seitz on April 11, 2008, 3:10 pm
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 I didn't find it in the FAQ.
How do I determine whether a filehandle
(STDERR in my case) is open?

Frank
--
Dipl.-Inform. Frank Seitz; http://www.fseitz.de/
Anwendungen für Ihr Internet und Intranet
Tel: 04103/180301; Fax: -02; Industriestr. 31, 22880 Wedel

Posted by nolo contendere on April 11, 2008, 3:23 pm
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> I didn't find it in the FAQ.
> How do I determine whether a filehandle
> (STDERR in my case) is open?

if ( defined fileno STDERR ) {
print STDERR "SOME DATA";
}
else {
warn "Error: STDERR is closed!\n";
}


Posted by Frank Seitz on April 11, 2008, 3:32 pm
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nolo contendere wrote:
>
>>I didn't find it in the FAQ.
>>How do I determine whether a filehandle
>>(STDERR in my case) is open?
>
> if ( defined fileno STDERR ) {
> print STDERR "SOME DATA";
> }
> else {
> warn "Error: STDERR is closed!\n";
> }

Simon, Joost: Thank you!

Frank
--
Dipl.-Inform. Frank Seitz; http://www.fseitz.de/
Anwendungen für Ihr Internet und Intranet
Tel: 04103/180301; Fax: -02; Industriestr. 31, 22880 Wedel

Posted by Joost Diepenmaat on April 11, 2008, 3:23 pm
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> I didn't find it in the FAQ.
> How do I determine whether a filehandle
> (STDERR in my case) is open?

see perldoc -f fileno

--
Joost Diepenmaat | blog: http://joost.zeekat.nl/ | work: http://zeekat.nl/

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