Open pipe to a function?

[Sprad]

I've written a simple Perl implementation of tee. I'd like to use it in a larger script to log STDERR to a file. Is it possible to put my tee code inside the main script as a function and pipe to it, or do I have to have it in a separate file?

[Roy Johnson]

Have you looked at IO::Tee?

[hardburn]

I'd like to use it in a larger script to log STDERR to a file.

You don't need a seperate program for doing that. You can just reopen STDERR to wherever you like:

open(STDERR, '>', '/path/to/logfile') 
    or die "Can't open STDERR to /path/to/logfile: $!\n";

[tcf22]

If you are going to pipe it to a script, then I believe it has to be in another script.

If all you need to do is write STDERR to a file, why not just do this at the beginning of your script:

open(STDERR, '>error.txt');

Update:Try using IO::Tee, like suggested by Roy Johnson. I included a sample in my reply to you below.

[Sprad]

I can't just redirect it, because I also want to see it at runtime.

[hardburn]

You could probably do some tricks with IO::Multiplex. Just save the orginal filehandle like this:

my $old_stderr = *STDERR;

And then reopen STDERR with IO::Multiplex with $old_stderr and a filehandle to the log file.

[tcf22]

How about

use IO::Tee;
open(ERRLOG, '>error.txt');
my $tee = new IO::Tee(\*STDOUT, \*ERRLOG);
*STDERR = $tee;