This'll give you a list of filehandle objects open for read on the current file descriptors that are also open: 
use FileHandle;
my @handles = map FileHandle->new_from_fd($_, "r"), 0..100;

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Handles that aren't open come back as undef in this array. So $handles[0] is STDIN, etc.

If you don't need the mapping from specific fd, then add grep defined($_), in front of the map.

-- Randal L. Schwartz, Perl hacker
Be sure to read my standard disclaimer if this is a reply.

In reply to •Re: open file descriptors by merlyn
in thread open file descriptors by jeremyh

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