Maybe you could just try this:
my @x;
if ( opendir(my $DIR, $somedir) ) {
@x = readdir($DIR) or die "$!";
closedir($DIR);
}
At least, it would give you a diagnostic if the readdir instruction fails.
Also using the strict and warnings pragmas might help if you don't (and you should do it).
A possible alternative would be to use the glob function, which is often more practical than the opendir/readdir combination. Perhaps something like this:
my @x = glob "$somedir/*.*" if -d $somedir;
would do the trick.
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