The 4 spaces look much better.

But the comments you proposed don't add anything of value. "open the directory handle ..." is as easy or difficult to understand as "opendir(...) or ...". Even more obvious with the closedir line, the comment is just redundant noise.

Comments should add information not repeat it IMHO. A good place for comments is at the start of a subroutine, to exactly specify what parameters are expected and what is returned. Or at really complicated lines to sum up what is done there

In reply to Re^3: Bad file descriptor error by jethro
in thread Bad file descriptor error by Lamont85

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