readpassphrase(3) buffer needs explicit_bzero(3) on error?

Hi,

I'd like to clarify if it's necessary to clear the buffer in the case
that the function failed. Most errors seem to be clearly triggered
before the first byte is written to the buffer: EINVAL, EIO, EMFILE,
ENFILE, ENOTTY.

But there is one, EINTR, which is not clear if there was any data
written or not. I think this should be clarified, for such a sensitive
function.

Also, adding explicit_bzero(3) to SEE ALSO might be desirable.

Cheers,

Alex

--
<http://www.alejandro-colomar.es/>