Re: select() timeout

[Matthias Scheler <tron%zhadum.org.uk@localhost>]

On Mon, Feb 27, 2012 at 11:49:56AM -0500, Thor Lancelot Simon wrote:
> > I've see select(2) blanking a huge portion of stack space under Linux
> > because OpenSSL got a file descriptor number outside of FD_SETSIZE.
> > The author of this bit of code had just like you assumed that nothing
> > could go wrong when you use select(2) to handle a single file descriptor.
> > 
> > Newer version of OpenSSL use poll(2).
> 
> Where does OpenSSL use either?

When it wants to seed its own random number generator from "/dev/random"
or "/dev/urandom". It is e.g. used to make sure that RAND_pseudo_bytes()
always returns instead of waiting for entropy provided by the kernel.

        Kind regards

-- 
Matthias Scheler                                  http://zhadum.org.uk/