bug#11825: 24.1.50; float-time no longer accepts negative time values

[Eli Zaretskii]

> Date: Sat, 07 Jul 2012 13:30:04 -0700
> From: Paul Eggert <eggert@cs.ucla.edu>
> CC: 11825@debbugs.gnu.org
> 
> On 07/06/2012 11:57 PM, Eli Zaretskii wrote:
> > Yes, the type used by DJGPP for time_t is unsigned.
> 
> OK, thanks, but in that case I don't see how
> the use of EMACS_TIME_SIGN in src/msdos.c can
> be correct.  On hosts where time_t is unsigned,
> EMACS_TIME_SIGN can never be negative.

I'm not sure I understand: are you saying that a time difference can
never be negative on such platforms?  What about the case tv_sec = 0
in both time values and tv_nsec difference is negative?

In any case, this is a different problem.  There's nothing wrong with
sys_select on msdos.c, it seems to work just fine.