[FFmpeg-devel] [PATCH] Make av_get_random_seed not block when waiting for more entropy

[Martin Storsjö]

On Tue, 29 Jun 2010, M?ns Rullg?rd wrote:

> Martin Storsj? <martin at martin.st> writes:
> 
> > On Tue, 29 Jun 2010, M?ns Rullg?rd wrote:
> >
> >> This will still block if urandom isn't available.  How about this?
> >
> >> From cb60e983c550c2bdffc5fc07075336fb7c465fe9 Mon Sep 17 00:00:00 2001
> >> From: Mans Rullgard <mans at mansr.com>
> >> Date: Tue, 29 Jun 2010 14:22:51 +0100
> >> Subject: [PATCH] Make av_get_random_seed() non-blocking
> >> 
> >> Attempt to read from /dev/urandom and /dev/random with O_NONBLOCK set.
> >> If neither succeeds, proceed with fallbacks.
> >
> > In general, this looks like an even better alternative. Neither fcntl, 
> > F_SETFL, F_GETFL nor O_NONBLOCK are available on windows, though, so they 
> > need to be hidden within some kind of ifdef.
> 
> Cygwin should have them, mingw might not.
> 
> Do /dev/[u]random exist on cygwin/mingw?

Don't know about cygwin, but mingw won't have them at least, since it's 
almost plain win32.

// Martin