[FFmpeg-cvslog] Move av_tempfile() into libavutil, it is a generically usefull thing and its small.

[Reimar Döffinger]

On Sun, Oct 16, 2011 at 05:21:22PM +0200, Michael Niedermayer wrote:
> -    fd = open(*filename, O_RDWR | O_BINARY | O_CREAT, 0444);

Adding O_EXCL should increase security here.
Seems supported at least on Linux and Windows.
Might fail compilation on some systems though.