Hey Franz, At 07:48 AM 5/22/03 +0200, Franz Reinhardt wrote: >After requesting buffer should I only mmap a single buffer per mmap() - >call ? >Or is it possible to map multiple buffers with one mmap ()- call ? That's how it used to work in v4l1. In v4l2, you map each buffer separately. Some drivers will probably not care which of the two you use, for others (v4l2-only drivers), only single-buffer mapping might work. So to be safe, use a per-buffer mapping in your app. >What if mmap () is called again for the same buffer ? >From the same session (file descriptor), it will work, afaik. You'll need to munmap() twice, too. From another session, it will fail and errno will be set to EBUSY. Ronald
