On 11/03/2014 07:37 PM, Steve M. Robbins wrote: > On Mon, Nov 03, 2014 at 05:29:53PM +0100, Philippe Gerum wrote: > >> Just to make sure we are on the same page, as Dietmar mentioned in an >> earlier mail, read() as implemented by the rt-pipe driver only returns >> _one_ message at a time, although > 1 could be pending. One has to >> iterate over a read() loop using a non-blocking fd on the /dev/rtp >> device to get them all. > > Aha! Thanks (and to Dietmar). I completely missed this fact. I'll > go re-write the read as a loop and see if it works better. I should read > until the read() returns 0 (bytes read)? >
Until you get -1 with errno == EWOULDBLOCK. Zero would rather mean that the other end of pipe has been disconnected, just like with a regular FIFO. -- Philippe. _______________________________________________ Xenomai mailing list [email protected] http://www.xenomai.org/mailman/listinfo/xenomai
