On Tue, Jul 29, 2008 at 11:59:35PM -0700, Rahul Iyer wrote: > I have a full duplex voice application, that records voice and sends > (over a network) as well as receives and plays voice. OSS APIs are used > to capture and play voice samples. > > The voice quality is noticeably poor in SUSE 10. After further > investigation, I see most of the 'read' system calls fail with EAGAIN > (resource unavailable) error. This is not the case in SUSE 9.2. if the device is opened in non-blocking mode, EAGAIN means that there are not enough samples to read and thus the read(2) system call would block, so it returns EAGAIN instead of blocking the program execution. It's not a failure. It's the normal behaviour when the device is opened with O_NONBLOCK flag. Its purpose is to allow interactive (ie not CPU bound) apps to work using (for instance) an event loop into a single execution thread. Nevertheless, i don't know why there's a difference between different versions of your operating system. It seems that either your program doesn't handle EAGAIN or that the device returns EAGAIN were it shouldn't. -- Alexandre ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
