>From sndio design, it looks like non-blocking (like in sio_write) can be done >with poll. sio_pollfd can be used to obtain the pollfd struct which contains the file descriptor fd. The fd descriptor seems to be equivalent to the unix stream for the sound playing device.
Would it be possible to use the file descriptor fd with kqueue instead of poll? (I wanted to adapt an application that uses kqueue for internet/TCP server listening, and be able to add an audio playing capability; I wanted to try to use kqueue for both. I also wanted to learn more about using kqueue) I wrote a basic program that gets the sndio playing device file descriptor fd from sio_pollfd, and then adds that fd to the kevent with filter EVFILT_WRITE. Then loop with kevent appears to return that the fd is ready for WRITE, and the kevent return data shows '4096' (available space in buffer for write) but sio_write returns with value 0, indicating that no bytes could be written into the output buffer. Is there something different about the file descriptor for the sndio output device, that kqueue/kevent can't be used? thanks.
