Hello! I want to use a raspberry pi's serial to communicate over a protocol that uses 9-bit characters, so currently I'm using the stick parity mode (CMSPAR) and toggling between odd and even parity, then using tcsetattr with TCSADRAIN as the second argument, which blocks until all bytes are transmitted. Is there a non-blocking api to do the same thing, so I can use it from poll / select? (If there's a better way to do 9 bit character size, that'd be even better. For my protocol, the 9th bit is only used to tell address bytes from data bytes, so I don't have to change it often, so I guess my current method isn't too horrible.) Thanks!
