C/C++ App for serial port communication

I need a C/C++ app to receive/forward commands to serial port (rs232) in 9 data bit mode. The project was tested in node.js and works fine by switching parity mark/space for the 9th data bit (works with windows only). There are two main problems with node.js serial port communication that we want to solve in C. 1. high CPU load 2. missing parity mark/space on linux 3. closing the port in middle of data transmission to switch parity. The data structure is: for the first byte start bit - 8 data bits - wake bit (1) - stop bit for the remaining part of the message/data start bit - 8 data bits - clear wake bit (0) - stop bit I need the C app to receive/forward all data to/from node.js. To function like proxy for the serial port communication. It has to be compiled on raspberry pi. Teamviewer access to connected device will be provided. sample code: private void generalpoll() { Byte[] GenPoll = { 0x80, 0x81 }; [login to view URL] = [login to view URL]; [login to view URL](GenPoll, 0, 1); // sends 0x80 gen pol to all machines they wake up and listen for their address OR'ed with 0x80 [login to view URL](20); gives the machine time to clear responses from its buffer (prevents duplicate responses) [login to view URL](GenPoll, 1, 1); // sends out poll to mahne with address of 1 [login to view URL] = [login to view URL]; } private void sendcommand (Byte[] commandbyte) // no delay needed if sending specific bytes to machine as a command, long poll, etc. { [login to view URL] = [login to view URL]; [login to view URL](commandbyte, 0, 1); [login to view URL] = [login to view URL]; [login to view URL](commandbyte, 1, commandbyte.Length-1) }