Syscall index: 0x1BB8
Function signature: int Serial_Close(int mode)
Closes the serial port, clearing all buffers and optionally aborting any active transmissions.\
- mode: Set to 1 to abort any active transmissions, anything else to fail if any transmission is pending.\
0 on success, or 5 if the port was not closed because a transmission is pending. 5 will only be returned if mode is not passed as 1.