pub fn tcflow(fd: RawFd, action: c_int) -> Result<()>
Suspends or restarts transmission or reception of data.
fdshould be an open file descriptor associated with a terminal.
actionshould be one of the following constants:
TCIOFFtransmits a STOP character, intended to cause the remote device to stop transmitting.
TCIONtransmits a START character, intended to cause the remote device to resume transmitting.