I'd think the ^C would be transmitted by a physical disconnect, i.e. changing the state of the DCD line. The DCD disconnect should immediately trigger an inter

I'd think the ^C would be transmitted by a physical disconnect, i.e. changing the state of the DCD line. The DCD disconnect should immediately trigger an interrupt, which should trigger a SIGHUP. To be fair, though, I can't say I've used a proper serial terminal.