Ctrl-Z on an SSH session

Question

When I ssh into another system and press Ctrl-Z, I expected the ssh client to go into background. However, it's the remote process that does that. Where does the magic happen?

Answer 1

The SSH client disables special key handling (stty -icanon -isig options) for the local tty, so when you press CtrlZ, the client just reads the raw byte 0x1A and forwards it to the server.

OpenSSH supports a special command to suspend the client – Enter, then ~, followed by CtrlZ.