On Fri, 21 Jul 2023, 03:31 Wiley Young, <wyeth2...@gmail.com> wrote: > The first time I saw this bug, tty3 crashed and isn't available any more > in /dev/pts . Partially reproducing the bug, ttys have crashed but they > become available for use again when I press Ctrl-Shift-t from > xfce4-terminal. >
Point of order, this is NOT a crash. It's important to understand that the terminal emulator and the Shell are separate processes that know very little about each other. > A ptx/pty pair is what connects them, as a pair of pseudo serial devices in the kernel. If that crashed your whole machine would panic and reboot. A terminal emulator will normally close its ptx connection automatically when there are no processes still connected to the corresponding pty. In Linux this triggers the kernel to destroy the pty entirely. Some terminal emulators can be configured not to close immediately, but it's not the default. You also mentioned /dev/tty3, which is the Linux VT (console) #3. It doesn't do anything when its connected process goes away, BUT the system init process will notice when your Shell terminates, and run a new login process, and THAT will often send a request to clear the screen. But of course, I forgot the second single quote! Press [Ctrl-d]. > Without the quote, the Shell is still waiting for the closing quote; it never actually runs git. So when you press ctrl-D to signal end of input, that's sent to the shell. This has the same meaning as reaching the end of an actual file (containing a script): there is nothing more for the Shell to do, so it exits. For an interactive Shell this can be prevented by setting IGNOREEOF=5 (e.g. in ~/.bashrc), however there's a known issue that this can be unreliable when the Shell is looking for a quote mark or other closing token, meaning that it may still exit immediately despite that setting. (The number assigned to IGNOREEOF indicates how many times you have to type ctrl-D to cause the Shell to exit. Numbers in the range 3-15 can be useful) -Martin
