[lldb-dev] Debugging a running process with lldb
mg11 at csr.com
Thu May 15 22:01:52 PDT 2014
Greg Clayton wrote:
> So to clear things up:
> -t or --tty will attempt to launch the process in a _separate_terminal_window_ (open a new terminal window and launch your process within it so the process gets its own window and we don't have to shared IO) and should never be used with -n (--no-stdio). If they currently can be run together then this is a bug. --tty isn't supported on Linux as far as I know and the linux launch code should return an error saying this isn't supported. The --tty option is designed to be used when you want to debug anything that uses curses (emacs, vi, etc) and where having a different terminal window with its own stdin/out/err is required.
> --no-stdio should, as you surmised, launch a process with /dev/null as the stdin/out/err. It also means we should always have a prompt.
> To to summarize:
> (lldb) process launch ...
> No LLDB prompt while running as all input goes to process (though if CTRL+C is pressed and we will stop the target for you)
> (lldb) process launch --tty -- ...
> LLDB prompt always visible, process launches in a different terminal window, not supported on linux, should never be used with --no-stdio and if our options allow it, this is a bug
> (lldb) process launch --no-stdio -- ...
> LLDB prompt always visible (if not, then a bug, probably only on the linux side).
Thanks for confirming this.
I might have a look at fixing the linux bug in a few weeks if the rest
of my work permits.
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