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Currently when you interrupt a:
(lldb) process attach -w -n some_process
lldb just closes the connection to the stub and kills the
lldb_private::Process it made for the attach. The stub at the other end
notices the connection go down and exits because of that. But when
communication to a device is handled through some kind of proxy server
which isn't as well behaved as one would wish, that signal might not be
reliable, causing debugserver to persist on the machine, waiting to
steal the next instance of that process.
We can work around those failures by sending an explicit interrupt
before closing down the connection. The stub will also have to be
waiting for the interrupt for this to make any difference. I changed
debugserver to do that.
I didn't make the equivalent change in lldb-server. So long as you
aren't faced with a flakey connection, this should not be necessary.
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