Jason Molenda bb136f5b39 Improve error messaging when debugserver fails to complete attaching ...

When debugserver is attaching to a process, it first task_for_pid()'s
and then ptrace(PT_ATTACHEXC)'s.  When that ptrace() fails to complete,
we are in a semi-attached state that we need to give up from, and
our error reporting isn't ideal -- we can even claim that the process
is already being debugged (by ourselves).

Differential Revision: https://reviews.llvm.org/D155037
rdar://101152233

2023-07-12 15:01:39 -07:00

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