[lldb-dev] [Bug 25002] New: test runner timeout does not work properly when inferior itself spawns children and shares file handles

[via lldb-dev]

https://llvm.org/bugs/show_bug.cgi?id=25002

            Bug ID: 25002
           Summary: test runner timeout does not work properly when
                    inferior itself spawns children and shares file
                    handles
           Product: lldb
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: lldb-dev at lists.llvm.org
          Reporter: todd.fiala at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Discovered during:
https://llvm.org/bugs/show_bug.cgi?id=24993

I'll need to not trust the inferior's stdout/stderr pipe liveness to mean that
the child process is still alive. It could be dead, with its own children
keeping the pipes open.  I've got a positive test case of this not working
right:
* spawn child (P1)
* have child spawn another child (C1), sharing stdout/stderr/stdin.
* C1 never returns (loops forever)
* P1 immediately exits

At this point, the test runner should recognize that the process it launched
(P1) has completed.   Currently it does not.  Worse yet, in my test, it never
exits the run_with_timeout() call (i.e. the timeout isn't occurring.)

Fixing this now.

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