[DynInst_API:] [dyninst/dyninst] f7e262: Fix wrong handling for PTRACE_EVENT_EXIT in procco...

[Xiaozhu Meng <xmeng@xxxxxxxxxxx>]

  Branch: refs/heads/master
  Home:   https://github.com/dyninst/dyninst
  Commit: f7e262e3788b6fcaa61f1660ad5cdfe4c1adfd00
      https://github.com/dyninst/dyninst/commit/f7e262e3788b6fcaa61f1660ad5cdfe4c1adfd00
  Author: Xiaozhu Meng <xmeng@xxxxxxxxxxx>
  Date:   2018-11-28 (Wed, 28 Nov 2018)

  Changed paths:
    M proccontrol/src/linux.C

  Log Message:
  -----------
  Fix wrong handling for PTRACE_EVENT_EXIT in proccontrol. Currently, each time we see PTRACE_EVENT_EXIT, we assume the mutatee exited normally. However, this is a wrong assumption. Based on the man page of PTRACE:

PTRACE_EVENT_EXIT will happen before actual death,  This applies to exits via
exit(2), exit_group(2), and signal deaths

PTRACE_EVENT_EXIT will also be delivered to proccontrol when the mutatee
died of crashes/signals. So, we need to check whether the waitpid status
represents a normal exit or a signal exit



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