Improve handling of errors between fork and exec.

-  Don't exit silently if execv fails (i.e. returns).

-  Use an "odd" exit code when ForkAndExec terminates the child
   process, which is less likely to be confused with a real exit code
   from the executed command. Also log a warning if the special exit
   code is detected in the parent.

#codehealth

Test: atest -a art_standalone_dex2oat_cts_tests
  before and after https://r.android.com/3235770, and check logcat for
  messages.
Bug: 360737799
Change-Id: If2681d4b94e0ae433d23e27ad5800dd5a7eca1df

0 files changed, 0 insertions, 0 deletions