Github user jaaju commented on the issue:
https://github.com/apache/trafficserver/pull/1457
@zizhong you need to call `exit` for normal process termination in case of
SIGTERM so ASAN leak detection report is available. But since you can not call
`exit` from the signal handler, what @jpeach suggests is to merely take note of
the delivered signal and call `exit` later when normal process execution
resumes. The pipe is a mechanism to wake up the code that calls `exit`, and you
can write to the pipe calling only async-signal-safe routines.
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