[nginx] nginx.pid doesn't exist

[洪志道]

Hi!

What causes the nginx.pid file doesn't exist but the master and worker
process are still running?

This situation happens when we upgrade nginx.

kill -USR2 pid;
sleep n;
kill -QUIT oldpid;

I check the code in ngx_pross_cycle.c and ngx_process.c, it seems nginx
dose perfectly guarantee that pid file and master process are always exist
together.

Thanks so much.
B.R.
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