Is there any other way to trigger log reopen beside kill -USR1?

[Liu Haifeng]

Hi all,

In the common case, people rotate access log like this:

mv access.log access.XXX.log
kill -USR1 <nginx pid>

In my case, I have to do something like this:

if [ -f "access.log" ]; then
  mv access.log access.20130121.log
fi

kill -USR1 <nginx pid>
{wait until access.log was generated}
mv access.log access.20130122.log

My goal is make the "current" log file renamed with the date pattern immediately, not after one day or other period. Well, my script seams OK, but for a production script, I still worry about that is there any "unexpected" trigger(other than send usr1 signal externally) can make nginx reopen the log file? Will there be any inside reopen action in the future?