Core: added signal name to "signal process started" logging

[Xiaochen Wang]

On Sat, Dec 20, 2014 at 1:27 AM, Maxim Dounin <mdounin at mdounin.ru> wrote:
> Hello!
>
> On Thu, Dec 18, 2014 at 12:05:01PM +0800, Xiaochen Wang wrote:
>
>> It is useful to know which signal was sent to nginx master when we analyzed
>> error.log.  If error_log level is warn/error/crit/alert/emerg, we could not
>> know this information from nginx master/worker error log.
>
> Adding more logging into signal process won't help, as signal
> process is not the only way to send signals to nginx.  The main
> purpose of signal process is to allow sending signals on Windows,
> where there is no "kill" to do this.
Yes, you're right. This patch can only get message in signal process.
The signals sent from other process cannot be logged.
>
> --
> Maxim Dounin
> http://nginx.org/
>
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