Ability to specify the pidfile via args in FreeBSD

[tidwall]

Currently the pidfile must be managed outside the application. Adding an arg to the startup process will streamline this process. See #19.

[tidwall]

@olevole I was thinking I would add a parameter named --pidfile path. When provided the process would daemonize. Does this seem like a reasonable approach?

[olevole]

@tidwall Absolutely! Currenlty, i've made rc.d script for FreeBSD:

http://pastebin.com/jPmpqrwx

where i got pid from daemon(8). It is necessary for correct stop command; with --pidfile tile38 would be self-sufficient for rc.d subsystem.

[tidwall]

@olevole Apparently daemonizing a Go app is a little more challenging that I expected. I was hoping for a simple solution by just forking and rerouting logging and such. But fork and posix threads don't always play well with Goroutines. It sometimes works, but isn't totally stable.

There's a whole long discussion about it dating back to 2009. golang/go#227

There may still be a way yet, but it may take more tinkering on my side. Sorry for the delay on this. I'll keep you posted when I find a stable solution.

[olevole]

Thank you very much!

[tidwall]

You're welcome and sorry about the delay.