Hi, 

sometimes daemon dies silently, dont know why, dont know when, dont know where 
the coredump is. attached with a patch (made by "Peter Wang" 
<spwang@corp.netease.com>) to make the sysadm's life a little bit easier, by 
logging the coredump event in syslog (if user allows). 

when enabled (sysctl -w kernel.log_sig_exit=1), some syslog message will be 
generated if a process crash:

Nov  1 15:32:54 localhost kernel: pid 4649 (coredump), uid 0: exited on signal 
11 (core dumped)

and then the sysadm can react promptly.

trivial patch, but IMHO, very useful.

cheers,
  -- Pengcheng