Can process be reloaded by PID?

I run a daemon which cannot be restarted via init.d or service command.

Is there a way to restart a process just by passing a process id to some command?

Solution 1:

Killing or Reconfiguring a Daemon without Restarting

kill -HUP 1721

Restarts the process 1721 by sending the hangup signal.

killall -HUP inetd

Causes the daemon to reload its config file by sending the hangup signal.

killall -1 inetd 

Restarts inetd by sending signal number 1 which is the hangup signal.

The difference between this example and the previous one is the signal is called by name here rather than number.

Reference: http://www.comptechdoc.org/os/linux/usersguide/linux_ugprocesses.html