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?
Ubuntu – Can process be reloaded by PID
process
Related Solutions
The 60+ threads is a bug
with ConsoleKit.
jobs will only list the jobs that are associated with the shell that the jobs command is run in, and similarly fg and bg only work with processes on the same process tree as the current shell. In the context of this question, the job you want to attach to was started with /etc/rc.local, so that shell is not the current one you are in.
You could start the process from /etc/rc.local with the screen command (https://help.ubuntu.com/community/Screen) - this will start it up attached to a pseudo terminal, then you can later use screen again to attach to that terminal and type characters at the running program.
Install screen using apt-get, then type man screen to see all the options. I'm not sure exactly what you should put in rc.local and don't have time right now to experiment, but may update this answer later.
Best Answer
Killing or Reconfiguring a Daemon without Restarting
Restarts the process 1721 by sending the hangup signal.
Causes the daemon to reload its config file by sending the hangup signal.
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