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Special Forums UNIX and Linux Applications Daemonizing Problem - Serious Post 302808833 by DGPickett on Friday 17th of May 2013 03:29:53 PM
Old 05-17-2013
It is nice if a daemon has 1 as parent, by a killed parent shell. But a true daemon should not be in an interactive process group or related to a controlling terminal, so I often launched mine with at, crontab (auto restart as a bonus) or an ssh nohup that kills ssh after the nohup, or off an xtern that I then kill. Of course, it you have root you can have init.d or some daemon manager like src launch it for you on boot.

I used to lose my Xserver's mwm from ctrl-c SIGINT on the launching xterm; drove me nuts until I used the first xterm to launch everything and then killed it, making them all orphans, or devoted it to top.
 

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nice(1) 						      General Commands Manual							   nice(1)

Name
       nice, nohup - execute a command at a lower priority

Syntax
       nice [-number] command [arguments]

       nohup command [arguments]

Description
       The  command  executes command with low scheduling priority (Bourne Shell only).  If the number argument is present, the priority is incre-
       mented (higher numbers mean lower priorities) by that amount up to a limit of 20.  The default number is 10.

       The super-user may run commands with priority higher than normal by using a negative priority, for example, `--10'.

       The command executes command immune to hangup and terminate signals from the controlling terminal.  The priority is incremented by 5.   The
       command	should	be  invoked  from  the shell with an ampersand (&) in order to prevent it from responding to interrupts by or stealing the
       input from the next person who logs in on the same terminal.  The syntax of is also different.

Options
       -number		   Increments the priority by a specified number up to a limit of 20.  The default is 10.

Restrictions
       The and commands are particular to If you use then commands executed with an ampersand (&) are automatically immune to hangup signals while
       in the background.  There is a built-in command which provides immunity from terminate, but it does not redirect output to nohup.out.

       The  command  is built into with a slightly different syntax than described here.  The form ``nice +10'' nices to positive nice, and ``nice
       -10'' can be used by the superuser to give a process more of the processor.

Diagnostics
       The command returns the exit status of the subject command.

Files
       nohup.out standard output and standard error file under nohup

See Also
       csh(1), getpriority(2), renice(8)

																	   nice(1)
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