Running xscreensaver in the background after resume from hibernate

Question

I'm using hibernate-script with my tuxonice kernel. One of the things that annoys me about xscreensaver is how when I resume its always running (because the requisite time has passed), so I have to type my password again, having just typed it at BIOS level.
So I killall xscreensaver in an OnSuspend in /etc/hibernate/common.conf. However, restarting xscreensaver doesn't go to the background. What I'm using is this:-
OnResume 20 sudo -b -u MYUSERNAME /usr/bin/xscreensaver
However the terminal that I typed sudo hibernate from never returns, I have to killall xscreensaver from another terminal to get it to release. The problem does not occur when I login to a vt as root and run the same command.
Any suggestions?

Answer 1

I just registered for the forum so I could toss in my solution, so I hope this is what you're looking for. I fork the process and use the 'disown' command. I also use Dan Bernstein's 'setuidgid' utility because I couldn't get it to work with su (I didn't try very hard):
OnResume 70 setuidgid USERNAME xscreensaver > /dev/null 2>&1 & disown
This works for me even if I execute hibernate and resume from a terminal, despite the fact that II get a "can't find display" error from the terminal.
Of course, the stdout and stderr redirect to /dev/null is not necessary. The 'disown' command removes the subprocess from the process table, so that the subprocess is no longer a child of the parent. It is cast off, essentially. I also use a similar command for restarting gkrellm because gkrellm sometimes fails to recognize my second battery after resume.
One quirk I have found is that hibernate will halt if a kill or killall fails. I thought this was happening because the kill command had returned a non-zero exit status. But I just discovered that forking a kill command prevents hibernate from halting when a kill fails, as in:
OnSuspend 20 killall xscreensaver > /dev/null 2>&1 &