> well openBSD is so neat it provides a nice call: > > http://www.openbsd.org/cgi-bin/man.cgi?query=pidfile&apropos=0&sektion=0&manpath=OpenBSD+Current&arch=i386&format=html > > but i failed to patch :'( this make the dhclient quit instead of > going background, the fact there is two process may also explain why > there is no pidfile. One is root he other dropped privilege, all of > this is just giving me a headache at the moment.
pidfile() is a dangerous subsystem. The files stay around long after the process has died. There is no interlock. If you signal a process lists in a pidfile, who knows what you are sending a signal to. Since the signals are often termination related, this can have dangerous effects. We don't add more pidfile use, we actually remove them where we can. This mechanism has applicability in some situations, but in the big picture it is sloppy practice.
