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Top Forums Programming How to find if a process a daemon ? Post 302212560 by vino on Monday 7th of July 2008 10:06:53 PM
Old 07-07-2008
How to find if a process a daemon ?

I have a scenario where I need to find if a process is a daemon process or not. This check needs to be done from within the process. I know there are no direct API's to do so. I have explored these options.

1. ctermid() - this can be unsuccessful as per the man pages
2. int devtty; if ((devtty = open ("/dev/tty", O_RDWR)) < 0) then it is a daemon. Are there any other cases, where this may not be true ?
3. Since setsid() is used to detach from a terminal, perhaps getsid() can be used to check for process group leader and session leader.
4. Look if parent pid is 1 or not. Can a daemon process have a ppid other than 1 ?

Are there more options ? I dont know if there is a best way to do this, but what would be the most appropriate way ?
 

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avahi-daemon-bridge-dsd(1)				      General Commands Manual					avahi-daemon-bridge-dsd(1)

NAME
avahi-daemon-bridge-dsd - The Avahi daemon bridge to dsd SYNOPSIS
avahi-daemon-bridge-dsd [options] avahi-daemon-bridge-dsd --kill avahi-daemon-bridge-dsd --check DESCRIPTION
The daemon implements a DBUS interface which provides a rich object oriented interface to DBUS enabled applications which browse for or register for services. Instead of implementing Apple's ZeroConf architecture (also known as "Rendezvous" or "Bonjour") it makes calls to the DNS Service Discovery API provided by Bonjour and so functions as a Bonjour client. OPTIONS
-D | --daemonize Daemonize after startup. Implies --syslog -s | --syslog Log to syslog instead of STDERR. Implied by --daemonize --debug Increase verbosity to debug level --no-drop-root Don't drop root priviliges after startup and don't require daemon to be started as root. We recommend not to use this option. --no-chroot Don't chroot(2) the daemon. This option is only available when compiled with chroot() support. --no-proctitle Don't change the process name while running. Unless this option is specified avahi will reflect it's current state and selected host name in the process title. -k | --kill Kill an already running avahi-daemon-bridge-dsd. (equivalent to sending a SIGTERM) -r | --reload Tell an already running avahi-daemon-bridge-dsd to reread the files from /etc/avahi/services/. (equivalent to sending a SIGHUP) -c | --check Return 0 as return code when avahi-daemon-bridge-dsd is already running. -h | --help Show help -v | --version Show version information FILES
/etc/avahi/hosts: additional static hostname mappings to publish in mDNS, see avahi.hosts(5) for more information. /etc/avahi/services/*.service: static service definitions, see avahi.service(5) for more information. SIGNALS
SIGINT, SIGTERM, SIGQUIT: avahi-daemon will shutdown. This is issued by passing --kill to avahi-daemon. SIGHUP: avahi-daemon-bridge-dsd will reload and static service definitions from /etc/avahi/services/. SEE ALSO
COMMENTS
This man page was written using xml2man(1) by Padraig O'Briain. Manuals User avahi-daemon-bridge-dsd(1)
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