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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LEARN ABOUT OPENSOLARIS
avahi-daemon-bridge-dsd
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)