02-27-2002
You're way off the mark. Asking what a daemon does in like asking what a program does....the answer depends on the specific example.
cron, inetd, syslogd all run as daemons and they do a lot. But it is easy to write a daemon that does nothing but just monitor something. It's also easy to write a daemon that does nothing at all.
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LEARN ABOUT DEBIAN
xtelld
XTELLD(8) System Manager's Manual XTELLD(8)
NAME
xtelld - daemon receiving messages from xtell(1) clients
SYNOPSIS
xtelld [options]
DESCRIPTION
xtelld is daemon receiving messages from the xtell(1) client and displaying them to apropriate user.
OPTIONS
--help Short help
--alone
Force server to run standalone
--inetd
Force server to act as service of inetd
--version
Print version information and exit.
-sX Lifetime for spawned services (in seconds) ex: -s25 maintain connections for up to 25 seconds
-mX Spawn no more than X children services at a time ex: -m15 service no more than 15 requests at once. Note: ignored if inetd service
-pX Use port X, default: 4224
-n Do not lookup addresses, use IP numbers instead
USAGE
Xtell daemon can run either from inetd(preferred) or from command line. If you decide to start it from inetd, add this line to /etc/ser-
vices :
xtell 4224/tcp # xtell server
and this line to /etc/inetd.conf :
xtell stream tcp nowait nobody.tty /usr/sbin/tcpd /usr/local/sbin/xtelld
Notice that the entries are separated by tabs, not spaces. Restart inetd with killall -HUP inetd
What to do if you are a normal user and want to run xtell daemon:
You can't run it from inetd, obviously. Just start ./xtelld to use xtell on default port (4224). In this case, xtell can write messages
only to you. If there is another user on that system willing to get messages, either s/he starts xtelld on another port (e.g. ./xtelld
-p4225), or makes his/her tty writable by you (e.g. chmod a+rw /dev/tty* /dev/pts/*)
AUTHOR
Radovan Garabik (garabik@fmph.uniba.sk)
SEE ALSO
xtell(1), write(1), talk(1), talkd(8), tty(1)
XTELLD(8)