This article is from a FAQ concerning SCO operating
systems. While some of the information may be applicable to any OS,
or any Unix or Linux OS, it may be specific to SCO Xenix, Open
There is lots of Linux, Mac OS X and general Unix info elsewhere on
this site: Search this site is the best
way to find anything.
The /etc/rc[0-2] script scripts use the "prc_sync" command to
execute the scripts in the /etc/rc[0-2].d directories. By default,
these are run with an argument of "120", which tells prc_sync that
the scripts are expected to finish in 2 minutes or less. This time
out is managed by prc_sync setting OS level "alarms" ( man S
alarm). It is the failure of the script to complete in the allotted
time that causes the alarm not to be shut off, and that's when you
see "Alarm Call" on the screen.
You can find out what scripts did not complete by examining the
"prc_sync" log file in /etc/rc0.d/messages and