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If the file /etc/inittab does not exist during booting, the superuser will be asked to manually enter the desired run level for the system If this event ever occurs unexpectedly for a multiuser system, it is a good strategy to enter single-user mode (by typing s) to perform maintenance on the /etc/inittab file Another potential problem is if /etc/inittab does contain an empty rstate value in the initdefault entry: the system will go to firmware and continuously reboot! If this occurs, exit from the operating system into the OpenBoot PROM monitor by holding down the STOP key and pressing A You can now boot directly into single-user mode and add an appropriate rstate entry to the /etc/inittab file Safeguards are built into init; however, if the system discovers that any entry in /etc/inittab is respawning rapidly (ie.

, more than five times per minute), init assumes that a typographical error has been made in the entry, and a warning message is printed on the system console init will then not respawn the affected entry until at least five minutes has elapsed since the problem was identified After entering a multiuser run level for the first time since booting from the OpenBoot PROM monitor, init reads any appropriate boot and bootwait entries in /etc/inittab This provides for basic initialization of the operating system, such as mounting file systems, which is generally performed before users may be allowed to operate on the system In order to spawn processes specified in /etc/inittab, init reads each entry and determines the process requirements for the commands to be executed For example, for entries that must be respawned in the future, a child process is created using fork().

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After reading all entries and spawning all processes, init simply waits until it receives a signal to change the system s init state (this explains why init is always visible in the process list) /etc/inittab is always reread at this point to ensure that any modifications to its specified behavior are used In addition, init can be initialized at any time by passing a special parameter to force rereading of /etc/inittab:.

When init receives a valid request to change run levels, it sends a warning signal to all affected processes and then waits five seconds, after which it sends to any processes that do not behave well a kill signal to forcibly terminate them. Affected

4:

Figure 11-3 Using a glass rod to spread the suspension onto the plate. Image courtesy Greg P. Smestad.

processes are those that will be invalid under the target init state (e.g., when going from multiuser to single-user mode, daemons started in multiuser mode will be invalid). Because five seconds may not be sufficient to shut down an entire database server and close all open files, it is best to ensure that such activities precede any change of state that affects the main applications running on your system (e.g., by executing the appropriate command in /etc/init.d with the stop parameter). /sbin/init can be executed only by a superuser, because changes in the system s init state executed by a normal user could have serious consequences (e.g., using init to power down a live server). Thus, it is always wise to ensure that file permissions are correctly set on the /sbin/init binary. The Command Reference section later in the chapter contains further details about the format of the /etc/inittab file.

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