barcode dll for vb.net Initialization, OpenBoot PROM, and Run Levels in Software

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Initialization, OpenBoot PROM, and Run Levels
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several options. You can use the l flag to prevent the recording of the system halt in the system log, which it normally attempts before halting the CPU. The n option prevents the refreshing of the superblock, which is performed by default, to prevent damage to mounted file systems. The most extreme option is q, which does not attempt any kind of fancy actions before shutting down the system and rebooting. In addition, reboot accepts the standard parameters passed to the boot command, if they are preceded by two dashes and are placed after the reboot parameters (described in the preceding paragraph) on the command line. For example, to perform a configuration reboot, without recording an entry in the system log, you could use the following command:
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# reboot -l -- -r
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Reconfiguration Boot
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Performing a reconfiguration boot involves updating the hardware configuration for the system. If you add new hardware to the system, other than a disk, you must bring the system down to the hardware maintenance state (level 0) before you can insert the new device. In addition, you must notify the system of a reconfiguration reboot either by booting from the OpenBoot PROM monitor with the command boot -r or by creating an empty file called /reconfigure before changing to run-level 0. You can achieve this by using the command touch /reconfigure. Be sure to remove the /reconfigure file after the system has been reconfigured (if necessary).
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The poweroff command is used to rapidly shut down the system and switch off power (like switching to run-level 5), without cycling through any intermediate run levels and executing the kill scripts specified for those run levels. This ensures that you can achieve a very fast shutdown when emergency situations dictate that the system cannot remain live, even with the risk of data loss. For example, if a system is under a denial of service attack, and the decision is made to pull the plug on the service, the poweroff command shuts it down much faster than init or shutdown. The CPU is halted as quickly as possible, no matter what the run level. The poweroff command has several options. You can use the l flag to prevent the recording of the system halt in the system log, which it normally attempts before halting the CPU. The n option prevents the refreshing of the superblock, which is performed by default, to prevent damage to mounted file systems. The most extreme option is q, which does not attempt any kind of fancy actions before shutting down.
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You can use the halt command to rapidly shut down the system, to the OpenBoot PROM monitor, without cycling through any intermediate run levels and executing the kill scripts specified for those run levels. Like the poweroff command, this ensures a rapid shutdown. Also, the halt command has the same options as poweroff.
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Installation
Examples
The following examples demonstrate how to use the OpenBoot PROM monitor effectively, and provide some real-world cases for starting up and shutting down a Solaris system.
Single-User Mode
If a system fails to start correctly in multiuser mode, it s likely that one of the scripts being run in /etc/rc2.d is the cause. To prevent the system from going multiuser, you can boot directly into single-user mode from the ok prompt:
INIT: SINGLE USER MODE Type Ctrl-d to proceed with normal startup, (or give root password for system maintenance):
At this point, you can enter the root password, and the user will be given a root shell. However, not all file systems will be mounted, although you can then check individual scripts for misbehaving applications.
Recovering the System
If the system will not boot into single-user mode, the solution is more complicated, because you cannot use the default boot device. For example, if an invalid entry has been made in the /etc/passwd file for the root user, the system will not boot into singleor multiuser mode. To recover the installed system, you need to boot the host from the installation CD-ROM into single-user mode. At this point, you can mount the default root file system on a separate mount point, edit the /etc/passwd file, and reboot the system with the default boot device. This sequence of steps is shown here, assuming that /etc is located on /dev/dsk/c0t0d0s1:
ok boot cdrom ... INIT: SINGLE USER MODE Type Ctrl-d to proceed with normal startup, (or give root password for system maintenance): # mkdir /temp # mount /dev/dsk/c0t0d0s1 /temp # vi /temp/etc/passwd # sync; init 6
If a system is hung and you cannot enter commands into a shell on the console, you can use the key combination STOP-A to halt the system and access the OpenBoot PROM monitor. If you halt and reboot the system in this way, all data that has not been written to disk will be lost, unless you use the go command to resume the system s normal operation. Another method of accessing a system if the console is locked is to telnet to
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