Techniques that attack the first two conditions are known as deadlock avoidance schemes. One, for example, attacks the second condition by requiring each process to request all its resources at one time. BT503 Handouts PDF Another scheme attacks the first condition, not by removing the competition directly but by converting non-sharable resources into sharable ones. For example, suppose the resource in question is a printer and a variety of processes require its use. Each time a process requests the printer, the operating system could grant the request.
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However, instead of connecting the process to the printer’s device driver, the operating system would connect it to a device driver that stores the information to be printed in mass storage rather than sending it to the printer. Thus each process, BT503 Handouts PDF thinking it has access to the printer, could execute in its normal way. by name and password) during the login procedure.In particular, auditing software may expose a flood of attempts to log in using incorrect passwords, indicating that an unauthorized user may be trying to gain access to the computer.
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Once this contact is established, the administrator can alter settings within the operating system, BT503 Handouts PDF modify critical software packages, adjust the privileges granted to other users, and perform a variety of other maintenance activities that are denied to normal users.
From this “lofty perch,” the administrator is also able to monitor activity within the computer system in an effort to detect destructive behavior, whether malicious or accidental. BT503 Handouts PDF To assist in this regard, numerous software utilities, called auditing software, have been developed that record and then analyze the activities taking place within the computer system.
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