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Q. In some systems a subdirectory is able to be read and written by an authorized user just as ordinary files can be.
a. Explain the protection problems that could arise.
b. Suggest a scheme for dealing with every of the protection problems you named in part a.
Answer:
a. One piece of information reserved in a directory entry is file location. If a user could alter this location then he could access other files defeating the access-protection scheme.
b. Don't allow the user to directly write onto the subdirectory. Rather offer system operations to do so.
Let us consider the operation of the EPROM device in more detail. Consider the pining details below again Before we examine the interface means of the EPROM, it is worth
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Two Level Directory This kind of structure overcomes the problems of assigning unique names to the files. Thus there need not be any confusion among users. In this kind of s
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Q. Distinguish among PCS and SCS scheduling. Answer: PCS scheduling is completed local to the process. It is how a thread library schedules threads onto available LWPs. SCS sch
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Explain Wait for Graph a. Use a resource allocation graph to derive a wait-for graph. b. Wait-for graph acquired by making an edge from p 1 to p 2 iff p 1 is waiting for
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What is the use of boot block? For a computer to begin running when powered up or rebooted it requires having an initial program to run. This bootstrap program tends to be easy
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