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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.
Define Segmentation The memory allocation method subject to “external” fragmentation is Segmentation.
How does user specify block to be fetched in direct access? By specifying the relative block number, relative to first block in file, which is block 0.
The field that consists of a segment index or an internal index is known as Target datum is field that consists of a segment index or an internal index.
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Explain Belady's Anomaly? Also called FIFO anomaly. Usually, on enhancing the number of frames allocated to a process virtual memory, the process implementation is faster, beca
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what are the threds in operating system?
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