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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.
Write a C program that illustrates the creation of child process using fork system call. One process finds sum of even series and other process finds sum of odd series.
with the aid of diagrams describe the following os structures monolithic , layered, client server
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