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Unix Internals CS2028 MJ2014 6th Semester Question Paper

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Computer Science and Engineering
3rd year
6th Semester
May /June 2014 Examination Question Paper
CS2028/CS 605/10144 CSE 22 Unix Internals

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Part A

1. What are the types of commands allowed by the shell.
2. What happens during a context switch.
3. List the information maintained in the status field of the buffer header.
4. If a logical block on a file system can hold 2K bytes and a block number is addressable by a 32 bit integer,how many block numbers can a disk block hold?
5. Can a file that is already opened be unlinked?why?.
6. Give the use of the lseek system call.
7. what comprise the register context of the process?
8. What is the use of the dub system call?.
9. How does the age bit present in page table help the page stealer process?
10. List any two functions of a line discipline.





Part B

11 a) Explain the architecture of the UNIX operating system with a block diagram.(16)
Or
b) Write notes on.
1] Interrupts and exceptions(4)
2] processor execution levels(4)
3] User module and kernel module(4)
4]User file descriptor table and file table(4)

12 )a) Explain the different scenarios that the kernel may follow in get blk algorithm to allocate a buffer for a disk block(16)
Or
b)With the appropriate diagrams explain the ialloc algorithm which assigns new inodes.(16)

13) a)Explain the implementation of the following(16)
1]open.
2]Write.
Or
b) What are pipes?Explain how pipes are used for interprocess communication.Discuss about the issues in reading from and writing into pipes.(16)

14) a)Draw the process state transition diagram and explain yhe different states in which a process can be during its lifetime.(16)
Or
b) Explain the implementation of the following system calls.(16)
1]Wait.
2]Exec.

15)a) 1)What is swapping Explain how swap space is managed on a swap device.(8)
2) Differentiate the implementation of the fork and vfork system calls in a paging system.(8)
Or
b)1] Write short notes on disk drivers (8)
2]Explain the algorithm for closing a device(8)

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