Unix and Network Programming Nov/Dec 2009

M.C.A. Degree Examination,NOV/DEC 2009
                   Fourth Semester
MC 1751 - UNIX AND NETWORK PROGRAMMING
                (Regulation-2005)

ANSWER ALL QUESTIONS
PART - A

1. How is a system call different from library function ?
2. What happens when the sticky bit of executable program is set ?
3. What are the fields present in the environment list ?
4. How can a process obtain its saved set-user-ID?
5. What are the limitations of pipes?
6. What are the steps involved in obtaining a shared resource by a process?
7. What all packets are received by a raw socket waiting at protocol 17 ?
8. What is the use of htonl() ? Give an example ?
9. Under what condition ICMP TIME EXCEEDED message is raised ?
10. What is the difference between well-known port number and ephemeral port number ?

PART - B

11.(a).(i). What is the goal of buffering provided by standard I/O library ? Explain the various types of buffering ?(3+6)
11.(a).(ii). What are the various types of files supported by UNIX ? Explain. (7)
(Or)
11.(b).(i). Explain the various data structures maintained by the unix system with regard to file sharing.(9)
11.(b).(ii). How is remove() different from unlink() ? Give the Syntax to both functions. (4+3)

12.(a). Explain with a neat diagram how a 'C' program is started and terminated with necessary function calls required. (16)
(Or)
12.(b). Write a note on the following with examples.
   (i). Unreliable signals.
   (ii). Reentrant functions
   (iii). System() functions

13.(a).(i). List the advantages and disadvantages of system V IPC mechanisms.(8)
13.(a).(ii). Compare the different forms of System V IPC. (8)
(Or)
13.(b). Explain the operation of Semaphore with an example application. (16)

14.(a). Write a note on the following function calls by specifying Syntax,Operation  and Necessity.
   (i). bind()            (4)
   (ii). inet_pton()      (4)
   (iii). Connect()       (4)
   (iv). Recvfrom()       (4)
(Or)
14.(b).(i). List and explain any socket options. Specify the function calls used to set and get the various socket options.(8)
14.(b).(ii). Explain I/O Multiplexing.(8)

15.(a). Explain the implementation of the tool,ping with necessary function.(16)
(Or)
15.(b). Write a UDP based echo server. Test its functionality with an echo client to calculate the RTT between the client and server.(16)

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