Download JNTUH MCA 3rd Sem R13 2017 August 813AM Linux Programming Question Paper

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Code No: 813AM R13

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JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

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MCA III Semester Examinations, August - 2017

LINUX PROGRAMMING

Time: 3 Hours Max. Marks: 60

Note:

This question paper contains two parts A and B.

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Part A is compulsory which carries 20 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 8 marks and may have a, b, c as sub questions.

PART - A

5 x 4 Marks = 20

1. Write a bash script that displays a list of all the directory files in the current directory.[4]
2. What are the differences among stat family (stat, fstat and lstat) of functions? [4]

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3. What are the differences between fork( ) and vfork( ) functions? [4]
4. Give the syntax of semop( ) function. What are its uses? [4]
5. Draw a diagram that shows the calling sequence of socket system calls for connection oriented communication between a Client and a Server. [4]

PART -B

5 x 8 Marks = 40

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1. Explain with examples the quoting methods in shell.

   Write an awk script to find the number of characters, words and lines in a file. [4+4]

   OR

   Explain the purpose of following commands:

   1) chmod ii) tar

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   Write a bash script that uses a function to find the factorial of a number. [4+4]

2. Write a C program that takes a file name as command-line argument and displays the following information on the file:

   1) file type ii) last access time. [4+4]

   OR

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   Write a C program to display all the directory files in the current directory.

   What is the main difference between mandatory file locking and advisory file locking?

   [4+4]

3. Explain with examples the different ways in which a process can respond to signals.

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   Why were the signal facilities provided by Unix unreliable in older versions of Unix?

   [4+4]

   OR

   When a child process is created, what resources are inherited from its parent? What attributes are different between the parent and the child process?

   Explain with syntax the purpose of kill( ) function. [4+4]

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4. How are the named and unnamed pipes created? What are the differences between them?

   Explain with syntax the purpose of popen( ) and pclose( )functions. [4+4]

   OR

   Explain with syntax the purpose of the following message queue functions:

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   a) msgget( ) b) msgsnd() c) msgrcv() d) msgctl( ) [8]

5. Write C Programs (Send.c and Recv.c) to perform the following:

   One process reads a string from standard input device into a Shared memory segment.

   Another process writes the same string from the Shared memory segment to the standard output device. [8]

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   OR

   Write C Programs (Server.c and Client.c) for connection oriented communication between Client and Server processes to perform the following using sockets in the internet domain:

   Client process sends a string to the Server process. The Server process receives the string, reverses it and sends it back to the Client process. [8]

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