Download JNTUH MCA 4th Sem R15 2019 December 824AB Linux Programming Question Paper

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Code No: 824AB R15

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PART - A 5 x 5 Marks =25

1. Explain the system commands in awk. 5

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2. Explain the support given by the kernel for files in detail. 5
3. Discuss in detail about process creation mechanism. 5
4. Describe the API provided by Linux for semaphores. 5
5. Explain the usage of socket using client-server message handling example. 5

PART -B 5 x 10 Marks =50

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1. a) List and explain various meta characters available in shell programming. [5+5]
   b) Write an awk script to perform simple arithmetic operations.
   OR
   Write a shell script that deletes all lines containing a specified word in one or more files supplied as arguments to it.
2. a) With an example script explain the differences between ‘for’ and ‘for-each’ Statement. [5+5]
   

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   b) Write the syntax of the following system calls and explain with an example code.
       i) telldir     ii) mkdir
   OR
   What do you mean by a hole in a file? How does the use of Iseek() result in hole in a file? Explain with an example program. [5+5]
3. Discuss in detail about file ownership commands. [10]
   

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   OR
   Write a C program that accepts two small numbers as arguments and then sums the two numbers in a child process. The sum should be returned by child to the parent as its exit status and the parent should print the sum.
4. a) Differentiate between reliable and unreliable signals. [5+5]
   OR
   b) Describe the following functions.
   

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       i) kill     ii) raise     iii) alarm     iv) pause
5. a) What is orphan process? Write a program to illustrate the orphan process. [5+5]
   OR
   b) Define unnamed pipe. How do we create unnamed pipe? Explain the limitations of unnamed pipe.
6. a) Describe the operations of semop() with a sample C program. [5+5]
   

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   OR
   b) Describe various APIs used to implement client/server communication between two unrelated processes in a system using FIFOs with an illustrative example code.
7. a) Explain in detail about kernel support for semaphores. [5+5]
   OR
   b) Explain briefly about the following socket APIs with clear syntax.
   

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       i) accept()     ii) connect()
8. a) Describe socket system calls used for connectionless protocol with syntax and usage. [5+5]
   OR
   b) Explain Socket address structures based on Unix domain and Internet domain.
9. a) Explain briefly about the following Sockets APIs with clear syntax.
   

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       i) Socket()     ii) bind() [5+5]

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