UNIX & LINUX system programming.pdf - Google Drive

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EJ – 820

*EJ820*

VI Semester B.E. (CSE/ISE) Degree Examination, January 2013 (2K6 Scheme) CI 6.5 : UNIX/LINUX SYSTEM PROGRAMMING Time : 3 Hours

Max. Marks : 100

Instruction : Answer any five full questions selecting atleast two from each Part. PART – A 1. a) List and explain the following feature test macros defined by POSIX. i) – POSIX – JOB – CONTROL ii) – POSIX – CHOWN – RESTRICTED iii) – POSIX – NO – TRUNC iv) – POSIX – SAVED – IDS. b) Discuss the role of Inodes in UNIX system.

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2. a) Explain the following file APIs. i) read ii) write iii) create. b) Explain the concept of file locking mechanism.

12 8

3. a) Explain the role of the following data structures used in file manipulation. i) file description table ii) file table iii) inode table.

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b) Differentiate between Hard and symbolic links with examples.

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4. a) List and explain the different versions of the exec system call.

10

b) Explain the role of UNIX shell command pipes. Give an example.

5

c) List the process attributes that cannot be queried but can be changed.

5 P.T.O.

EJ – 820

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*EJ820*

PART – B 5. a) Give the meaning of the following signals.

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i) SIGALRM ii) SIGABRT iii) SIGINT iv) SIGSEGV v) SIGCHLD. b) Implement a C program that uses the sigaction API that is called by a process to setup a signal handling method for each signal it wants to deal with. 10 c) Write a note on tegetpgrp and tesetpgrp functions.

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6. a) Explain the different events that may occur during the handling of SIGCHILD signal generated by the Kernel. 10 b) Write a C program that illustrates how to set up a real-time clock interval timer using the alarm API. 7. a) Explain the following message APIs

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i) Msg get ii) Msg snd iii) Msg rcv iv) Msg ctl. b) List and briefly explain the data associated with one semaphore set stored in each entry of a semaphore table. 10 8. Write short notes on :

(5×4=20)

i) UNIX kernel support for processes ii) Kill and alarm APIs iii) I/O redirection iv) Exec system call. ———————