ADVANCED UNIX PROGRAMMING. ( Common to Computer Science &
Engineering, Information Technology and Computer Science & Systems
Engineering).
Set No. 1
Code No: RR320505
III B.Tech II Semester Supplementary Examinations, Aug/Sep 2007 ADVANCED UNIX PROGRAMMING ( Common to Computer Science & Engineering, Information Technology and Computer Science & Systems Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. Write short notes on the following: (a) Process utilities (b) Disk utilities
[8+8]
2. What is the purpose of grep command? Explain the various options available with the grep command with an example. [4+8+4] 3. Define file. Explain in detail about the various files.
[4+12]
4. Write a program that calls fork and has the child create a new session. Verify that the child becomes a process group leader, and that the child no longer has a controlling terminal. [16] 5. (a) Write in detail about the interrupted system calls. (b) Write about the kill and raise functions.
[8] [4+4]
6. (a) Write a function to test for a locking condition. (b) Write about Dead lock.
[8+8]
7. (a) Explain “popen” and “pclose” functions. (b) What are the named pipes? Explain in detail.
[4+4] [3+5]
8. What is shared memory? What is the importance of it? Explain in detail about the process of “Allocating a shared memory segment”. [3+5+8] ⋆⋆⋆⋆⋆
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Set No. 2
Code No: RR320505
III B.Tech II Semester Supplementary Examinations, Aug/Sep 2007 ADVANCED UNIX PROGRAMMING ( Common to Computer Science & Engineering, Information Technology and Computer Science & Systems Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. Explain the following commands with syntax (a) ln (b) mv (c) rm (d) ulimit
[4x4=16]
2. Write a script that accepts a file name as argument and displays the last modification time, if the file exists and a suitable message if it doesnt. [16] 3. Define system call. Explain in detail about the working and syntax of file structure related system calls. [4+12] 4. What is meant by a process? Explain any four process related system calls with syntax. [4+3x4=16] 5. (a) Write about the slow system calls. (b) Write about abort and system functions.
[8] [4+4]
6. (a) Explain in detail about the requirement of file locking mechanism. (b) Explain in detail about fcntl( ) function.
[8+8]
7. (a) Explain about the “Effect of O-NDELAY flag on PIPEs and FIFOs”. (b) Explain, How to obtain the list of login names in sorted order into the file “usersinfo.dat” using pipes. [8+8] 8. (a) Write about Timing comparison of “Message Queues Vs. Stream Pipes”. (b) Explain about the Message Queue id. (msqid ds) data structure. ⋆⋆⋆⋆⋆
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[8+8]
Set No. 3
Code No: RR320505
III B.Tech II Semester Supplementary Examinations, Aug/Sep 2007 ADVANCED UNIX PROGRAMMING ( Common to Computer Science & Engineering, Information Technology and Computer Science & Systems Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. Explain the following commands with syntax (a) umask (b) find (c) mount (d) unlink
[4x4=16]
2. What is the purpose of Stream editor? Explain which option should be used to place the contents of a file f1 after line. [4+12] 3. Explain the following system calls with syntax: (a) mkdir() (b) rndir() (c) chdir() (d) symlink()
[4x4=16]
4. Write short notes on the following: (a) Process termination (b) Zombie process
[8+8]
5. (a) What is signal handler? Explain how to install a signal Handler? (b) Write in detail about “Reliable signal Handling”.
[3+5] [8]
6. (a) With an example, Explain about the setting a lock.
[3+5]
(b) With an example, Explain about clearing a lock.
[3+5]
7. (a) Explain, “about the events occurred, when you call the popen( ) and pclose( ) functions”? (b) Explain about the semget( ), semctl( ) and semop( ) functions.
[7+9]
8. (a) With an example, Explain in detail about the process of writing Messages on to a Queue. [4+4] (b) With an example, Explain in detail about the process of Reading a Message from the Queue. [4+4] ⋆⋆⋆⋆⋆ 1 of 1
Set No. 4
Code No: RR320505
III B.Tech II Semester Supplementary Examinations, Aug/Sep 2007 ADVANCED UNIX PROGRAMMING ( Common to Computer Science & Engineering, Information Technology and Computer Science & Systems Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. Explain in detail about the UNIX Operating system structure.
[16]
2. Explain the following commands with syntax (a) sort (b) cut (c) pg (d) comp
[4x4=16]
3. Explain the following system calls with syntax: (a) fseek() (b) fgetc() (c) getc() (d) getchar()
[4x4=16]
4. Suppose a process does not wish to block until its children terminate. How can it ensure that child processes are cleaned up when they terminate? [16] 5. (a) Explain about the “features added to enhance signal reliability”. (b) Explain about “abort” and “kill” functions.
[8] [4+4]
6. (a) Write about Advisory locking versus mandatory locking. (b) Write about file locking versus Record Locking. 7. (a) What are the named pipes? Explain in detail.
[8+8] [3+5]
(b) Explain, in detail about the client - server communication using FIFOS.
[8]
8. (a) Draw & Explain about the “Message Queue structures in the Kernel” [3+5] (b) With an example, Explain in detail about the process of Reading a Message from the Queue. [5+3] ⋆⋆⋆⋆⋆
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