Download VTU BE 2020 Jan CSE Question Paper 15 Scheme 7th Sem UNIX System Programming

MEE
USN
Seventh Semester B.E. Degree Examination, Dec.2019/Jan.2020
UNIX System Programming
Time: 3 hrs. Max. Marks: 80

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Note: Answer any FIVE full questions, choosing ONE full question
.
from each module.
? ...
Module-1

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a. List the differences between ANSI C and KandR(K & R)C. Discuss any two differences in
detail. (08 Marks)
b. What is the necessity of sysconf( ), pathconf( ) and fpathconf( ) functions? Write a C/C++
programme to illustrate the same. (08 Marks)
I.)

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?
6)

C.
0

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I)
OR
- 5 d 2 a. What is error status code? List and explain the meaning of any 4 error status codes.
75
elJ

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(06 Marks)
? oc
b.
"E List the common functions performed by UNIX APIs. (04 Marks)
rsi

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F
r: ?I-
c.
Write a C program to illustrate the following using C preprocessor symbols.
i) to check whether the complier is ANSI C complaint

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ii) to get the physical line number of a source file
iii) to get file name
iv)

to get date and time. (06 Marks)

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c '
7
4
?
.

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2 0-
c.,
Module-2
O

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-
0 a. any 3 List four differences between hardlink and soft link (symbolic link).
? c
(04 Marks)
cz

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b. Find the actual file permission if open( ) is called to create a file /usr/names?txt. Assume
default file permission is 0666 and umask of the calling process is :
umask (S_ IWOTHIS ? IXOTH IS IWGRP). (04 Marks)
0
O

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c.
Discuss the working of ',seek' system call. Explain all the parameters in detail. (08 Marks)
z
i

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o
' t)
C OR
. 0
4 a. Discuss how 'link' and 'unlink' system calls can be used to implement 'my' command in

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rT,
UNIX.
(06 Marks)
= ?
ct

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b. Using suitable diagram show the process's FDT (File Descriptor Table), FT (File Table) IT
?
aj

8

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7
.
3
.
3

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(Incode Table) contents after the operation : "A process has opened 3 fi les ? `xyz' for read
t+-
tf.)
0
only, `abc' for read write and `abc' again for write only". Discuss the same in detail.

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-
(10 Marks)
a
O ;
2

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=-
o
Module-3
5 a. Discuss how a C program is started and terminated in various ways along with suitable
diagram.

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(10 Marks)
O b. Write a C program to avoid Zombie process by forking twice. (06 Marks)
t ?3
OR
6 a.

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What is the use of `setjmp' and `Iongjmp' function? Write a C program to illustrate the
same.
(08 Marks)
b. What is Job control? List the 3 forms of support needed for Job control. (05 Marks)
c. Compare 'fork' and ?vfork' systemcall. (03 Marks)

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MEE
USN
Seventh Semester B.E. Degree Examination, Dec.2019/Jan.2020

--- Content provided by FirstRanker.com ---

UNIX System Programming
Time: 3 hrs. Max. Marks: 80
Note: Answer any FIVE full questions, choosing ONE full question
.
from each module.

--- Content provided by FirstRanker.com ---

? ...
Module-1
a. List the differences between ANSI C and KandR(K & R)C. Discuss any two differences in
detail. (08 Marks)
b. What is the necessity of sysconf( ), pathconf( ) and fpathconf( ) functions? Write a C/C++

--- Content provided by FirstRanker.com ---

programme to illustrate the same. (08 Marks)
I.)
?
6)

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C.
0
I)
OR
- 5 d 2 a. What is error status code? List and explain the meaning of any 4 error status codes.

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75
elJ
(06 Marks)
? oc
b.

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"E List the common functions performed by UNIX APIs. (04 Marks)
rsi
F
r: ?I-
c.

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Write a C program to illustrate the following using C preprocessor symbols.
i) to check whether the complier is ANSI C complaint
ii) to get the physical line number of a source file
iii) to get file name
iv)

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to get date and time. (06 Marks)
c '
7
4

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?
.

2 0-
c.,

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Module-2
O
-
0 a. any 3 List four differences between hardlink and soft link (symbolic link).
? c

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(04 Marks)
cz
b. Find the actual file permission if open( ) is called to create a file /usr/names?txt. Assume
default file permission is 0666 and umask of the calling process is :
umask (S_ IWOTHIS ? IXOTH IS IWGRP). (04 Marks)

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0
O
c.
Discuss the working of ',seek' system call. Explain all the parameters in detail. (08 Marks)
z

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i

o
' t)
C OR

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. 0
4 a. Discuss how 'link' and 'unlink' system calls can be used to implement 'my' command in
rT,
UNIX.
(06 Marks)

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= ?
ct
b. Using suitable diagram show the process's FDT (File Descriptor Table), FT (File Table) IT
?
aj

--- Content provided by FirstRanker.com ---

8
7
.
3

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.
3
(Incode Table) contents after the operation : "A process has opened 3 fi les ? `xyz' for read
t+-
tf.)

--- Content provided by FirstRanker.com ---

0
only, `abc' for read write and `abc' again for write only". Discuss the same in detail.
-
(10 Marks)
a

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O ;
2
=-
o
Module-3

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5 a. Discuss how a C program is started and terminated in various ways along with suitable
diagram.
(10 Marks)
O b. Write a C program to avoid Zombie process by forking twice. (06 Marks)
t ?3

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OR
6 a.
What is the use of `setjmp' and `Iongjmp' function? Write a C program to illustrate the
same.
(08 Marks)

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b. What is Job control? List the 3 forms of support needed for Job control. (05 Marks)
c. Compare 'fork' and ?vfork' systemcall. (03 Marks)
1 of 2
Module-4
7 a. Define signal. Categorize the ways in which a process can handle the signals. (05 Marks)

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b. Discuss the working of `sigprocmask' API. Explain all the parameters in detail. (08 Marks)
c. Mention any 3 Daemon characteristics. (03 Marks)
OR
8 a. Write a C program that checks whether SIGINT signal is present in a process signal mask
and adds it to the mask if it is not there. It should clear SIGSEGV signal from the process

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signal mask. (08 Marks)
b. Discuss how error logging is done by a Daemon process with suitable diagram. (08 Marks)
Module-5
9 a. Define IPC. List the 1PC types supported in UNIX system. (05 Marks)
b. How to create a pipe in UNIX programming? List the limitations of pipe. (04 Marks)

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c. Develop a code snippet that the parent sends "Hello world" message to the child process
through the pipe. The child on receiving this message should display it on standard output.
(07 Marks)
OR
10 a. Illustrate how FIFO is useful in client server communication. (08 Marks)

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b. Define message queue. Discuss how it is useful in inter-process communication. (08 Marks)
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