Classical

Unix - System Calls

6:  

Which of the following remarks about system calls, library functions and UNIX commands are true?

A.

System call is a part of kernel, while the other two are not a part of kernel

B.

Unlike library functions. system calls and Unix commands are stand-alone programs

C.

Library functions and UNIX commands use system calls

D.

Unlike system calls, library functions and UNIX commands are stand-alone programs

 
 

Option: C

Explanation :


7:  

A fork system call will fail. if

A.

The previously executed statement is also a fork call

B.

The limit on the maximum number of processes in the system would be exceeded.

C.

The limit on the maximum number of processes that can be under execution by a single user would be exceeded.

D.

Both (b) & (c)

 
 

Option: D

Explanation :


8:  

Which of the following is used to write disk block images from memory to disk?

A.

clri

B.

sync

C.

rnkfs

D.

stty

 
 

Option: B

Explanation :


9:  

The PID of the kernel process is

A.

undefined

B.

0

C.

1

D.

3

 
 

Option: B

Explanation :




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Syllabus covered in this section is-

  • The UNIX System: File system, process management.
  •  Bourne shell, shell variables, command line programming
  •  Filters and Commands: Pr. Head, tail, cut. Paste. Sort. uniq, tr, join, etc, grep, egrep, fgrep, etc, sed, awk, etc.
  • System Calls (like) : Create, open. Close, read, write, iseek, link, unlink, stat, fstat, umask, chmod, exec, fork, wait, system.
  • Unix :Operating System
  •  Structure of Unix Operating System
  • UNIX Commands. Interfacing with Unix
  •  Editors and Compilers for Unix LEX  and YACC
  •  File system, System calls.
  • Filters, Shell programming

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