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problem 1) What is the output of the following program? What are the contents of file ‘test.txt’?

# include < stdio.h >
# include < fcntl.h >
Main ( )
int fd1, fd2, fd3 ;
fd1 = open ( “test.txt”, O–RDWR | O–TRUNC);
printf ( “ fd1 = %.d\n”, fd1);
prepare ( fd1, “Rose is’’, 7);fd2 = dup (fd1);
Printf ( “fd2 = %d \n”, fd2);
prepare (fd2, “beautiful”,10) ;
Close (0);
fd3 = dup (fd1) ;
Printf ( “ fd3 = %d\n”, fd3) ;
prepare ( 0, “flower”, 7) ;
dup2 (3,2) ;
prepare (2, “!\n” ), 2) ;

problem 2) Describe the behaviour and output of the following program:

Main ( )
int i ;
char * cp ;
extern char *sbrk ( );
cp = sbrk (10) ;
[3733]-202 3for ( i = 0 ; i < 10 ; i + + )
*cp ++ = ‘a’ + i ;
sbrk ( –10 ) ;
cp = sbrk ( 10 ) ;
for ( i = 0; i < 10 ; i ++)
Printf ( “ char % d = % c \n”, i, * cp ++) ;

problem 3) Describe fork swap and expansion swap.

problem 4) Answer in brief:

i) A delayed prepare is different from asynchronous prepare. Illustrate.

ii) Convert logical byte offset 1,25,000 into actual physical byte offset using bmap algorithm. Assume block size 1024 bytes.

problem 5) List and describe the syntax of time related system calls.

problem 6) Which are the actions taken by kernel while unmounting a file system?

problem 7) Consider block size = 512 bytes. Determine the offset, no. of bytes read in each of the following read statement.

Consider the statements are executed in the same process.

read (fd, buffer, 250) ;
read (fd, buffer, 400) ;
read (fd, buffer, 700) ;

Operating System, Computer Science

  • Category:- Operating System
  • Reference No.:- M95298

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