Read the following program carefully and write the output
of the program. Explain each
line of code according to given numbering.
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
1……………… int main (void)
{
pid_t pid;
2………………………… pid = fork();
3…………………………. if (pid > 0)
{
int i;
4………………………… for (i = 0; i < 5; i++)
{
5………………… …………… printf(" I AM VU : %d\n", i);
6………………… …………… sleep(1);
}
exit(0);
}
7………………… ……… else if (pid == 0) {
int j;
for (j = 0; j < 5; j++)
{
8……………………………… printf(" I have no child: %d\n", j);
sleep(1);
}
_exit(0);
}
else
{
9………………………………fprintf(stderr, "can't fork, error %d\n",
errno);
10……………… … ………… exit (EXIT_FAILURE);
}
}
- 1 Answers
- 4324 Views
- I also Faced
- E-Mail Answers
Answer Posted / saith
1 int main (void) Starts the main function
2 pid = fork ( ); The fork ( ) method will call and store
the integer value in the pid variable. In case of Child “0”
value returned while the parent will store the “process id”
of the child. In case when fork fails it will be
initialized by -1
3 if (pid > 0) This condition will be only true when fork
failed.
4 for (i = 0; i < 5; i++) Limmitations of for loop are
declared and the loop starts
5 printf(" I AM VU : %d\n", i);
Prints I AM VU and the value of I message on screen
6 sleep(1); Process sleeps
7 else if (pid == 0) Now this blok of code executes in
parent process since fork returns the ID to the parent
process from child. which is not 0.
8 printf(" I have no child: %d\n", j);
“I have no child” is printed on the screen
9 fprintf(stderr, "can't fork, error %d\n", errno);
If the given conditions are not true then this error
message is send
10 exit (EXIT_FAILURE); system call will terminate the
process abnormally as it fails.
| Is This Answer Correct ? | 4 Yes | 0 No |
Post New Answer View All Answers
What are compilers in c++?
Explain the properties and principles of oop.
Describe the setting up of my member functions to avoid overriding by the derived class?
Explain what are the sizes and ranges of the basic c++ data types?
What is a pointer how and when is it used?
How many types of classes are there in c++?
Are strings immutable in c++?
What are multiple inheritances (virtual inheritance)?
What are punctuators in c++?
Are vectors passed by reference c++?
What is extern c++?
Explain container class.
What function initalizes variables in a class: a) Destructor b) Constitutor c) Constructor
What is constructor in C++?
What is vectorial capacity?
