Use of Fork in Operating System C Program

Operating Systems Lab Manual / Use of Fork in Operating System C Program

Program Name: Write a C Program to demonstrate use of fork in operating system.

Theory

Fork is a system call used to create two processes. One parent process with process id non zero and 
one child process with process id zero.



Getpid : returns process ID of the calling process
Getppid() : returns the process ID of the parent of the calling process.

Program Code

#include<sys/types.h> 
#include<unistd.h> 
#include<stdio.h>
main()
{
pid_t pid; 
pid=fork(); 
if(pid==0)
printf("\nChild process");
else
printf("\nparent process Id:%d",getpid());
}

Input:

Output:
parent process Id:146

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