fork() in C | what is use of fork() function in C language ? | ISRO - CSE 2018 Question

Fork used to create new process which is called child process. Child process runs concurrently with its Parent process. After a new child process created, both processes will execute the next instruction following the fork() system call. A child process use same pc(program counter), same CPU registers, same open files which use in parent process.

Below is Example:

#include<stdio.h>

#include<sys/types.h>

#include<unistd.h>

int main() {

    // make two process which run same

    // program after this instruction

    fork();

    printf("Hello world!\n");

    return 0;

}

Output :

Hello world!

Hello world!

Please see below link for more :

https://www.geeksforgeeks.org/fork-system-call/