SHELL

fork() system call in linux

#include<stdio.h>
#include<stdlib.h>

int main()
{
    printf("
BeforeForking
"); 
    fork();
    printf("
After Forking
");
    return 0;
}

fork system call

#include <stdio.h>
#include <unistd.h>

int main()
{
	fork();
	fork();
	fork();
	puts("Hi");
	return 0;
}

// Output:
// Hi
// Hi
// Hi
// Hi
// Hi
// Hi
// Hi
// Hi

fork system call

System call fork() is used to create processes. It takes no arguments and 
returns a process ID.
The purpose of fork() is to create a new process, which becomes the child 
process of the caller.
After a new child process is created, both processes will execute 
the next instruction following the fork() system call.

fork system call

#include <stdio.h>
#include <unistd.h>

int main()
{
	fork();
	puts("Hi");
	return 0;
}

// Output:
// Hi
// Hi

fork system call

#include <stdio.h>
#include <unistd.h>

int main()
{
	fork();
	fork();
	puts("Hi");
	return 0;
}

// Output:
// Hi
// Hi
// Hi
// Hi