This code is to create process in Linux and trace the flow

forktest.c

#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<sys/wait.h>
#include<unistd.h>


int main(int argc, char *argv[]){

   printf("1.Process PID: %d\n", (int)getpid());
   pid_t pid = fork();
   printf("2.fork returned: %d\n", (int)pid);

   if(pid == 0){
        printf("3.Process PID: %d\n", (int)getpid());
        pid_t pid1 = fork();
        printf("4.fork returned: %d\n", (int)pid1);

        if (pid1 == 0){
              printf("5.Process exiting with PID: %d\n", (int)getpid());
              exit(0);
        }

        printf("6.Process waiting with PID: %d\n", (int)getpid());
        wait(NULL);
	printf("7.Process exiting with PID: %d\n", (int)getpid());
        
        exit(0);
   }

   printf("8.Process waiting with PID: %d\n", (int)getpid());
   wait(NULL);
   printf("9.Process exiting with PID: %d\n", (int)getpid());

   return 0;
}