#include <stdio.h>
int main()
{
int pid, i;
pid = fork();
switch(pid)
{
case -1: /* an error occurred */
printf("Fork error");
break;
case 0: /* this code is executed by the child process */
for(i=1; i<1000; i++)
printf("Child process, iteration: %d\n", i);
break;
default: /* this code is executed by the parent process */
for(i=1; i<1000; i++)
printf("Parent process, iteration: %d\n", i);
}
}