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

#define N_PROCS 42

int main(int argc, char *argv[])
{
    int i;
    pid_t child;
    int status;
    for (i = 0; i < N_PROCS; i++)
    {
        child = fork();
        if (-1 == child)
        {
            fprintf(stderr, "fork() failed\n");
            return 1;
        }
        /*
         * The next iteration of the loop will only be executed
         * by the child process.
         */
        if (child) break;
    }
    printf("I'm process #%d (PID=%d)\n", i, (long)getpid());
    /*
     * On the last iteration of the while loop, child is zero
     * for the last process in the chain.
     */
    if (child) wait(&status);
    return 0;
}