#include

#include

#include

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

{

pid_t childpid = 0;

int i, nbrOfProcesses;

if (argc != 2)

{

/* Check for valid number of command-line arguments */

fprintf(stderr, "Usage: %s ", argv[0]);

return 1;

}

/* Convert character string to integer */

nbrOfProcesses = atoi(argv[1]);

for (i = 1; i < nbrOfProcesses; i++)

{

childpid = fork();

if (childpid == -1)

{

printf("Fork failed");

exit(1);

}

else if (childpid != 0) // True for a parent

break;

} // End for

// Each parent prints this line

fprintf(stderr, "i: %d process ID: %4ld parent ID: %4ld

child ID: %4ld ", i, (long)getpid(), (long)getppid(),

(long)childpid);

sleep(5); // Sleep five seconds

return 0;

} // End main

Explain the relationship between the created processes.