p2.c

main(int argc, char* argv[])
{
  
	//	Wire up the timer
	long time = elapsedTime(0);
	
	/*	Generate a random number between MINFORKS and MAXFORKS
	 */
	unsigned int seed = generateSeed(0);
	int n = rand_r(&seed) % MAXFORKS + MINFORKS;
	
	/*	Log next step
	 */
	time = elapsedTime(1);
	printf("%li: Number of forks = %i\n", time, n);
	
	/*	Hang on to the PIDs so we can wait for them after forking
	 */
	int *PIDs = (pid_t *)(malloc(sizeof(*PIDs)*n));
	
	/*	Fork n times
	 */
	for (int i = 0; i < n ; i++)
	{
		/*	Call fork() and retain the returned identifier
		 */
		pid_t processIdentifier = fork();

		/* Randomize the child sleep time
		 */
		seed = generateSeed(0);
		int minP = MINPAUSE;
		int sleeptime = rand_r(&seed)  % MAXPAUSE + MINPAUSE;
		
		if (min) {
			<#statements#>
		}
		
		/*	Check for errors
		 */
		if (processIdentifier == -1) {
			printf("Error: %i", errno);
		}
		

		if (!processIdentifier)
		{
			/*	We're in the child process,
			 *	sleep and then exit with
			 *	i as the error code.
			 */

			usleep(sleeptime);
			_exit(i);
		}
		else
		{
			/*	We're in the parent:
			 *	Store the PID and
			 *  print out the results.
			 */
			
			PIDs[i] = processIdentifier;
			
			time = elapsedTime(1);
			printf("%li: Child %i, pid = %i, forked, waits %i usec\n", time,  i, processIdentifier, sleeptime);
	
		}
	}
	
	/*
	 *  Loop through the processes and wait for them
	 *	to terminate. Then print the childid, and the
	 *	the pid.
	 */
	
	int status = NULL;
	
	for (int i = 0; i < n; i++)
	{
		
		/*	Wait for the child process
		 *  and grab it's status info
		 */
		 status = NULL;

		/*	Wait for the first process 
		 *	that terminates to do so.
		 */
		
		waitpid(-1, &status, 0);
		
		int childid = -1;
		if(WIFEXITED(status))
		{
			childid = WEXITSTATUS(status);
		
			/*	Log the results
			 */
			time = elapsedTime(1);
			printf("%li: Child %i, pid = %i, terminated\n", time, childid, PIDs[childid]);
		}
	}
	
	/* Release our PID array
	 */
	
	free(PIDs);
	
	/*	All done!
	 */
	time = elapsedTime(1);
	printf("All done. It only took %li milliseconds!", time);
	
}