#include <unistd.h>				// required for fork()
#include <sys/wait.h>				// required for wait()
#include <stdio.h>				// required for perror()
#include <stdlib.h>				// required for exit()

int main(int argc, char *argv[])		// standard main() function
{
	int status = EXIT_SUCCESS;		// child process exit status
	pid_t pid = fork();			// fork child process

	switch (pid)				// check fork() return value
	{
		case -1:			// an error occurred
		    perror("fork");		// print an error message
		    status = EXIT_FAILURE;	// exit with failure status
		break;
		case 0:				// this is the child process
		    printf("child\n");		// execute child code
		break;
		default:			// parent, pid = child ID
		    printf("parent\n");		// execute parent code
		    wait(&status);		// wait for child to exit
	}
	return status;				// return the child status
}