For CS162 lab 6

xclock.cpp

#include <iostream>
#include <cstdio>
#include <ctime>
#include <unistd.h>

using namespace std;

char buffer[26];
int main() {
	int child = fork();
	if (child < 0) {
		printf("Error occured :(\n");
		return 1;
	} else if (child) {
		if (execl("/usr/bin/xclock", "myXclock", NULL) != 0) {
			printf("Xclock failed.");
			return 2;
		}
	}
	else { // parent
		for (int pdate = 1;; ++pdate) {
			time_t now = time(NULL);
			strftime(buffer, 26, "[%Y-%m-%d] %H:%M:%S", localtime(&now));
			printf("%s\n", buffer);
			if (pdate % 3 == 0)
				printf("\"This program has gone on for far too long. Type Ctrl+C to abort this silly application.\"\n");
			sleep(10);
		}
	}
	return 0;
}