text: /**
   * @file
   * @brief CGI script to show current time/date
   *
   * @date 29.01.2021
   * @author Alexander Kalmuk
   */
  #include <stdio.h>
  #include <unistd.h>
  #include <string.h>
  
  int main(int argc, char *argv[]) {
  	char buf[128];
  	char *pbuf;
  	struct timeval tv;
  	time_t time;
  
  	printf(
  		"HTTP/1.1 200 OK\r\n"
  		"Content-Type: text/event-stream\r\n"
  		"Cache-Control: no-cache\r\n"
  		"Connection: keep-alive\r\n"
  		"\r\n"
  	);
  
  	while (1) {
  		pbuf = buf;
  
  		pbuf += sprintf(pbuf, "data: {\"time\" : \"");
  
  		gettimeofday(&tv, NULL);
  		time = tv.tv_sec;
  		ctime_r(&time, pbuf);
  
  		strcat(pbuf, "\"}\n\n");
  
  		if (0 > printf("%s", buf)) {
  			break;
  		}
  
  		sleep(1);
  	}
  
  	return 0;
  }
  