#include<stdio.h>
#include<string.h>
#include<fcntl.h>
#include<unistd.h>

int main(){
	char towrite[128];
	int log_fd = open("logfile", O_WRONLY | O_APPEND | O_CREAT, 0644);
	for(int i = 100; i < 300; i += 100){
		sprintf(towrite, "count = %d\n", i);
		write(log_fd, towrite, strlen(towrite));
		sleep(1);
	}
	close(log_fd);

	return 0;	
}