Thread: Infinate loops/Battery consumption

Hi there. I'm trying to understand how i can make the code below more efficient. I'm trying find a way to execute the get_uptime() function every second. The code works but because of the infinite loop the CPU resources are at 100%. I'm trying to practice making an application for my phone (N900). I'm aware that the code below will drain the battery very quickly.

Any hints please?

Cheers

Code:

#include<stdio.h>
#include<sys/time.h>
#include<signal.h> 

void get_uptime(int signo)
{
	FILE *fd;
	float buf;
	fd = fopen("/proc/uptime","r");
	fscanf(fd,"%f",&buf);
	printf("%f\n",buf);
	fclose(fd);
}

int main(void)
{

	struct timeval delay;
	int ret;

	delay.tv_sec = 1;
	delay.tv_usec = 0;
		
	for(;;){

		select(1,NULL,NULL,NULL,&delay);
		get_uptime(0);
	}

return 0;
}

Try sleep()'ing for one second instead of timing out using select().