// gcc -O3 powercap.c -o powercap

#include <stdlib.h>
#include <stdio.h>

void read_energy(char *path) {
	FILE *fd = fopen(path, "r");
	if(fd) {
		char buf[32];
		int len = fread(buf, 1, 31, fd);
		fclose(fd);
		buf[len] = 0;
		printf("%s", buf);
	} else {
		printf("-1\n");
	}
}

int main() {
	read_energy("/sys/class/powercap/intel-rapl/subsystem/intel-rapl:0:0/energy_uj");
	read_energy("/sys/class/powercap/intel-rapl/subsystem/intel-rapl:0:1/energy_uj");
	read_energy("/sys/class/powercap/intel-rapl/subsystem/intel-rapl:0:2/energy_uj");
	return 0;
}