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

int main(int argc, char **argv) {
  FILE *f = fopen("/sys/power/state", "w");

  if(argc != 2) {
	fprintf(stderr, "%s [mem|standby|freeze|disk]\n", argv[0]);
	exit(1);
  }


  if(f == NULL) {
	fprintf(stderr, "%s is unable to write to /sys/power/state.\nAdd the setuid bit?\n", argv[0]);
	exit(1);
  }

  fprintf(f, "%s", argv[1]);

  fclose(f);
}