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

int main()
{
  FILE* fp;
  while(1) {
    fp = fopen("/proc/myled", "w");
    if(fp == NULL) {
      printf("Cannot open /proc/myled for write\n");
      return -1;
    }
    fputs("0x0F\n", fp);
    fclose(fp);
    sleep(1);
    fp = fopen("/proc/myled", "w");
    if(fp == NULL) {
      printf("Cannot open /proc/myled for write\n");
      return -1;
    }
    fputs("0x00\n", fp);
    fclose(fp);
    sleep(1);
  }
  return 0;
}