#include "diskinfo.h"

int disk_io_kb(char* disk,
    unsigned long long* read,
    unsigned long long* write) {
  char syspath[512] = {'\0'};
  unsigned long long stats[8] = {-1};
  FILE* fd = NULL;

  sprintf(syspath, "/sys/block/%s/stat", disk);

  fd = fopen(syspath, "r");
  if(!fd)
    return -1;

  // read io   read merge   read sectors   read ticks
  // write io  write merge  write sectors  write ticks
  fscanf(fd, "%lld %lld %lld %lld %lld %lld %lld %lld ",
    &stats[0], &stats[1], &stats[2], &stats[3],
    &stats[4], &stats[5], &stats[6], &stats[7]);

  fclose(fd);

  *read = stats[2] / 2;
  *write = stats[6] / 2;

  return 1;
}