int main(int argc, char** argv) {
  int i;
  for (i = 0; i < 1000; ++i) {
    FILE *fp = fopen(argv[1], "rce");
    while (! feof_unlocked (fp)) {
      char line[1024];
      fgets(line, sizeof(line), fp);
    }
    fclose(fp);
  }

  return 0;
}


$ g++ -o test test.c -O2 -lpthread
$ time ./test /proc/27181/maps

real    0m0.305s
user    0m0.032s
sys     0m0.273s