Test lseek64

bigfile.cpp

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#include <iostream>

int main(int argc, char *argv[]) {
  if (argc != 2) {
    std::cout << "No input file given!\n";
    return 1;
  }
  int fd = open(argv[1], O_RDONLY);
  uint64_t file_size = lseek64(fd, 0, SEEK_END);
  close(fd);

  std::cout << "File size: " << file_size << "\n";

  return 0;
}

Makefile

bigfile: bigfile.cpp