Find data positions of sparse file with SEEK_DATA & SEEK_HOLE, this does not work in Ubuntu 12.04.

sparsefile.c

#define _FILE_OFFSET_BITS 64

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

#ifndef SEEK_DATA
#warning "SEEK_DATA is undeclared and manually defined."
#define SEEK_DATA	3	/* seek to the next data */
#endif
#ifndef SEEK_HOLE
#warning "SEEK_HOLE is undeclared and manually defined."
#define SEEK_HOLE	4	/* seek to the next hole */
#endif

int main(int argc, char ** argv)
{
  if (argc != 2) {
    fprintf(stderr, "Usage: %s file\n", argv[0]);
  }
  int fd = open(argv[1], O_RDONLY);
  if(fd == -1) {
    perror("failed to open the file.");
    exit(EXIT_FAILURE);
  }
  off_t offset=0;
  struct stat status;
  fstat(fd, &status);
  const off_t size=status.st_size;
  do {
    off_t beg=lseek(fd, offset, SEEK_DATA);
    if(beg == -1) {
      perror("SEEK_DATA failed\n");
      exit(EXIT_FAILURE);
    }
    off_t end=lseek(fd, beg, SEEK_HOLE);
    if(end == -1) {
      perror("SEEK_HOLE failed\n");
      exit(EXIT_FAILURE);
    }
    lseek(fd, beg, SEEK_SET);
    fprintf(stderr, "0x%llx 0x%llx\n",
            (unsigned long long)beg,
            (unsigned long long)end);
    offset = end;
  } while (offset < size);
  return 0;
}

Thanks for the comment with the code! I honestly got lost all the context around my snippet and even not sure how to test it though. At least I can say yours looks cleaner and better :-)