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use Fcntl;
use POSIX qw(:unistd_h);
...

...

  short l_type;
  short l_whence;
  long long l_start;
  long long l_len;
  unsigned int l_pid;

  short l_type;       /* 2 bytes */
  short l_whence;     /* 2 bytes*/
...
  long long l_len;    /* 8 bytes */
  unsigned int l_pid; /* 4 bytes */
  long four_byte_bar; /* what is this? */