**
** dev_inode(FILENAME) returns a string.  If FILENAME exists and is
** a regular file, then the return string is of the form:
**
**       DEV/INODE
**
** Where DEV and INODE are the device number and inode number for
** the file.  Or, on Windows, the return value is the canonical
** name of the file, because Windows does not have INODEs.
** the file.  On Windows, the volume serial number (DEV) and file
** identifier (INODE) are used to compute the value, see comments
** on the win32_file_id() function.
**
** If FILENAME does not exist, then the return is an empty string.
**
** The value of inode() can be used to eliminate files from a list
** that have duplicates because they have differing names due to links.
**
** Code that wants to use this SQL function needs to first register

  zFilename = (const char*)sqlite3_value_text(argv[0]);
  if( zFilename==0 || zFilename[0]==0 || file_access(zFilename,F_OK) ){
    sqlite3_result_text(context, "", 0, SQLITE_STATIC);
    return;
  }
#if defined(_WIN32)
  {
    const char *zCanonical = file_canonical_name_dup(zFilename);
    sqlite3_result_text(context, zCanonical, -1, fossil_free);
    char *zFileId = win32_file_id(zFilename);
    if( zFileId ){
      sqlite3_result_text(context, zFileId, -1, fossil_free);
    }else{
      sqlite3_result_text(context, "", 0, SQLITE_STATIC);
    }
  }
#else
  {
    struct stat buf;
    int rc;
    memset(&buf, 0, sizeof(buf));
    rc = stat(zFilename, &buf);