Function open_table_def

sql/table.cc:662–791

*/

enum open_frm_error open_table_def(THD *thd, TABLE_SHARE *share, uint flags)
{
  bool error_given= false;
  File file;
  uchar *buf;
  uchar head[FRM_HEADER_SIZE];
  char	path[FN_REFLEN + 1];
  size_t frmlen, read_length;
  uint length;
  DBUG_ENTER("open_table_def");
  DBUG_PRINT("enter", ("table: '%s'.'%s'  path: '%s'", share->db.str,
                       share->table_name.str, share->normalized_path.str));

  share->error= OPEN_FRM_OPEN_ERROR;

  length=(uint) (strxnmov(path, sizeof(path) - 1,
                          share->normalized_path.str, reg_ext, NullS) - path);
  if (flags & GTS_FORCE_DISCOVERY)
  {
    const char *path2= share->normalized_path.str;
    DBUG_ASSERT(flags & GTS_TABLE);
    DBUG_ASSERT(flags & GTS_USE_DISCOVERY);
    /* Delete .frm and .par files */
    mysql_file_delete_with_symlink(key_file_frm, path2, reg_ext, MYF(0));
    mysql_file_delete_with_symlink(key_file_partition_ddl_log, path2, PAR_EXT,
                                   MYF(0));
    file= -1;
  }
  else
    file= mysql_file_open(key_file_frm, path, O_RDONLY | O_SHARE, MYF(0));

  if (file < 0)
  {
    if ((flags & GTS_TABLE) && (flags & GTS_USE_DISCOVERY))
    {
      ha_discover_table(thd, share);
      error_given= true;
    }
    goto err_not_open;
  }

  if (mysql_file_read(file, head, sizeof(head), MYF(MY_NABP)))
  {
    share->error = my_errno == HA_ERR_FILE_TOO_SHORT
                      ? OPEN_FRM_CORRUPTED : OPEN_FRM_READ_ERROR;
    goto err;
  }

  if (memcmp(head, STRING_WITH_LEN("TYPE=VIEW\n")) == 0)
  {
    share->is_view= 1;
    if (flags & GTS_VIEW)
    {
      LEX_CSTRING pathstr= { path, length };
      /*
        Create view file parser and hold it in TABLE_SHARE member
        view_def.
      */