Method find_next_log

phx_percona/percona/sql/binlog.cc:3850–3889

Find the position in the log-index-file for the given log name. @param[out] linfo The filename will be stored here, along with the byte offset of the next filename in the index file. @param need_lock_index If true, LOCK_index will be acquired; otherwise it should already be held by the caller. @note - Before calling this function, one has to call find_log_pos() to set up 'linf

  @retval LOG_INFO_IO Got IO error while reading file
*/
int MYSQL_BIN_LOG::find_next_log(LOG_INFO* linfo, bool need_lock_index)
{
  int error= 0;
  uint length;
  char fname[FN_REFLEN];
  char *full_fname= linfo->log_file_name;

  if (need_lock_index)
    mysql_mutex_lock(&LOCK_index);
  else
    mysql_mutex_assert_owner(&LOCK_index);

  /* As the file is flushed, we can't get an error here */
  my_b_seek(&index_file, linfo->index_file_offset);

  linfo->index_file_start_offset= linfo->index_file_offset;
  if ((length=my_b_gets(&index_file, fname, FN_REFLEN)) <= 1)
  {
    error = !index_file.error ? LOG_INFO_EOF : LOG_INFO_IO;
    goto err;
  }

  if (fname[0] != 0)
  {
    if(normalize_binlog_name(full_fname, fname, is_relay_log))
    {
      error= LOG_INFO_EOF;
      goto err;
    }
    length= strlen(full_fname);
  }

  full_fname[length-1]= 0;                     // kill \n
  linfo->index_file_offset= my_b_tell(&index_file);

err:
  if (need_lock_index)
    mysql_mutex_unlock(&LOCK_index);
  return error;
}


/**