Function dispatch_command

sql/sql_parse.cc:570–759

Perform one connection-level (COM_XXXX) command. @param command type of command to perform @param thd connection handle @param packet data for the command, packet is always null-terminated @param packet_length length of packet + 1 (to show that data is null-terminated) except for COM_SLEEP, where it can be ze

        COM_QUIT/COM_SHUTDOWN
*/
bool dispatch_command(enum enum_server_command command, THD *thd,
		      char* packet, uint packet_length)
{
  bool error= 0;
  DBUG_ENTER("dispatch_command");
  DBUG_PRINT("info",("packet: '%*.s'; command: %d", packet_length, packet, command));

  DBUG_EXECUTE_IF("crash_dispatch_command_before",
                  { DBUG_PRINT("crash_dispatch_command_before", ("now"));
                    DBUG_ABORT(); });

  /* DTRACE instrumentation, begin */
  MYSQL_COMMAND_START(thd->thread_id, command,
                      &thd->security_ctx->priv_user[0],
                      (char *) thd->security_ctx->host_or_ip);

  thd->set_command(command);

  thd->clear_slow_extended();
  thd->lex->sql_command= SQLCOM_END; /* to avoid confusing VIEW detectors */
  thd->set_time();
  if (!thd->is_valid_time())
  {
    /*
     If the time has got past 2038 we need to shut this server down
     We do this by making sure every command is a shutdown and we 
     have enough privileges to shut the server down

     TODO: remove this when we have full 64 bit my_time_t support
    */
    thd->security_ctx->master_access|= SHUTDOWN_ACL;
    command= COM_SHUTDOWN;
  }

  /**
    Clear the set of flags that are expected to be cleared at the
    beginning of each command.
  */
  thd->server_status&= ~SERVER_STATUS_CLEAR_SET;

  /**
    Enforce password expiration for all RPC commands, except the
    following:

    COM_QUERY does a more fine-grained check later.
    COM_STMT_CLOSE and COM_STMT_SEND_LONG_DATA don't return anything.
    COM_PING only discloses information that the server is running,
       and that's available through other means.
    COM_QUIT should work even for expired statements.
  */
  if (unlikely(thd->security_ctx->password_expired &&
               command != COM_QUERY &&
               command != COM_STMT_CLOSE &&
               command != COM_STMT_SEND_LONG_DATA &&
               command != COM_PING &&
               command != COM_QUIT))
  {
    my_error(ER_MUST_CHANGE_PASSWORD, MYF(0));