diff options
Diffstat (limited to 'sql/sql_parse.cc')
| -rw-r--r-- | sql/sql_parse.cc | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/sql/sql_parse.cc b/sql/sql_parse.cc index a09f3d28a0f..99a8a248d24 100644 --- a/sql/sql_parse.cc +++ b/sql/sql_parse.cc @@ -1232,10 +1232,34 @@ bool do_command(THD *thd) command_name[command])); } net->read_timeout=old_timeout; // restore it + /* + packet_length contains length of data, as it was stored in packet + header. In case of malformed header, packet_length can be zero. + If packet_length is not zero, my_net_read ensures that this number + of bytes was actually read from network. Additionally my_net_read + sets packet[packet_length]= 0 (thus if packet_length == 0, + command == packet[0] == COM_SLEEP). + In dispatch_command packet[packet_length] points beyond the end of packet. + */ DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length)); } #endif /* EMBEDDED_LIBRARY */ +/* + Perform one connection-level (COM_XXXX) command. + SYNOPSIS + dispatch_command() + thd connection handle + command type of command to perform + packet data for the command, packet is always null-terminated + packet_length length of packet + 1 (to show that data is + null-terminated) except for COM_SLEEP, where it + can be zero. + RETURN VALUE + 0 ok + 1 request of thread shutdown, i. e. if command is + COM_QUIT/COM_SHUTDOWN +*/ bool dispatch_command(enum enum_server_command command, THD *thd, char* packet, uint packet_length) |