Hi, Adam! On Sep 03, Adam Scott wrote:

Is it possible to have mysql client protocol return the OS username and allow the protocol to backward compatible?

Looking to see if reasonable to provide same functionality as Oracle does with

select sys_context( 'userenv', 'os_user' ) from dual;

Yes, and there is no need to change the protocol. Since 10.0 it supports arbitrary "connection attributes". You need to modify your clients (or libmysqlclient, if you prefer that) to send the OS username, like this: mysql_options4(&mysql, MYSQL_OPT_CONNECT_ATTR_ADD, "os_user", "serg"); (but with geteuid(), etc instead of hard-coded name), and then you can do MariaDB [test]> select * from performance_schema.session_connect_attrs; +----------------+-----------------+------------+------------------+ | PROCESSLIST_ID | ATTR_NAME | ATTR_VALUE | ORDINAL_POSITION | +----------------+-----------------+------------+------------------+ | 2 | _os | Linux | 0 | | 2 | _client_name | libmysql | 1 | | 2 | _pid | 2387 | 2 | | 2 | _client_version | 10.0.14 | 3 | | 2 | _platform | x86_64 | 4 | | 2 | program_name | mysql | 5 | | 2 | os_user | serg | 6 | +----------------+-----------------+------------+------------------+ 7 rows in set (0.01 sec) Regards, Sergei