I already can debug general postgres using "ddd" and "select pg_backend_pid();" , now, I want to study the details of the system catalog cache and system cache management, so I need to debug the function InitPostgres() and InitCatalogCache(), and I tried the following steps:
and set a breakpoint on the next executable line after “PG_CMD_OPEN” in function bootstrap_template1() ,
Then within gdb, use “r $myfolder/mydb”,
and found the cursor stop at the breakpoint
(2) in the second terminal:
ps aux | grep "bin\/postgres"
after get the posgtres server pid, start a new ddd without args, and within gdb, using "attach postgres.pid"
and set a breakpoint as InitCatalogCache()
(3) back to the first ddd window, hit the "cont" button. I hope it can stop at the second ddd's breakpoint, but nothing happened?
I must make mistake in some step, or my understanding is fully wrong, please give me some advice, thanks a lot
I am sorry that this is a simple question. I found that the above steps make the posgres reach boot_yyparse() of BootstrapModeMain(void), which means postgres has already finished the initialization including InitCatalogCache(), and it was waiting query command or other user command .
For debug initialization including system catalog cache, I add some code like: