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Expose control file data via SQL accessible functions.

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Add four new SQL accessible functions: pg_control_system(),
pg_control_checkpoint(), pg_control_recovery(), and pg_control_init()
which expose a subset of the control file data.

Along the way move the code to read and validate the control file to
src/common, where it can be shared by the new backend functions
and the original pg_controldata frontend program.

Patch by me, significant input, testing, and review by Michael Paquier.
This commit is contained in:
Joe Conway
2016-03-05 11:10:19 -08:00
parent d34794f7d5
commit dc7d70ea05
11 changed files with 900 additions and 105 deletions
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6
src/include/utils/builtins.h
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@@ -1151,6 +1151,12 @@ extern Datum show_all_file_settings(PG_FUNCTION_ARGS);
/* pg_config.c */
extern Datum pg_config(PG_FUNCTION_ARGS);
/* pg_controldata.c */
extern Datum pg_control_checkpoint(PG_FUNCTION_ARGS);
extern Datum pg_control_system(PG_FUNCTION_ARGS);
extern Datum pg_control_init(PG_FUNCTION_ARGS);
extern Datum pg_control_recovery(PG_FUNCTION_ARGS);
/* rls.c */
extern Datum row_security_active(PG_FUNCTION_ARGS);
extern Datum row_security_active_name(PG_FUNCTION_ARGS);