LCOV - code coverage report
Current view: top level - contrib/pageinspect - fsmfuncs.c (source / functions) Hit Total Coverage
Test: PostgreSQL 13devel Lines: 11 12 91.7 %
Date: 2019-11-13 22:07:24 Functions: 2 2 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /*-------------------------------------------------------------------------
       2             :  *
       3             :  * fsmfuncs.c
       4             :  *    Functions to investigate FSM pages
       5             :  *
       6             :  * These functions are restricted to superusers for the fear of introducing
       7             :  * security holes if the input checking isn't as water-tight as it should.
       8             :  * You'd need to be superuser to obtain a raw page image anyway, so
       9             :  * there's hardly any use case for using these without superuser-rights
      10             :  * anyway.
      11             :  *
      12             :  * Copyright (c) 2007-2019, PostgreSQL Global Development Group
      13             :  *
      14             :  * IDENTIFICATION
      15             :  *    contrib/pageinspect/fsmfuncs.c
      16             :  *
      17             :  *-------------------------------------------------------------------------
      18             :  */
      19             : 
      20             : #include "postgres.h"
      21             : 
      22             : #include "funcapi.h"
      23             : #include "lib/stringinfo.h"
      24             : #include "miscadmin.h"
      25             : #include "pageinspect.h"
      26             : #include "storage/fsm_internals.h"
      27             : #include "utils/builtins.h"
      28             : 
      29             : /*
      30             :  * Dumps the contents of a FSM page.
      31             :  */
      32           8 : PG_FUNCTION_INFO_V1(fsm_page_contents);
      33             : 
      34             : Datum
      35           2 : fsm_page_contents(PG_FUNCTION_ARGS)
      36             : {
      37           2 :     bytea      *raw_page = PG_GETARG_BYTEA_P(0);
      38             :     StringInfoData sinfo;
      39             :     FSMPage     fsmpage;
      40             :     int         i;
      41             : 
      42           2 :     if (!superuser())
      43           0 :         ereport(ERROR,
      44             :                 (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
      45             :                  (errmsg("must be superuser to use raw page functions"))));
      46             : 
      47           2 :     fsmpage = (FSMPage) PageGetContents(VARDATA(raw_page));
      48             : 
      49           2 :     initStringInfo(&sinfo);
      50             : 
      51       16330 :     for (i = 0; i < NodesPerPage; i++)
      52             :     {
      53       16328 :         if (fsmpage->fp_nodes[i] != 0)
      54          26 :             appendStringInfo(&sinfo, "%d: %d\n", i, fsmpage->fp_nodes[i]);
      55             :     }
      56           2 :     appendStringInfo(&sinfo, "fp_next_slot: %d\n", fsmpage->fp_next_slot);
      57             : 
      58           2 :     PG_RETURN_TEXT_P(cstring_to_text_with_len(sinfo.data, sinfo.len));
      59             : }

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