pg_config.c

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/*-------------------------------------------------------------------------
 *
 * pg_config.c
 *      Expose same output as pg_config except as an SRF
 *
 * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * IDENTIFICATION
 *    src/backend/utils/misc/pg_config.c
 *
 *-------------------------------------------------------------------------
 */
 
#include "postgres.h"
 
#include "catalog/pg_type.h"
#include "common/config_info.h"
#include "funcapi.h"
#include "miscadmin.h"
#include "port.h"
#include "utils/builtins.h"
 
Datum
pg_config(PG_FUNCTION_ARGS)
{
    ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
    ConfigData *configdata;
    size_t      configdata_len;
    int         i = 0;
 
    /* initialize our tuplestore */
    InitMaterializedSRF(fcinfo, 0);
 
    configdata = get_configdata(my_exec_path, &configdata_len);
    for (i = 0; i < configdata_len; i++)
    {
        Datum       values[2];
        bool        nulls[2];
 
        memset(values, 0, sizeof(values));
        memset(nulls, 0, sizeof(nulls));
 
        values[0] = CStringGetTextDatum(configdata[i].name);
        values[1] = CStringGetTextDatum(configdata[i].setting);
 
        tuplestore_putvalues(rsinfo->setResult, rsinfo->setDesc, values, nulls);
    }
 
    return (Datum) 0;
}