Re: SPI_getvalue fails

Here is the code:-

#include <stdio.h>
#include "postgres.h"
#include "executor/spi.h"
#include "commands/trigger.h"
#include <math.h>
#include <sys/time.h>
#include <time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <errno.h>
#include <stddef.h>
#include <dirent.h>

#include <fcntl.h>
#include <stdlib.h>
#include <string.h>

extern Datum trigast(PG_FUNCTION_ARGS);
extern char **environ;

int do_log(char *log)
{
FILE *fp=fopen("/home/vivek/logs/trig.log","a");
if (fp)
{
time_t t = time(NULL);
struct tm *c_date = localtime(&t);
char *t_now=strdup(asctime(c_date));
t_now[strlen(t_now)-1]=0;
fprintf(fp,"%s-trigfaxes-%s\n",t_now,log);
fclose(fp);
return 1;
}
return -1;
}


PG_FUNCTION_INFO_V1(trigast);
Datum
trigast(PG_FUNCTION_ARGS)
{
do_log("STARTING TRIGGER");
HeapTuple rettuple;
HeapTuple trigtuple;
TupleDesc tupdesc;
int ret, i;
bool isnull;
char *disposition; //13
char *when;
char logs[1024];

do_log(" Checking fcinfo");
if (CALLED_AS_TRIGGER(fcinfo)) {
TriggerData *trigdata = (TriggerData *) fcinfo->context;
SPI_connect();

do_log("GOT TRIGTUPLE");

rettuple = trigdata->tg_trigtuple;

char *relation=SPI_getrelname(trigdata->tg_relation);
sprintf(logs,"Relation is %s", relation);
do_log(logs);

trigtuple = trigdata->tg_trigtuple;
tupdesc = trigdata->tg_relation->rd_att;

if( tupdesc == NULL || trigtuple == NULL ){
do_log("tupdesc OR trigtuple == NULL" );
if( tupdesc == NULL )
do_log("tupdesc is NULL" );
if( trigtuple == NULL )
do_log( "trigtuple is NULL" );
}
else
do_log("tupdesc && trigtuple ARE NOT NULL" );


do_log("Starting to get values");

disposition=SPI_getvalue(trigtuple, tupdesc,13);
sprintf(logs, "value is %s", disposition);
do_log(logs); // doesnot reach here.

}
SPI_finish();
return PointerGetDatum(rettuple);

}

/*
logs are:-
Mon Jul 31 18:20:12 2006-trigfaxes-STARTING TRIGGER
Mon Jul 31 18:20:12 2006-trigfaxes- Checking fcinfo
Mon Jul 31 18:20:12 2006-trigfaxes-GOT TRIGTUPLE
Mon Jul 31 18:20:12 2006-trigfaxes-Relation is ast_cdr
Mon Jul 31 18:20:12 2006-trigfaxes-tupdesc OR trigtuple == NULL
Mon Jul 31 18:20:12 2006-trigfaxes-trigtuple is NULL
Mon Jul 31 18:20:12 2006-trigfaxes-Starting to get values
*/

/*
gdb shows:-
Program received signal SIGSEGV, Segmentation fault.
0x08121f46 in SPI_getvalue ()
(gdb) bt
#0 0x08121f46 in SPI_getvalue ()
*/

With warm regards.

Vivek J. Joshi.

vivek(at)staff(dot)ownmail(dot)com
Trikon electronics Pvt. Ltd.

All science is either physics or stamp collecting.
-- Ernest Rutherford

Michael Fuhr wrote:
> >On Mon, Jul 31, 2006 at 12:29:25PM +0530, vivek(at)staff(dot)ownmail(dot)com wrote:
>> I get a coredump if I try to use SPI_getvalue. Upon writing some
>> logs, I see that postgresql gets the insert statement properly
>> with all the values non null but the variable trigdata->tg_trigtuple
>> is NULL. I am not able to figure out why it happens so.
>
>The connection between trigdata->tg_trigtuple being NULL and
>SPI_getvalue() causing a core dump isn't clear from what you've
>written. It sounds like you're writing a C function that's called
>via a trigger -- is that correct? Could you post the CREATE TRIGGER
>statement and the function's code?
>
>--
>Michael Fuhr
>
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