Re: SPI_getvalue fails - Mailing list pgsql-interfaces

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;//13char *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@staff.ownmail.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@staff.ownmail.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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