Re: [HACKERS] threads stuff/UnixWare

--On Thursday, May 13, 2004 21:26:50 -0400 Tom Lane <tgl@sss.pgh.pa.us>
wrote:

> Larry Rosenman <ler@lerctr.org> writes:
>> I ran a quick C test:
>
> Where does it leave the "ptr" pointing to?

$ cc -O -o test3 test3.c
$ ./test3
num=nan
errno=0
ptr=8049682, points to N
num=inf
errno=0
ptr=8049686, points to f
$ cat test3.c
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
int main(int argc,char **argv)
{
  double num;
  char *input="NaN";
  char *border1="/////////////////////////////";
  char *input2="inf";
  char *border2="/////////////////////////////";
  char **ptr;

  num=strtod(input,ptr);
  printf("num=%g\n",num);
  printf("errno=%ld\n",errno);
  printf("ptr=%p, points to %s\n",*ptr,*ptr);
  num=strtod(input2,ptr);
  printf("num=%g\n",num);
  printf("errno=%ld\n",errno);
  printf("ptr=%p, points to %s\n",*ptr,*ptr);
  exit(0);
}
$


>
>> So, how's the easiest way to trace PG's float4in stuff?
>
> gdb is my favorite ...

and (without installing it), how can I grab gdb on the gmake test
backend(s)?



--
Larry Rosenman                     http://www.lerctr.org/~ler
Phone: +1 972-414-9812                 E-Mail: ler@lerctr.org
US Mail: 1905 Steamboat Springs Drive, Garland, TX 75044-6749