malloc problem in porting HPUX 10.20 code on HPUX 11.11

[Suhas_3]

Hi all,

I have a problem in porting my HPUX 10.20 application (c code) to HPUX
11.11. Whenever there is calloc or realloc function, the application
coredumps and aborts.
I have to compile the programs using +DD64 option, as the application
uses informix objects which come pre-compiled using +DD64 option. I have
simulated the condition in one small program given below, which works on
10.20 and works on 11.11 if compiled without +DD64 option. But does not
work if compiled on 11.11 with +DD64 option.

Thanks for the help,
Suhas

cc -Aa +DD64

#define ALLOC(PTR) PTR=(struct ob *) calloc(2,sizeof(struct ob));

struct ob{
int nitin;
char kicha;
};
#include
main(){
int * ptr;
int a[16]={1,2,3,4,5,6,7,8,9,0,1,2,3,4};
struct ob *ob1;
ALLOC(ob1)
ptr=a;
ob1->nitin=10;
ob1->kicha='c';
printf("%d,%c",ob1->nitin,ob1->kicha);
}

[harry d brown jr]

You need to ADD

#include

live free or die
harry

[David Johns · Accepted solution]

Hi Suhas:

If you #include above the macro the program runs fine. I think the calloc function needs a prototype, or the compiler assumes it returns a 4 byte integer instead of an 8 byte pointer to void. The address after the cast to (struct ob *) is not in the process space and gives a memory access fault.

Cheers,
Dave

[A. Clay Stephenson]

The answer to this is that your code (even on 10.20) was working by accident. If you had added stdlib.h to your #includes, all would have been well.

As has already been indicated, the fundamental problem is that without a prototype, functions are assumed to be int. In the 32-bit world or the +DA32 model int and *ptr are the same size but in the +DD64 model int is 4 bytes and *ptr is 8 bytes.