Re: large struct cause segmentation fault

Aloha wrote:
Hi, everybody:

I am puzzled by the segmentation fault caused by a large struct
malloced in my program, see below the actual code, the program will
cause segmentation fault when I try to acess bb->xyz[20[1000], I am
running on solaris 2.8 using gcc 2.8.1, and other than the stack size
is limited to 8M, all other resources such as virtural memory are
unlimited, my physical memory is 256M, my virtual memory is more than
1G.
So, what is wrong?

Works fine on my Solaris laptop with Sun Studio.

Regards

/* code begins */

#include <stdio.h>

missing <stdlib.h>

typedef struct abc {
char efg[128][1024*1024];
char ijk[128][1024*1024];
char xyz[128][1024*1024];
} ABC;


main()
int main()
{
ABC *bb = 0;

bb = (ABC *)malloc(sizeof(ABC));

printf("access head of ABC\n");

bb->ijk[0][0] = 0; /* this is ok */

printf("acces head ok.\n");

printf("access tail of ABC\n");

bb->xyz[20][1000] = 0; /*crash here */

printf("acces tail ok.\n");

}
/* code ends */

Isn't that rather obvious?

--
Ian Collins.
.

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