[Openmcl-devel] Troubleshooting FFI calls on ARM

[Ron Garret]

On Jun 19, 2019, at 2:04 PM, Jeremy Shoemaker <jeremy at codingkoi.com> wrote:

> > One suggestion: use %get-signed-long to read out a few bytes of memory at the location reported by (external "getpid”) and then write a little C program that does the same thing and see if you get the same result.
> 
> I'm not sure I entirely follow, at least the C program part. Are you suggesting peeking at the memory pointed to by the `getpid` function in C?

Yes.  Exactly.

> I'm not quite sure how to do that, but my C is pretty rusty.

#include <unistd.h>
#include <stdio.h>

int main() {
  unsigned int *p = (unsigned int *)getpid;
  for (int i=0; i<16; i++) printf("%x ", *(p+i));
}

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