[erlang-questions] Erlang C NIF access to process struct

Boshan Sun sunboshan@REDACTED
Sun Nov 5 04:39:58 CET 2017

Hi all,

In Erlang, you can use `hipe_bifs:show_heap(self()).` to debug the
process's heap.

From: 0x000000001ee5c6e0 to 0x000000001ee5c748
 |         H E A P         |
 |            Address |           Contents |
4 | 0x000000001ee5c6e0 | 0x000000000000004f |
[] | 0x000000001ee5c6e8 | 0xfffffffffffffffb |
3 | 0x000000001ee5c6f0 | 0x000000000000003f |
[4] | 0x000000001ee5c6f8 | 0x000000001ee5c6e1 |

However the implementation is for 32-bits machine, and the table is kind of
off for a 64-bits erlang.

I want to write a C NIF to print similar heap information. What I need is
the address of `process -> heap` and the heap size so I can get the heap's

My question is, is there a way to get a pointer to the given process via
pid in C NIF?

In NIF doc there's enif_get_local_pid
<http://erlang.org/doc/man/erl_nif.html#enif_get_local_pid> , how does this
pid translate to the process pointer?


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