Question

I have several questions. Any input is appreciated. Thank you.

• Do C++ classes survive forking?
• If so, how it is implemented?
• What happens to pointers? Entire free store/heap is replicated and all virtual addresses are preserved?
• What happens to file streams?

Answer 1

Here’s my understanding:

• Do C++ classes survive forking?

yes.

• If so, how it is implemented?

All of memory is copied so you have no trouble there.

• What happens to pointers? Entire free store/heap is replicated and all virtual addresses are preserved?

yes.

• What happens to file streams?

Both processes retain a copy of all open filestreams. (by default there are some fork options that can change this I think.)
Streams opened after fork are not shared.