Yes, I think that is correct.
I don't understand why detaching a child process on Linux/Unix would
make IPC stop working. Can somebody explain?
It is implemented with shared memory. I think (although I'm not 100%
sure) that shared memory is created *and freed up* (shm_unlink()
system call) by the parent process. It makes sense, because the child
processes will surely die with the parent. If you detach a child
process, then it won't be killed with its original parent. But the
shared memory will be freed by the original parent process anyway. I
suspect that the child that has mapped that shared memory segment will
try to access a freed up resource, do a segfault or something similar.
So detaching the child process will not make IPC stop working. But
exiting from the original parent process will. (And why else would you
detach the child?)
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