Function initChain

flow/SignalSafeUnwind.cpp:33–42

                                    void* data) = nullptr;

static void initChain() {
	static std::once_flag flag;

	// Ensure that chain_dl_iterate_phdr points to the "real" function that we are overriding
	std::call_once(flag, []() { *(void**)&chain_dl_iterate_phdr = dlsym(RTLD_NEXT, "dl_iterate_phdr"); });

	if (!chain_dl_iterate_phdr) {
		criticalError(FDB_EXIT_ERROR, "SignalSafeUnwindError", "Unable to find dl_iterate_phdr symbol");
	}
}

// This overrides the function in libc!
extern "C" int dl_iterate_phdr(int (*callback)(struct dl_phdr_info* info, size_t size, void* data), void* data) {