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Here is an excerpt from the os.kill implementation under Windows (in win32_kill(), posixmodule.c):
 if (sig == CTRL_C_EVENT || sig == CTRL_BREAK_EVENT) {
 if (GenerateConsoleCtrlEvent(sig, pid) == 0) {
 err = GetLastError();
 PyErr_SetFromWindowsErr(err);
 }
 else
 Py_RETURN_NONE;
 }
It seems there is a missing return in the first branch, when GenerateConsoleCtrlEvent() fails.