__init__.py 文件源码

def _send_signal(self, sig):
            if self.pid == 0:
                # see "man 2 kill"
                raise ValueError(
                    "preventing sending signal to process with PID 0 as it "
                    "would affect every process in the process group of the "
                    "calling process (os.getpid()) instead of PID 0")
            try:
                os.kill(self.pid, sig)
            except OSError as err:
                if err.errno == errno.ESRCH:
                    if OPENBSD and pid_exists(self.pid):
                        # We do this because os.kill() lies in case of
                        # zombie processes.
                        raise ZombieProcess(self.pid, self._name, self._ppid)
                    else:
                        self._gone = True
                        raise NoSuchProcess(self.pid, self._name)
                if err.errno in (errno.EPERM, errno.EACCES):
                    raise AccessDenied(self.pid, self._name)
                raise