/proc/self/root/proc/self/root/usr/lib64/python3.9/multiprocessing
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import osimport signal from . import util __all__ = ['Popen'] ## Start child process using fork# class Popen(object): method = 'fork' def __init__(self, process_obj): util._flush_std_streams() self.returncode = None self.finalizer = None self._launch(process_obj) def duplicate_for_child(self, fd): return fd def poll(self, flag=os.WNOHANG): if self.returncode is None: try: pid, sts = os.waitpid(self.pid, flag) except OSError: # Child process not yet created. See #1731717 # e.errno == errno.ECHILD == 10 return None if pid == self.pid: self.returncode = os.waitstatus_to_exitcode(sts) return self.returncode def wait(self, timeout=None): if self.returncode is None: if timeout is not None: from multiprocessing.connection import wait if not wait([self.sentinel], timeout): return None # This shouldn't block if wait() returned successfully. return self.poll(os.WNOHANG if timeout == 0.0 else 0) return self.returncode def _send_signal(self, sig): if self.returncode is None: try: os.kill(self.pid, sig) except ProcessLookupError: pass except OSError: if self.wait(timeout=0.1) is None: raise def terminate(self): self._send_signal(signal.SIGTERM) def kill(self): self._send_signal(signal.SIGKILL) def _launch(self, process_obj): code = 1 parent_r, child_w = os.pipe() child_r, parent_w = os.pipe() self.pid = os.fork() if self.pid == 0: try: os.close(parent_r) os.close(parent_w) code = process_obj._bootstrap(parent_sentinel=child_r) finally: os._exit(code) else: os.close(child_w) os.close(child_r) self.finalizer = util.Finalize(self, util.close_fds, (parent_r, parent_w,)) self.sentinel = parent_r def close(self): if self.finalizer is not None: self.finalizer()