mirror of https://github.com/python/cpython
88 lines
2.4 KiB
Python
88 lines
2.4 KiB
Python
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import os
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import sys
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import signal
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import errno
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from . import util
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__all__ = ['Popen']
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#
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# Start child process using fork
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#
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class Popen(object):
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method = 'fork'
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def __init__(self, process_obj):
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sys.stdout.flush()
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sys.stderr.flush()
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self.returncode = None
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self._launch(process_obj)
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def duplicate_for_child(self, fd):
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return fd
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def poll(self, flag=os.WNOHANG):
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if self.returncode is None:
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while True:
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try:
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pid, sts = os.waitpid(self.pid, flag)
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except OSError as e:
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if e.errno == errno.EINTR:
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continue
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# Child process not yet created. See #1731717
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# e.errno == errno.ECHILD == 10
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return None
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else:
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break
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if pid == self.pid:
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if os.WIFSIGNALED(sts):
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self.returncode = -os.WTERMSIG(sts)
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else:
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assert os.WIFEXITED(sts)
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self.returncode = os.WEXITSTATUS(sts)
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return self.returncode
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def wait(self, timeout=None):
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if self.returncode is None:
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if timeout is not None:
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from .connection import wait
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if not wait([self.sentinel], timeout):
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return None
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# This shouldn't block if wait() returned successfully.
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return self.poll(os.WNOHANG if timeout == 0.0 else 0)
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return self.returncode
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def terminate(self):
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if self.returncode is None:
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try:
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os.kill(self.pid, signal.SIGTERM)
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except ProcessLookupError:
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pass
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except OSError:
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if self.wait(timeout=0.1) is None:
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raise
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def _launch(self, process_obj):
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code = 1
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parent_r, child_w = util.pipe()
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self.pid = os.fork()
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if self.pid == 0:
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try:
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os.close(parent_r)
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if 'random' in sys.modules:
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import random
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random.seed()
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code = process_obj._bootstrap()
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finally:
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os._exit(code)
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else:
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os.close(child_w)
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util.Finalize(self, os.close, (parent_r,))
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self.sentinel = parent_r
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@staticmethod
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def ensure_helpers_running():
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pass
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