| 1 | n/a | import os |
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| 2 | n/a | import sys |
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| 3 | n/a | import signal |
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| 4 | n/a | |
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| 5 | n/a | from . import util |
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| 6 | n/a | |
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| 7 | n/a | __all__ = ['Popen'] |
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| 8 | n/a | |
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| 9 | n/a | # |
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| 10 | n/a | # Start child process using fork |
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| 11 | n/a | # |
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| 12 | n/a | |
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| 13 | n/a | class Popen(object): |
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| 14 | n/a | method = 'fork' |
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| 15 | n/a | |
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| 16 | n/a | def __init__(self, process_obj): |
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| 17 | n/a | sys.stdout.flush() |
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| 18 | n/a | sys.stderr.flush() |
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| 19 | n/a | self.returncode = None |
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| 20 | n/a | self._launch(process_obj) |
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| 21 | n/a | |
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| 22 | n/a | def duplicate_for_child(self, fd): |
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| 23 | n/a | return fd |
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| 24 | n/a | |
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| 25 | n/a | def poll(self, flag=os.WNOHANG): |
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| 26 | n/a | if self.returncode is None: |
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| 27 | n/a | while True: |
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| 28 | n/a | try: |
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| 29 | n/a | pid, sts = os.waitpid(self.pid, flag) |
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| 30 | n/a | except OSError as e: |
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| 31 | n/a | # Child process not yet created. See #1731717 |
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| 32 | n/a | # e.errno == errno.ECHILD == 10 |
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| 33 | n/a | return None |
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| 34 | n/a | else: |
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| 35 | n/a | break |
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| 36 | n/a | if pid == self.pid: |
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| 37 | n/a | if os.WIFSIGNALED(sts): |
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| 38 | n/a | self.returncode = -os.WTERMSIG(sts) |
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| 39 | n/a | else: |
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| 40 | n/a | assert os.WIFEXITED(sts) |
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| 41 | n/a | self.returncode = os.WEXITSTATUS(sts) |
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| 42 | n/a | return self.returncode |
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| 43 | n/a | |
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| 44 | n/a | def wait(self, timeout=None): |
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| 45 | n/a | if self.returncode is None: |
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| 46 | n/a | if timeout is not None: |
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| 47 | n/a | from multiprocessing.connection import wait |
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| 48 | n/a | if not wait([self.sentinel], timeout): |
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| 49 | n/a | return None |
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| 50 | n/a | # This shouldn't block if wait() returned successfully. |
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| 51 | n/a | return self.poll(os.WNOHANG if timeout == 0.0 else 0) |
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| 52 | n/a | return self.returncode |
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| 53 | n/a | |
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| 54 | n/a | def terminate(self): |
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| 55 | n/a | if self.returncode is None: |
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| 56 | n/a | try: |
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| 57 | n/a | os.kill(self.pid, signal.SIGTERM) |
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| 58 | n/a | except ProcessLookupError: |
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| 59 | n/a | pass |
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| 60 | n/a | except OSError: |
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| 61 | n/a | if self.wait(timeout=0.1) is None: |
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| 62 | n/a | raise |
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| 63 | n/a | |
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| 64 | n/a | def _launch(self, process_obj): |
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| 65 | n/a | code = 1 |
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| 66 | n/a | parent_r, child_w = os.pipe() |
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| 67 | n/a | self.pid = os.fork() |
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| 68 | n/a | if self.pid == 0: |
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| 69 | n/a | try: |
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| 70 | n/a | os.close(parent_r) |
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| 71 | n/a | if 'random' in sys.modules: |
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| 72 | n/a | import random |
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| 73 | n/a | random.seed() |
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| 74 | n/a | code = process_obj._bootstrap() |
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| 75 | n/a | finally: |
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| 76 | n/a | os._exit(code) |
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| 77 | n/a | else: |
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| 78 | n/a | os.close(child_w) |
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| 79 | n/a | util.Finalize(self, os.close, (parent_r,)) |
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| 80 | n/a | self.sentinel = parent_r |
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