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Edit File : popen_fork.py \| Size : 2.27 KB
import os import sys import signal from . import util __all__ = ['Popen'] # # Start child process using fork # class Popen(object): method = 'fork' def __init__(self, process_obj): sys.stdout.flush() sys.stderr.flush() self.returncode = None self._launch(process_obj) def duplicate_for_child(self, fd): return fd def poll(self, flag=os.WNOHANG): if self.returncode is None: while True: try: pid, sts = os.waitpid(self.pid, flag) except OSError as e: # Child process not yet created. See #1731717 # e.errno == errno.ECHILD == 10 return None else: break if pid == self.pid: if os.WIFSIGNALED(sts): self.returncode = -os.WTERMSIG(sts) else: assert os.WIFEXITED(sts) self.returncode = os.WEXITSTATUS(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 terminate(self): if self.returncode is None: try: os.kill(self.pid, signal.SIGTERM) except ProcessLookupError: pass except OSError: if self.wait(timeout=0.1) is None: raise def _launch(self, process_obj): code = 1 parent_r, child_w = os.pipe() self.pid = os.fork() if self.pid == 0: try: os.close(parent_r) if 'random' in sys.modules: import random random.seed() code = process_obj._bootstrap() finally: os._exit(code) else: os.close(child_w) util.Finalize(self, os.close, (parent_r,)) self.sentinel = parent_r Back

Edit File : popen_fork.py | Size : 2.27 KB

import os
import sys
import signal

from . import util

__all__ = ['Popen']

#
# Start child process using fork
#

class Popen(object):
    method = 'fork'

def __init__(self, process_obj):
        sys.stdout.flush()
        sys.stderr.flush()
        self.returncode = None
        self._launch(process_obj)

def duplicate_for_child(self, fd):
        return fd

def poll(self, flag=os.WNOHANG):
        if self.returncode is None:
            while True:
                try:
                    pid, sts = os.waitpid(self.pid, flag)
                except OSError as e:
                    # Child process not yet created. See #1731717
                    # e.errno == errno.ECHILD == 10
                    return None
                else:
                    break
            if pid == self.pid:
                if os.WIFSIGNALED(sts):
                    self.returncode = -os.WTERMSIG(sts)
                else:
                    assert os.WIFEXITED(sts)
                    self.returncode = os.WEXITSTATUS(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 terminate(self):
        if self.returncode is None:
            try:
                os.kill(self.pid, signal.SIGTERM)
            except ProcessLookupError:
                pass
            except OSError:
                if self.wait(timeout=0.1) is None:
                    raise

def _launch(self, process_obj):
        code = 1
        parent_r, child_w = os.pipe()
        self.pid = os.fork()
        if self.pid == 0:
            try:
                os.close(parent_r)
                if 'random' in sys.modules:
                    import random
                    random.seed()
                code = process_obj._bootstrap()
            finally:
                os._exit(code)
        else:
            os.close(child_w)
            util.Finalize(self, os.close, (parent_r,))
            self.sentinel = parent_r

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