python (3.11.7)
1 import os
2 import signal
3
4 from . import util
5
6 __all__ = ['Popen']
7
8 #
9 # Start child process using fork
10 #
11
12 class ESC[4;38;5;81mPopen(ESC[4;38;5;149mobject):
13 method = 'fork'
14
15 def __init__(self, process_obj):
16 util._flush_std_streams()
17 self.returncode = None
18 self.finalizer = None
19 self._launch(process_obj)
20
21 def duplicate_for_child(self, fd):
22 return fd
23
24 def poll(self, flag=os.WNOHANG):
25 if self.returncode is None:
26 try:
27 pid, sts = os.waitpid(self.pid, flag)
28 except OSError:
29 # Child process not yet created. See #1731717
30 # e.errno == errno.ECHILD == 10
31 return None
32 if pid == self.pid:
33 self.returncode = os.waitstatus_to_exitcode(sts)
34 return self.returncode
35
36 def wait(self, timeout=None):
37 if self.returncode is None:
38 if timeout is not None:
39 from multiprocessing.connection import wait
40 if not wait([self.sentinel], timeout):
41 return None
42 # This shouldn't block if wait() returned successfully.
43 return self.poll(os.WNOHANG if timeout == 0.0 else 0)
44 return self.returncode
45
46 def _send_signal(self, sig):
47 if self.returncode is None:
48 try:
49 os.kill(self.pid, sig)
50 except ProcessLookupError:
51 pass
52 except OSError:
53 if self.wait(timeout=0.1) is None:
54 raise
55
56 def terminate(self):
57 self._send_signal(signal.SIGTERM)
58
59 def kill(self):
60 self._send_signal(signal.SIGKILL)
61
62 def _launch(self, process_obj):
63 code = 1
64 parent_r, child_w = os.pipe()
65 child_r, parent_w = os.pipe()
66 self.pid = os.fork()
67 if self.pid == 0:
68 try:
69 os.close(parent_r)
70 os.close(parent_w)
71 code = process_obj._bootstrap(parent_sentinel=child_r)
72 finally:
73 os._exit(code)
74 else:
75 os.close(child_w)
76 os.close(child_r)
77 self.finalizer = util.Finalize(self, util.close_fds,
78 (parent_r, parent_w,))
79 self.sentinel = parent_r
80
81 def close(self):
82 if self.finalizer is not None:
83 self.finalizer()
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