New submission from Antoine Pitrou:
The documentation for multiprocessing.exitcode says:
"""
The child’s exit code. This will be None if the process has not yet
terminated. A negative value -N indicates that the child was terminated by
signal N.
"""
This is true for the "fork" method, but not "forkserver" where a child
terminated by a signal will get an exitcode of 255. This is because forkserver
relies on the child writing its own exit code in a pipe, which obviously
doesn't work if it was killed (255 is simply a fallback value).
See forkserver's Popen.poll():
def poll(self, flag=os.WNOHANG):
if self.returncode is None:
from multiprocessing.connection import wait
timeout = 0 if flag == os.WNOHANG else None
if not wait([self.sentinel], timeout):
return None
try:
self.returncode = forkserver.read_unsigned(self.sentinel)
except (OSError, EOFError):
# The process ended abnormally perhaps because of a signal
self.returncode = 255
return self.returncode
----------
components: Library (Lib)
messages: 295343
nosy: davin, pitrou, sbt
priority: normal
severity: normal
status: open
title: With forkserver, Process.exitcode does not get signal number
type: behavior
versions: Python 3.5, Python 3.6, Python 3.7
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Python tracker <[email protected]>
<http://bugs.python.org/issue30589>
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