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bpo-35537: use os.posix_spawn in subprocess #11242

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bpo-35537: use os.posix_spawn in subprocess #11242

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6726dac
use os.posix_spawn in subprocess
nanjekyejoannah Dec 18, 2018
f7df9e8
use os.posix_spawn in subprocess
nanjekyejoannah Dec 20, 2018
c05a078
📜🤖 Added by blurb_it.
blurb-it[bot] Dec 20, 2018
1b9357a
Fix test deciding if posix_spawn() can be used
vstinner Dec 20, 2018
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15 changes: 15 additions & 0 deletions Lib/subprocess.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1390,6 +1390,11 @@ def _get_handles(self, stdin, stdout, stderr):
errread, errwrite)


def _posix_spawn(self, args, executable):
"""Execute program using os.posix_spawn()."""
env = dict(os.environ)
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@vstinner vstinner Dec 19, 2018

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Is it really needeed to copy os.environ?
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@vstinner vstinner Dec 20, 2018

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I suggest to pass directly os.environ to os.posix_spawn().
self.pid = os.posix_spawn(executable, args, env)

def _execute_child(self, args, executable, preexec_fn, close_fds,
pass_fds, cwd, env,
startupinfo, creationflags, shell,
Expand All @@ -1414,6 +1419,16 @@ def _execute_child(self, args, executable, preexec_fn, close_fds,

if executable is None:
executable = args[0]

if (preexec_fn is None
and not close_fds
and not pass_fds
and cwd is None
and env is None
and restore_signals is False
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@vstinner vstinner Dec 19, 2018

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"and not restore_signals" would be better. I prefer to avoid "is" to compare with True/False.
and not start_new_session):
return self._posix_spawn(args, executable)
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@vstinner vstinner Dec 20, 2018

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I suggest to pass (executable, args) to follow os.posix_spawn() API. The function has not return value, so I suggest to write instead:

Suggested change
return self._posix_spawn(args, executable)
self._posix_spawn(executable, args)
return

orig_executable = executable

# For transferring possible exec failure from child to parent.
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