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bpo-40280: select: Use NULL for empty fdset (GH-31865) #31865

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merged 1 commit into from
Mar 14, 2022
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bpo-40280: select: Use NULL for empty fdset (GH-31865) #31865

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2 changes: 1 addition & 1 deletion Lib/test/test_select.py
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Original file line number Diff line number Diff line change
Expand Up @@ -46,7 +46,7 @@ def test_returned_list_identity(self):
self.assertIsNot(r, x)
self.assertIsNot(w, x)

@unittest.skipUnless(hasattr(os, 'popen'), "need os.popen()")
@support.requires_fork()
def test_select(self):
code = textwrap.dedent('''
import time
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2022-03-14-09-26-42.bpo-40280.2-k8TV.rst
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@@ -0,0 +1 @@
:func:`select.select` now passes ``NULL`` to ``select`` for each empty fdset.
7 changes: 6 additions & 1 deletion Modules/selectmodule.c
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Expand Up @@ -330,7 +330,12 @@ select_select_impl(PyObject *module, PyObject *rlist, PyObject *wlist,
do {
Py_BEGIN_ALLOW_THREADS
errno = 0;
n = select(max, &ifdset, &ofdset, &efdset, tvp);
n = select(
max,
imax ? &ifdset : NULL,
omax ? &ofdset : NULL,
emax ? &efdset : NULL,
tvp);
Py_END_ALLOW_THREADS

if (errno != EINTR)
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