[Python-checkins] bpo-33773: Fix test.support.fd_count() on Linux/FreBSD (GH-7421)
Miss Islington (bot)
webhook-mailer at python.org
Wed Jun 6 11:57:23 EDT 2018
https://github.com/python/cpython/commit/016aff77cbf5f63ed051a98ac628522a1cfd40a4
commit: 016aff77cbf5f63ed051a98ac628522a1cfd40a4
branch: 3.7
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: GitHub <noreply at github.com>
date: 2018-06-06T08:57:20-07:00
summary:
bpo-33773: Fix test.support.fd_count() on Linux/FreBSD (GH-7421)
Substract one because listdir() opens internally a file
descriptor to list the content of the /proc/self/fd/ directory.
Add test_support.test_fd_count().
Move also MAXFD code before msvcrt.CrtSetReportMode(), to make sure
that the report mode is always restored on failure.
(cherry picked from commit 492d6424a7ca907c8ec1df21e51062e8f3d88e32)
Co-authored-by: Victor Stinner <vstinner at redhat.com>
files:
M Lib/test/support/__init__.py
M Lib/test/test_support.py
diff --git a/Lib/test/support/__init__.py b/Lib/test/support/__init__.py
index 1024ab6ab922..ddcd2cc38759 100644
--- a/Lib/test/support/__init__.py
+++ b/Lib/test/support/__init__.py
@@ -2767,10 +2767,19 @@ def fd_count():
if sys.platform.startswith(('linux', 'freebsd')):
try:
names = os.listdir("/proc/self/fd")
- return len(names)
+ # Substract one because listdir() opens internally a file
+ # descriptor to list the content of the /proc/self/fd/ directory.
+ return len(names) - 1
except FileNotFoundError:
pass
+ MAXFD = 256
+ if hasattr(os, 'sysconf'):
+ try:
+ MAXFD = os.sysconf("SC_OPEN_MAX")
+ except OSError:
+ pass
+
old_modes = None
if sys.platform == 'win32':
# bpo-25306, bpo-31009: Call CrtSetReportMode() to not kill the process
@@ -2788,13 +2797,6 @@ def fd_count():
msvcrt.CRT_ASSERT):
old_modes[report_type] = msvcrt.CrtSetReportMode(report_type, 0)
- MAXFD = 256
- if hasattr(os, 'sysconf'):
- try:
- MAXFD = os.sysconf("SC_OPEN_MAX")
- except OSError:
- pass
-
try:
count = 0
for fd in range(MAXFD):
diff --git a/Lib/test/test_support.py b/Lib/test/test_support.py
index 36d5f849e1ad..89f1fbfb6c2b 100644
--- a/Lib/test/test_support.py
+++ b/Lib/test/test_support.py
@@ -569,6 +569,17 @@ def id(self):
self.assertTrue(support.match_test(test_access))
self.assertFalse(support.match_test(test_chdir))
+ def test_fd_count(self):
+ # We cannot test the absolute value of fd_count(): on old Linux
+ # kernel or glibc versions, os.urandom() keeps a FD open on
+ # /dev/urandom device and Python has 4 FD opens instead of 3.
+ start = support.fd_count()
+ fd = os.open(__file__, os.O_RDONLY)
+ try:
+ more = support.fd_count()
+ finally:
+ os.close(fd)
+ self.assertEqual(more - start, 1)
# XXX -follows a list of untested API
# make_legacy_pyc
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