[Python-checkins] bpo-40140: test_builtin.PtyTests registers SIGHUP handler (GH-19314)
Victor Stinner
webhook-mailer at python.org
Thu Apr 2 18:40:33 EDT 2020
https://github.com/python/cpython/commit/7a51a7e19f0143f75f8fc9ff68f93ed40937aec6
commit: 7a51a7e19f0143f75f8fc9ff68f93ed40937aec6
branch: master
author: Victor Stinner <vstinner at python.org>
committer: GitHub <noreply at github.com>
date: 2020-04-03T00:40:25+02:00
summary:
bpo-40140: test_builtin.PtyTests registers SIGHUP handler (GH-19314)
test_builtin.PtyTests now registers an handler for SIGHUP signal.
Closing the PTY file descriptor can emit a SIGHUP signal: just ignore
it.
run_child() now also closes the PTY file descriptor before waiting
for the process completition, otherwise the test hangs on AIX.
files:
M Lib/test/test_builtin.py
M Lib/test/test_pty.py
diff --git a/Lib/test/test_builtin.py b/Lib/test/test_builtin.py
index eaada1b50439b..290ba2cad8e5e 100644
--- a/Lib/test/test_builtin.py
+++ b/Lib/test/test_builtin.py
@@ -1837,7 +1837,21 @@ class PtyTests(unittest.TestCase):
"""Tests that use a pseudo terminal to guarantee stdin and stdout are
terminals in the test environment"""
+ @staticmethod
+ def handle_sighup(signum, frame):
+ # bpo-40140: if the process is the session leader, os.close(fd)
+ # of "pid, fd = pty.fork()" can raise SIGHUP signal:
+ # just ignore the signal.
+ pass
+
def run_child(self, child, terminal_input):
+ old_sighup = signal.signal(signal.SIGHUP, self.handle_sighup)
+ try:
+ return self._run_child(child, terminal_input)
+ finally:
+ signal.signal(signal.SIGHUP, old_sighup)
+
+ def _run_child(self, child, terminal_input):
r, w = os.pipe() # Pipe test results from child back to parent
try:
pid, fd = pty.fork()
@@ -1893,13 +1907,12 @@ def run_child(self, child, terminal_input):
self.fail("got %d lines in pipe but expected 2, child output was:\n%s"
% (len(lines), child_output))
- # Wait until the child process completes before closing the PTY to
- # prevent sending SIGHUP to the child process.
- support.wait_process(pid, exitcode=0)
-
- # Close the PTY
+ # bpo-40155: Close the PTY before waiting for the child process
+ # completion, otherwise the child process hangs on AIX.
os.close(fd)
+ support.wait_process(pid, exitcode=0)
+
return lines
def check_input_tty(self, prompt, terminal_input, stdio_encoding=None):
diff --git a/Lib/test/test_pty.py b/Lib/test/test_pty.py
index aa5c68790f7ca..9c32467cbbd64 100644
--- a/Lib/test/test_pty.py
+++ b/Lib/test/test_pty.py
@@ -70,7 +70,7 @@ def setUp(self):
self.addCleanup(signal.signal, signal.SIGALRM, old_alarm)
old_sighup = signal.signal(signal.SIGHUP, self.handle_sighup)
- self.addCleanup(signal.signal, signal.SIGHUP, old_alarm)
+ self.addCleanup(signal.signal, signal.SIGHUP, old_sighup)
# isatty() and close() can hang on some platforms. Set an alarm
# before running the test to make sure we don't hang forever.
@@ -81,8 +81,8 @@ def handle_sig(self, sig, frame):
self.fail("isatty hung")
@staticmethod
- def handle_sighup(sig, frame):
- # if the process is the session leader, os.close(master_fd)
+ def handle_sighup(signum, frame):
+ # bpo-38547: if the process is the session leader, os.close(master_fd)
# of "master_fd, slave_name = pty.master_open()" raises SIGHUP
# signal: just ignore the signal.
pass
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