python3.5/00302-fix-multiprocessing-regression-on-newer-glibcs.patch
Miro Hrončok 712f3838b8 Fix multiprocessing regression on newer glibcs
Enable test_multiprocessing_fork(server) and _spawn again

Resolves: rhbz#1569933
2018-04-23 21:13:08 +02:00

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2.3 KiB
Diff

From a3febe3cba14b89885f42ca2f0224096a52885f6 Mon Sep 17 00:00:00 2001
From: Antoine Pitrou <antoine@python.org>
Date: Mon, 23 Apr 2018 13:19:42 +0200
Subject: [PATCH] bpo-33329: Fix multiprocessing regression on newer glibcs
Starting with glibc 2.27.9000-xxx, sigaddset() can return EINVAL for some
reserved signal numbers between 1 and NSIG. The `range(1, NSIG)` idiom
is commonly used to select all signals for blocking with `pthread_sigmask`.
So we ignore the sigaddset() return value until we expose sigfillset()
to provide a better idiom.
---
.../next/Library/2018-04-23-13-21-39.bpo-33329.lQ-Eod.rst | 1 +
Modules/signalmodule.c | 14 ++++++++------
2 files changed, 9 insertions(+), 6 deletions(-)
create mode 100644 Misc/NEWS.d/next/Library/2018-04-23-13-21-39.bpo-33329.lQ-Eod.rst
diff --git a/Misc/NEWS.d/next/Library/2018-04-23-13-21-39.bpo-33329.lQ-Eod.rst b/Misc/NEWS.d/next/Library/2018-04-23-13-21-39.bpo-33329.lQ-Eod.rst
new file mode 100644
index 000000000000..d1a4e56d04b9
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2018-04-23-13-21-39.bpo-33329.lQ-Eod.rst
@@ -0,0 +1 @@
+Fix multiprocessing regression on newer glibcs
diff --git a/Modules/signalmodule.c b/Modules/signalmodule.c
index 791616014384..35fd87e2d1e7 100644
--- a/Modules/signalmodule.c
+++ b/Modules/signalmodule.c
@@ -819,7 +819,6 @@ iterable_to_sigset(PyObject *iterable, sigset_t *mask)
int result = -1;
PyObject *iterator, *item;
long signum;
- int err;
sigemptyset(mask);
@@ -841,11 +840,14 @@ iterable_to_sigset(PyObject *iterable, sigset_t *mask)
Py_DECREF(item);
if (signum == -1 && PyErr_Occurred())
goto error;
- if (0 < signum && signum < NSIG)
- err = sigaddset(mask, (int)signum);
- else
- err = 1;
- if (err) {
+ if (0 < signum && signum < NSIG) {
+ /* bpo-33329: ignore sigaddset() return value as it can fail
+ * for some reserved signals, but we want the `range(1, NSIG)`
+ * idiom to allow selecting all valid signals.
+ */
+ (void) sigaddset(mask, (int)signum);
+ }
+ else {
PyErr_Format(PyExc_ValueError,
"signal number %ld out of range", signum);
goto error;