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gh-96652: Fix faulthandler chained signal without sigaction() #96666

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merged 1 commit into from
Sep 8, 2022
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gh-96652: Fix faulthandler chained signal without sigaction() #96666

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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Library/2022-09-07-22-49-37.gh-issue-96652.YqOKxI.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
Fix the faulthandler implementation of ``faulthandler.register(signal,
chain=True)`` if the ``sigaction()`` function is not available: don't call
the previous signal handler if it's NULL. Patch by Victor Stinner.
2 changes: 1 addition & 1 deletion Modules/faulthandler.c
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Original file line number Diff line number Diff line change
Expand Up @@ -862,7 +862,7 @@ faulthandler_user(int signum)
errno = save_errno;
}
#else
if (user->chain) {
if (user->chain && user->previous != NULL) {
errno = save_errno;
/* call the previous signal handler */
user->previous(signum);
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