Nov 7, 2022 · Nov 6, 2022 · Nov 6, 2022 · Nov 7, 2022
diff --git a/Misc/NEWS.d/next/Core and Builtins/2022-11-06-22-59-02.gh-issue-96055.TmQuJn.rst b/Misc/NEWS.d/next/Core and Builtins/2022-11-06-22-59-02.gh-issue-96055.TmQuJn.rst
 Update :mod:`faulthandler` to emit an error message with the proper
 unexpected signal number. Patch by Dong-hee Na.
diff --git a/Modules/faulthandler.c b/Modules/faulthandler.c
    size_t i;
    fault_handler_t *handler = NULL;
    int save_errno = errno;
    int found = 0;

    if (!fatal_error.enabled)
        return;

    for (i=0; i < faulthandler_nsignals; i++) {
        handler = &faulthandler_handlers[i];
        if (handler->signum == signum)
        if (handler->signum == signum) {
            found = 1;
            break;
        }
    }
    if (handler == NULL) {
        /* faulthandler_nsignals == 0 (unlikely) */
    /* restore the previous handler */
    faulthandler_disable_fatal_handler(handler);

    PUTS(fd, "Fatal Python error: ");
    PUTS(fd, handler->name);
    PUTS(fd, "\n\n");
    if (found) {
        PUTS(fd, "Fatal Python error: ");
        PUTS(fd, handler->name);
        PUTS(fd, "\n\n");
    }
    else {
        char unknown_signum[23] = {0,};
        snprintf(unknown_signum, 23, "%d", signum);
        PUTS(fd, "Fatal Python error from unexpected signum: ");
        PUTS(fd, unknown_signum);
        PUTS(fd, "\n\n");
    }

    faulthandler_dump_traceback(fd, fatal_error.all_threads,
                                fatal_error.interp);
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		Update :mod:`faulthandler` to emit an error message with the proper
		unexpected signal number. Patch by Dong-hee Na.
Original file line number	Diff line number	Diff line change
Expand Up		@@ -333,14 +333,17 @@ faulthandler_fatal_error(int signum)
		size_t i;
		fault_handler_t *handler = NULL;
		int save_errno = errno;
		int found = 0;

		if (!fatal_error.enabled)
		return;

		for (i=0; i < faulthandler_nsignals; i++) {
		handler = &faulthandler_handlers[i];
		if (handler->signum == signum)
		if (handler->signum == signum) {
		found = 1;
		break;
		}
		}
		if (handler == NULL) {
		/* faulthandler_nsignals == 0 (unlikely) */
Expand All		@@ -350,9 +353,18 @@ faulthandler_fatal_error(int signum)
		/* restore the previous handler */
		faulthandler_disable_fatal_handler(handler);

		PUTS(fd, "Fatal Python error: ");
		PUTS(fd, handler->name);
		PUTS(fd, "\n\n");
		if (found) {
		PUTS(fd, "Fatal Python error: ");
		PUTS(fd, handler->name);
		PUTS(fd, "\n\n");
		}
		else {
		char unknown_signum[23] = {0,};
		snprintf(unknown_signum, 23, "%d", signum);
		PUTS(fd, "Fatal Python error from unexpected signum: ");
		PUTS(fd, unknown_signum);
		PUTS(fd, "\n\n");
		}

		faulthandler_dump_traceback(fd, fatal_error.all_threads,
		fatal_error.interp);
Expand Down