From 3ba3a6efbc5ac3517ca770c970552e70fabc95d5 Mon Sep 17 00:00:00 2001
From: guenther <guenther@openbsd.org>
Date: Thu, 22 Oct 2015 05:30:18 +0000
Subject: [PATCH] Add a regress for libc handling of SIGTHR

---
 regress/lib/libc/sigthr/Makefile      |  5 ++
 regress/lib/libc/sigthr/sigthr_test.c | 66 +++++++++++++++++++++++++++
 2 files changed, 71 insertions(+)
 create mode 100644 regress/lib/libc/sigthr/Makefile
 create mode 100644 regress/lib/libc/sigthr/sigthr_test.c

diff --git a/regress/lib/libc/sigthr/Makefile b/regress/lib/libc/sigthr/Makefile
new file mode 100644
index 00000000000..8ae4643e1e7
--- /dev/null
+++ b/regress/lib/libc/sigthr/Makefile
@@ -0,0 +1,5 @@
+#	$OpenBSD: Makefile,v 1.1 2015/10/22 05:30:18 guenther Exp $
+
+PROG=sigthr_test
+
+.include <bsd.regress.mk>
diff --git a/regress/lib/libc/sigthr/sigthr_test.c b/regress/lib/libc/sigthr/sigthr_test.c
new file mode 100644
index 00000000000..c2eaa1f7796
--- /dev/null
+++ b/regress/lib/libc/sigthr/sigthr_test.c
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2015  Philip Guenther <guenther@openbsd.org>
+ *
+ * Public domain.
+ *
+ * Verify that SIGTHR can't be blocked or caught by applications.
+ */
+
+#include <err.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+
+void sighandler(int sig) { }
+
+int
+main(void)
+{
+	struct sigaction sa;
+	sigset_t set, oset;
+
+	/*
+	 * check sigprocmask
+	 */
+	if (sigprocmask(SIG_BLOCK, NULL, &set))
+		err(1, "sigprocmask");
+	if (sigismember(&set, SIGTHR))
+		errx(1, "SIGTHR already blocked");
+	sigaddset(&set, SIGTHR);
+	if (sigprocmask(SIG_BLOCK, &set, NULL))
+		err(1, "sigprocmask");
+	if (sigprocmask(SIG_SETMASK, &set, &oset))
+		err(1, "sigprocmask");
+	if (sigismember(&oset, SIGTHR))
+		errx(1, "SIGTHR blocked with SIG_BLOCK");
+	if (sigprocmask(SIG_BLOCK, NULL, &oset))
+		err(1, "sigprocmask");
+	if (sigismember(&oset, SIGTHR))
+		errx(1, "SIGTHR blocked with SIG_SETMASK");
+
+	/*
+	 * check sigaction
+	 */
+	if (sigaction(SIGTHR, NULL, &sa) == 0)
+		errx(1, "sigaction(SIGTHR) succeeded");
+	else if (errno != EINVAL)
+		err(1, "sigaction(SIGTHR) didn't fail with EINVAL");
+	memset(&sa, 0, sizeof sa);
+	sa.sa_handler = sighandler;
+	sigfillset(&sa.sa_mask);
+	sa.sa_flags = 0;
+	if (sigaction(SIGTHR, &sa, NULL) == 0)
+		errx(1, "sigaction(SIGTHR) succeeded");
+	else if (errno != EINVAL)
+		err(1, "sigaction(SIGTHR) didn't fail with EINVAL");
+	if (sigaction(SIGUSR1, &sa, NULL))
+		err(1, "sigaction(SIGUSR1)");
+	if (sigaction(SIGUSR1, NULL, &sa))
+		err(1, "sigaction(SIGUSR1)");
+	if (sigismember(&sa.sa_mask, SIGTHR))
+		errx(1, "SIGTHR blocked with sigaction");
+
+	return 0;
+}
-- 
2.20.1