2 files changed, 71 insertions, 0 deletions

diff --git a/src/regress/lib/libc/sigthr/Makefile b/src/regress/lib/libc/sigthr/Makefile
new file mode 100644
index 0000000000..8ae4643e1e
--- /dev/null
+++ b/src/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/src/regress/lib/libc/sigthr/sigthr_test.c b/src/regress/lib/libc/sigthr/sigthr_test.c
new file mode 100644
index 0000000000..c2eaa1f779
--- /dev/null
+++ b/src/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;
+}