1 files changed, 54 insertions, 0 deletions
diff --git a/regress/sys/kern/stackjmp/stackjmp.c b/regress/sys/kern/stackjmp/stackjmp.c
new file mode 100644
index 00000000000..aa73c2d97a0
--- /dev/null
+++ b/regress/sys/kern/stackjmp/stackjmp.c
@@ -0,0 +1,54 @@
+/*	$OpenBSD: stackjmp.c,v 1.1 2012/06/23 05:54:49 matthew Exp $	*/
+#include <assert.h>
+#include <setjmp.h>
+#include <signal.h>
+#include <string.h>
+#include <unistd.h>
+
+static jmp_buf jb;
+static char buf[SIGSTKSZ];
+static volatile int handled;
+
+static int
+isaltstack()
+{
+	stack_t os;
+	assert(sigaltstack(NULL, &os) == 0);
+	return (os.ss_flags & SS_ONSTACK) != 0;
+}
+
+static void
+inthandler(int signo)
+{
+	assert(isaltstack());
+	handled = 1;
+	siglongjmp(jb, 1);
+}
+
+int
+main()
+{
+	struct sigaction sa;
+	stack_t stack;
+
+	memset(&sa, 0, sizeof(sa));
+	sa.sa_handler = inthandler;
+	sa.sa_flags = SA_ONSTACK;
+	assert(sigaction(SIGINT, &sa, NULL) == 0);
+
+	memset(&stack, 0, sizeof(stack));
+	stack.ss_sp = buf;
+	stack.ss_size = sizeof(buf);
+	stack.ss_flags = 0;
+	assert(sigaltstack(&stack, NULL) == 0);
+
+	assert(!isaltstack());
+	sigsetjmp(jb, 1);
+	assert(!isaltstack());
+	if (!handled) {
+		kill(getpid(), SIGINT);
+		assert(0); /* Shouldn't reach here. */
+	}
+
+	return (0);
+}