1 files changed, 35 insertions, 0 deletions
diff --git a/compiler-rt/test/msan/sigwait.cpp b/compiler-rt/test/msan/sigwait.cpp
new file mode 100644
index 00000000000..222fc34a169
--- /dev/null
+++ b/compiler-rt/test/msan/sigwait.cpp
@@ -0,0 +1,35 @@
+// RUN: %clangxx_msan -std=c++11 -O0 -g %s -o %t && %run %t
+// RUN: %clangxx_msan -DPOSITIVE -std=c++11 -O0 -g %s -o %t && not %run %t 2>&1 | FileCheck %s
+
+#include <assert.h>
+#include <signal.h>
+#include <sys/time.h>
+#include <unistd.h>
+
+#include <sanitizer/msan_interface.h>
+
+void test_sigwait() {
+  sigset_t s;
+#ifndef POSITIVE
+  sigemptyset(&s);
+  sigaddset(&s, SIGUSR1);
+#endif
+  sigprocmask(SIG_BLOCK, &s, 0);
+  // CHECK:  MemorySanitizer: use-of-uninitialized-value
+
+  if (pid_t pid = fork()) {
+    kill(pid, SIGUSR1);
+    _exit(0);
+  } else {
+    int sig;
+    int res = sigwait(&s, &sig);
+    assert(!res);
+    // The following checks that sig is initialized.
+    assert(sig == SIGUSR1);
+  }
+}
+
+int main(void) {
+  test_sigwait();
+  return 0;
+}