1 files changed, 36 insertions, 0 deletions
diff --git a/unittests/Support/ErrnoTest.cpp b/unittests/Support/ErrnoTest.cpp
new file mode 100644
index 0000000000000..67f834a938da6
--- /dev/null
+++ b/unittests/Support/ErrnoTest.cpp
@@ -0,0 +1,36 @@
+//===- ErrnoTest.cpp - Error handling unit tests --------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/Errno.h"
+#include "gtest/gtest.h"
+
+using namespace llvm::sys;
+
+TEST(ErrnoTest, RetryAfterSignal) {
+  EXPECT_EQ(1, RetryAfterSignal(-1, [] { return 1; }));
+
+  EXPECT_EQ(-1, RetryAfterSignal(-1, [] {
+    errno = EAGAIN;
+    return -1;
+  }));
+  EXPECT_EQ(EAGAIN, errno);
+
+  unsigned calls = 0;
+  EXPECT_EQ(1, RetryAfterSignal(-1, [&calls] {
+              errno = EINTR;
+              ++calls;
+              return calls == 1 ? -1 : 1;
+            }));
+  EXPECT_EQ(2u, calls);
+
+  EXPECT_EQ(1, RetryAfterSignal(-1, [](int x) { return x; }, 1));
+
+  std::unique_ptr<int> P(RetryAfterSignal(nullptr, [] { return new int(47); }));
+  EXPECT_EQ(47, *P);
+}