Revert "[Support] Add RetryAfterSignal helper function" and subsequent fix

The fix in r306003 uncovered a pretty fundamental problem that libc++
implementation of std::result_of does not handle the prototype of
open(2) correctly (presumably because it contains ...). This makes the
whole function unusable in its current form, so I am also reverting the
original commit (r305892), which introduced the function, at least until
I figure out a way to solve the libc++ issue.

llvm-svn: 306005

1 files changed, 0 insertions, 38 deletions

diff --git a/llvm/unittests/Support/ErrnoTest.cpp b/llvm/unittests/Support/ErrnoTest.cpp
deleted file mode 100644
index 888c162822d..00000000000
--- a/llvm/unittests/Support/ErrnoTest.cpp
+++ /dev/null
@@ -1,38 +0,0 @@
-//===- 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;
-
-static int *ReturnPointer() { return new int(47); }
-
-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, ReturnPointer)};
-  EXPECT_EQ(47, *P);
-}