unittests/Support/ErrnoTest.cpp

//===- 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);

  errno = EINTR;
  EXPECT_EQ(-1, RetryAfterSignal(-1, [] { return -1; }));
}