unittests/Support/ErrnoTest.cpp

   1 //===- ErrnoTest.cpp - Error handling unit tests --------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "llvm/Support/Errno.h"
  11 #include "gtest/gtest.h"
  12
  13 using namespace llvm::sys;
  14
  15 TEST(ErrnoTest, RetryAfterSignal) {
  16   EXPECT_EQ(1, RetryAfterSignal(-1, [] { return 1; }));
  17
  18   EXPECT_EQ(-1, RetryAfterSignal(-1, [] {
  19     errno = EAGAIN;
  20     return -1;
  21   }));
  22   EXPECT_EQ(EAGAIN, errno);
  23
  24   unsigned calls = 0;
  25   EXPECT_EQ(1, RetryAfterSignal(-1, [&calls] {
  26               errno = EINTR;
  27               ++calls;
  28               return calls == 1 ? -1 : 1;
  29             }));
  30   EXPECT_EQ(2u, calls);
  31
  32   EXPECT_EQ(1, RetryAfterSignal(-1, [](int x) { return x; }, 1));
  33
  34   std::unique_ptr<int> P(RetryAfterSignal(nullptr, [] { return new int(47); }));
  35   EXPECT_EQ(47, *P);
  36
  37   errno = EINTR;
  38   EXPECT_EQ(-1, RetryAfterSignal(-1, [] { return -1; }));
  39 }