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ff2168bb61
The difference from the previous version is the use of decltype, as the implementation of std::result_of in libc++ did not work correctly for variadic function like open(2). Original summary: This function retries an operation if it was interrupted by a signal (failed with EINTR). It's inspired by the TEMP_FAILURE_RETRY macro in glibc, but I've turned that into a template function. I've also added a fail-value argument, to enable the function to be used with e.g. fopen(3), which is documented to fail for any reason that open(2) can fail (which includes EINTR). The main user of this function will be lldb, but there were also a couple of uses within llvm that I could simplify using this function. Reviewers: zturner, silvas, joerg Subscribers: mgorny, llvm-commits Differential Revision: https://reviews.llvm.org/D33895 llvm-svn: 306671
37 lines
1010 B
C++
37 lines
1010 B
C++
//===- ErrnoTest.cpp - Error handling unit tests --------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Errno.h"
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#include "gtest/gtest.h"
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using namespace llvm::sys;
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TEST(ErrnoTest, RetryAfterSignal) {
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EXPECT_EQ(1, RetryAfterSignal(-1, [] { return 1; }));
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EXPECT_EQ(-1, RetryAfterSignal(-1, [] {
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errno = EAGAIN;
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return -1;
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}));
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EXPECT_EQ(EAGAIN, errno);
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unsigned calls = 0;
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EXPECT_EQ(1, RetryAfterSignal(-1, [&calls] {
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errno = EINTR;
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++calls;
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return calls == 1 ? -1 : 1;
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}));
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EXPECT_EQ(2u, calls);
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EXPECT_EQ(1, RetryAfterSignal(-1, [](int x) { return x; }, 1));
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std::unique_ptr<int> P(RetryAfterSignal(nullptr, [] { return new int(47); }));
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EXPECT_EQ(47, *P);
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}
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