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a3c582d708
Summary: Add a new utils/SystemError.h header with helper functions to check if a `std::system_error` contains an errno value. Most of the code in Eden previously only checked for `std::system_category` when looking for errno values. `std::generic_category` is the correct category to use for errno exceptions, but folly/Exception.h incorrectly throws them as `std::system_category` today. This change makes Eden treat either error type as errno values for now. Reviewed By: yfeldblum Differential Revision: D7329999 fbshipit-source-id: 67a3c3ea10371c53a2e34236b7575deac4cbd53a
38 lines
1.1 KiB
C++
38 lines
1.1 KiB
C++
/*
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* Copyright (c) 2004-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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*/
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#pragma once
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#include <system_error>
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namespace facebook {
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namespace eden {
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/**
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* Return true if this exception contains an errno value in ex.code().value()
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*/
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inline bool isErrnoError(const std::system_error& ex) {
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// std::generic_category is the correct category to represent errno values.
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// However folly/Exception.h unfortunately throws errno values as
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// std::system_category for now.
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return (
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ex.code().category() == std::generic_category() ||
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ex.code().category() == std::system_category());
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}
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/**
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* Return true if this exception is equivalent to an ENOENT error code.
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*/
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inline bool isEnoent(const std::system_error& ex) {
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return isErrnoError(ex) && ex.code().value() == ENOENT;
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}
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} // namespace eden
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} // namespace facebook
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