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71 lines
2.0 KiB
C++
71 lines
2.0 KiB
C++
/*
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nsjail - common macros
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-----------------------------------------
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Copyright 2014 Google Inc. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#ifndef NS_COMMON_H
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#define NS_COMMON_H
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#include <unistd.h>
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#include <utility>
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#if !defined(TEMP_FAILURE_RETRY)
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#define TEMP_FAILURE_RETRY(expression) \
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(__extension__({ \
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long int __result; \
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do __result = (long int)(expression); \
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while (__result == -1L && errno == EINTR); \
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__result; \
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}))
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#endif /* !defined(TEMP_FAILURE_RETRY) */
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#if !defined(ARR_SZ)
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#define ARR_SZ(array) (sizeof(array) / sizeof(*array))
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#endif /* !defined(ARR_SZ) */
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#define NS_VALSTR_STRUCT(x) {(uint64_t)x, #x}
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/* go-style defer */
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template <typename F>
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struct Defer {
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F f;
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Defer(F f) : f(std::move(f)) {
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}
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~Defer() noexcept {
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f();
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}
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Defer(const Defer&) = delete;
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Defer& operator=(const Defer&) = delete;
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Defer(Defer&&) = default;
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Defer& operator=(Defer&&) = default;
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};
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/* -Wctad-maybe-unsupported */
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template <typename F>
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Defer(F) -> Defer<F>;
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#define _DEFER_1(x, y) x##y
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#define _DEFER_2(x, y) _DEFER_1(x, y)
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#define _DEFER_3(x) _DEFER_2(x, __COUNTER__)
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#define defer [[maybe_unused]] Defer _DEFER_3(_defer_) = [&]()
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#endif /* NS_COMMON_H */
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