150 lines
4.8 KiB
C++
150 lines
4.8 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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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#pragma once
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#include <errno.h>
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#include <cstdio>
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#include <stdexcept>
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#include <system_error>
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#include <folly/Conv.h>
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#include <folly/FBString.h>
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#include <folly/Likely.h>
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#include <folly/Portability.h>
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namespace folly {
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// Various helpers to throw appropriate std::system_error exceptions from C
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// library errors (returned in errno, as positive return values (many POSIX
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// functions), or as negative return values (Linux syscalls))
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//
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// The *Explicit functions take an explicit value for errno.
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// On linux and similar platforms the value of `errno` is a mixture of
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// POSIX-`errno`-domain error codes and per-OS extended error codes. So the
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// most appropriate category to use is `system_category`.
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//
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// On Windows `system_category` means codes that can be returned by Win32 API
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// `GetLastError` and codes from the `errno`-domain must be reported as
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// `generic_category`.
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inline const std::error_category& errorCategoryForErrnoDomain() noexcept {
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if (kIsWindows) {
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return std::generic_category();
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}
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return std::system_category();
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}
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inline std::system_error makeSystemErrorExplicit(int err, const char* msg) {
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return std::system_error(err, errorCategoryForErrnoDomain(), msg);
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}
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template <class... Args>
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std::system_error makeSystemErrorExplicit(int err, Args&&... args) {
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return makeSystemErrorExplicit(
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err, to<fbstring>(std::forward<Args>(args)...).c_str());
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}
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inline std::system_error makeSystemError(const char* msg) {
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return makeSystemErrorExplicit(errno, msg);
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}
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template <class... Args>
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std::system_error makeSystemError(Args&&... args) {
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return makeSystemErrorExplicit(errno, std::forward<Args>(args)...);
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}
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// Helper to throw std::system_error
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[[noreturn]] inline void throwSystemErrorExplicit(int err, const char* msg) {
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throw_exception(makeSystemErrorExplicit(err, msg));
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}
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template <class... Args>
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[[noreturn]] void throwSystemErrorExplicit(int err, Args&&... args) {
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throw_exception(makeSystemErrorExplicit(err, std::forward<Args>(args)...));
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}
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// Helper to throw std::system_error from errno and components of a string
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template <class... Args>
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[[noreturn]] void throwSystemError(Args&&... args) {
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throwSystemErrorExplicit(errno, std::forward<Args>(args)...);
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}
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// Check a Posix return code (0 on success, error number on error), throw
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// on error.
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template <class... Args>
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void checkPosixError(int err, Args&&... args) {
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if (UNLIKELY(err != 0)) {
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throwSystemErrorExplicit(err, std::forward<Args>(args)...);
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}
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}
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// Check a Linux kernel-style return code (>= 0 on success, negative error
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// number on error), throw on error.
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template <class... Args>
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void checkKernelError(ssize_t ret, Args&&... args) {
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if (UNLIKELY(ret < 0)) {
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throwSystemErrorExplicit(int(-ret), std::forward<Args>(args)...);
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}
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}
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// Check a traditional Unix return code (-1 and sets errno on error), throw
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// on error.
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template <class... Args>
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void checkUnixError(ssize_t ret, Args&&... args) {
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if (UNLIKELY(ret == -1)) {
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throwSystemError(std::forward<Args>(args)...);
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}
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}
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template <class... Args>
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void checkUnixErrorExplicit(ssize_t ret, int savedErrno, Args&&... args) {
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if (UNLIKELY(ret == -1)) {
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throwSystemErrorExplicit(savedErrno, std::forward<Args>(args)...);
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}
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}
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// Check the return code from a fopen-style function (returns a non-nullptr
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// FILE* on success, nullptr on error, sets errno). Works with fopen, fdopen,
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// freopen, tmpfile, etc.
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template <class... Args>
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void checkFopenError(FILE* fp, Args&&... args) {
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if (UNLIKELY(!fp)) {
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throwSystemError(std::forward<Args>(args)...);
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}
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}
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template <class... Args>
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void checkFopenErrorExplicit(FILE* fp, int savedErrno, Args&&... args) {
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if (UNLIKELY(!fp)) {
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throwSystemErrorExplicit(savedErrno, std::forward<Args>(args)...);
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}
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}
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/**
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* If cond is not true, raise an exception of type E. E must have a ctor that
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* works with const char* (a description of the failure).
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*/
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#define CHECK_THROW(cond, E) \
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do { \
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if (!(cond)) { \
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folly::throw_exception<E>("Check failed: " #cond); \
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} \
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} while (0)
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} // namespace folly
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