143 lines
4.5 KiB
C++
143 lines
4.5 KiB
C++
/*
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* Copyright 2013-present Facebook, Inc.
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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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inline std::system_error makeSystemErrorExplicit(int err, const char* msg) {
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// TODO: The C++ standard indicates that std::generic_category() should be
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// used for POSIX errno codes.
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//
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// We should ideally change this to use std::generic_category() instead of
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// std::system_category(). However, undertaking this change will require
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// updating existing call sites that currently catch exceptions thrown by
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// this code and currently expect std::system_category.
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return std::system_error(err, std::system_category(), 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 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 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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throw E("Check failed: " #cond); \
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} \
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} while (0)
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} // namespace folly
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