2 * Copyright 2013 Facebook, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #ifndef FOLLY_EXCEPTION_H_
18 #define FOLLY_EXCEPTION_H_
23 #include <system_error>
25 #include "folly/Conv.h"
26 #include "folly/Likely.h"
27 #include "folly/Portability.h"
31 // Helper to throw std::system_error
32 void throwSystemError(int err, const char* msg) FOLLY_NORETURN;
33 inline void throwSystemError(int err, const char* msg) {
34 throw std::system_error(err, std::system_category(), msg);
37 // Helper to throw std::system_error from errno
38 void throwSystemError(const char* msg) FOLLY_NORETURN;
39 inline void throwSystemError(const char* msg) {
40 throwSystemError(errno, msg);
43 // Helper to throw std::system_error from errno and components of a string
44 template <class... Args>
45 void throwSystemError(Args... args) FOLLY_NORETURN;
46 template <class... Args>
47 inline void throwSystemError(Args... args) {
48 throwSystemError(errno, folly::to<std::string>(args...));
51 // Check a Posix return code (0 on success, error number on error), throw
53 inline void checkPosixError(int err, const char* msg) {
54 if (UNLIKELY(err != 0)) {
55 throwSystemError(err, msg);
59 // Check a Linux kernel-style return code (>= 0 on success, negative error
60 // number on error), throw on error.
61 inline void checkKernelError(ssize_t ret, const char* msg) {
62 if (UNLIKELY(ret < 0)) {
63 throwSystemError(-ret, msg);
67 // Check a traditional Unix return code (-1 and sets errno on error), throw
69 inline void checkUnixError(ssize_t ret, const char* msg) {
70 if (UNLIKELY(ret == -1)) {
71 throwSystemError(msg);
74 inline void checkUnixError(ssize_t ret, int savedErrno, const char* msg) {
75 if (UNLIKELY(ret == -1)) {
76 throwSystemError(savedErrno, msg);
82 #endif /* FOLLY_EXCEPTION_H_ */