1//===- llvm/Support/Errno.h - Portable+convenient errno handling -*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file declares some portable and convenient functions to deal with errno.
10//
11//===----------------------------------------------------------------------===//
12
13#ifndef LLVM_SUPPORT_ERRNO_H
14#define LLVM_SUPPORT_ERRNO_H
15
16#include <cerrno>
17#include <string>
18
19namespace llvm {
20namespace sys {
21
22/// Returns a string representation of the errno value, using whatever
23/// thread-safe variant of strerror() is available. Be sure to call this
24/// immediately after the function that set errno, or errno may have been
25/// overwritten by an intervening call.
26std::string StrError();
27
28/// Like the no-argument version above, but uses \p errnum instead of errno.
29std::string StrError(int errnum);
30
31template <typename FailT, typename Fun, typename... Args>
32inline decltype(auto) RetryAfterSignal(const FailT &Fail, const Fun &F,
33 const Args &... As) {
34 decltype(F(As...)) Res;
35 do {
36 errno = 0;
37 Res = F(As...);
38 } while (Res == Fail && errno == EINTR);
39 return Res;
40}
41
42} // namespace sys
43} // namespace llvm
44
45#endif // LLVM_SUPPORT_ERRNO_H
46