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#include <type_traits> 19 20namespace llvm { 21namespace sys { 22 23/// Returns a string representation of the errno value, using whatever 24/// thread-safe variant of strerror() is available. Be sure to call this 25/// immediately after the function that set errno, or errno may have been 26/// overwritten by an intervening call. 27std::string StrError(); 28 29/// Like the no-argument version above, but uses \p errnum instead of errno. 30std::string StrError(int errnum); 31 32template <typename FailT, typename Fun, typename... Args> 33inline auto RetryAfterSignal(const FailT &Fail, const Fun &F, 34 const Args &... As) -> decltype(F(As...)) { 35 decltype(F(As...)) Res; 36 do { 37 errno = 0; 38 Res = F(As...); 39 } while (Res == Fail && errno == EINTR); 40 return Res; 41} 42 43} // namespace sys 44} // namespace llvm 45 46#endif // LLVM_SYSTEM_ERRNO_H 47