//===- llvm/Support/Errno.h - Portable+convenient errno handling -*- C++ -*-===// // // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. // See https://llvm.org/LICENSE.txt for license information. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // //===----------------------------------------------------------------------===// // // This file declares some portable and convenient functions to deal with errno. // //===----------------------------------------------------------------------===// #ifndef LLVM_SUPPORT_ERRNO_H #define LLVM_SUPPORT_ERRNO_H #include #include #include namespace llvm { namespace sys { /// Returns a string representation of the errno value, using whatever /// thread-safe variant of strerror() is available. Be sure to call this /// immediately after the function that set errno, or errno may have been /// overwritten by an intervening call. std::string StrError(); /// Like the no-argument version above, but uses \p errnum instead of errno. std::string StrError(int errnum); template inline auto RetryAfterSignal(const FailT &Fail, const Fun &F, const Args &... As) -> decltype(F(As...)) { decltype(F(As...)) Res; do { errno = 0; Res = F(As...); } while (Res == Fail && errno == EINTR); return Res; } } // namespace sys } // namespace llvm #endif // LLVM_SYSTEM_ERRNO_H