1 //===- llvm/Support/Errno.h - Portable+convenient errno handling -*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file declares some portable and convenient functions to deal with errno. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_SUPPORT_ERRNO_H 15 #define LLVM_SUPPORT_ERRNO_H 16 17 #include <cerrno> 18 #include <string> 19 #include <type_traits> 20 21 namespace llvm { 22 namespace sys { 23 24 /// Returns a string representation of the errno value, using whatever 25 /// thread-safe variant of strerror() is available. Be sure to call this 26 /// immediately after the function that set errno, or errno may have been 27 /// overwritten by an intervening call. 28 std::string StrError(); 29 30 /// Like the no-argument version above, but uses \p errnum instead of errno. 31 std::string StrError(int errnum); 32 33 template <typename FailT, typename Fun, typename... Args> 34 inline auto RetryAfterSignal(const FailT &Fail, const Fun &F, 35 const Args &... As) -> decltype(F(As...)) { 36 decltype(F(As...)) Res; 37 do 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
