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  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.  
  19. namespace llvm {
  20. namespace 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.
  26. std::string StrError();
  27.  
  28. /// Like the no-argument version above, but uses \p errnum instead of errno.
  29. std::string StrError(int errnum);
  30.  
  31. template <typename FailT, typename Fun, typename... Args>
  32. inline 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.