Errno.h

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//===- 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 <cerrno>
#include <string>
 
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 <typename FailT, typename Fun, typename... Args>
inline decltype(auto) RetryAfterSignal(const FailT &Fail, const Fun &F,
                                       const Args &... As) {
  decltype(F(As...)) Res;
  do {
    errno = 0;
    Res = F(As...);
  } while (Res == Fail && errno == EINTR);
  return Res;
}
 
}  // namespace sys
}  // namespace llvm
 
#endif // LLVM_SUPPORT_ERRNO_H