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//===- llvm/Support/Errno.h - Portable+convenient errno handling -*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// 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>
#include <type_traits>
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 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
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