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49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
//===- llvm/Support/Errno.h - Portable+convenient errno handling -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares some portable and convenient functions to deal with errno.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_ERRNO_H
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#define LLVM_SUPPORT_ERRNO_H
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#include <cerrno>
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#include <string>
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#include <type_traits>
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namespace llvm {
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namespace sys {
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/// Returns a string representation of the errno value, using whatever
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/// thread-safe variant of strerror() is available. Be sure to call this
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/// immediately after the function that set errno, or errno may have been
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/// overwritten by an intervening call.
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std::string StrError();
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/// Like the no-argument version above, but uses \p errnum instead of errno.
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std::string StrError(int errnum);
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template <typename Fun, typename... Args,
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typename ResultT =
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typename std::result_of<Fun const &(const Args &...)>::type>
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inline ResultT RetryAfterSignal(ResultT Fail, const Fun &F,
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const Args &... As) {
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ResultT Res;
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do
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Res = F(As...);
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while (Res == Fail && errno == EINTR);
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return Res;
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}
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} // namespace sys
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} // namespace llvm
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#endif // LLVM_SYSTEM_ERRNO_H
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