LLVM  6.0.0svn
Errno.h
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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
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
F(f)
std::string StrError()
Returns a string representation of the errno value, using whatever thread-safe variant of strerror() ...
Definition: Errno.cpp:32
#define Fail
auto RetryAfterSignal(const FailT &Fail, const Fun &F, const Args &... As) -> decltype(F(As...))
Definition: Errno.h:34
constexpr char Args[]
Key for Kernel::Metadata::mArgs.