[VFS] Switch from close to SafelyCloseFileDescriptor

The SafelyCloseFileDescriptor machinery does the right thing in the face
of signals while close will do something platform specific which results
in the FD potentially getting leaked.

llvm-svn: 262687

diff --git a/clang/lib/Basic/VirtualFileSystem.cpp b/clang/lib/Basic/VirtualFileSystem.cpp
index 6977f40..ba846c8 100644 (file)
--- a/clang/lib/Basic/VirtualFileSystem.cpp
+++ b/clang/lib/Basic/VirtualFileSystem.cpp
@@ -19,6 +19,7 @@
 #include "llvm/Support/Errc.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
+#include "llvm/Support/Process.h"
 #include "llvm/Support/YAMLParser.h"
 #include "llvm/Config/llvm-config.h"
 #include <atomic>
@@ -158,21 +159,10 @@ RealFile::getBuffer(const Twine &Name, int64_t FileSize,
                                    IsVolatile);
 }
 
-// FIXME: This is terrible, we need this for ::close.
-#if !defined(_MSC_VER) && !defined(__MINGW32__)
-#include <unistd.h>
-#include <sys/uio.h>
-#else
-#include <io.h>
-#ifndef S_ISFIFO
-#define S_ISFIFO(x) (0)
-#endif
-#endif
 std::error_code RealFile::close() {
-  if (::close(FD))
-    return std::error_code(errno, std::generic_category());
+  std::error_code EC = sys::Process::SafelyCloseFileDescriptor(FD);
   FD = -1;
-  return std::error_code();
+  return EC;
 }
 
 namespace {