[Support] Remove getPathFromOpenFD, it was unused

Summary:
It was added to support clang warnings about includes with case
mismatches, but it ended up not being necessary.

Reviewers: twoh, rafael

Subscribers: hiraditya, llvm-commits

Differential Revision: https://reviews.llvm.org/D36328

llvm-svn: 310078

1 files changed, 0 insertions, 47 deletions

diff --git a/llvm/lib/Support/Unix/Path.inc b/llvm/lib/Support/Unix/Path.inc
index 250a15dc5a7..3099c270944 100644
--- a/llvm/lib/Support/Unix/Path.inc
+++ b/llvm/lib/Support/Unix/Path.inc
@@ -807,53 +807,6 @@ std::error_code openFileForWrite(const Twine &Name, int &ResultFD,
   return std::error_code();
 }
 
-std::error_code getPathFromOpenFD(int FD, SmallVectorImpl<char> &ResultPath) {
-  if (FD < 0)
-    return make_error_code(errc::bad_file_descriptor);
-
-#if defined(F_GETPATH)
-  // When F_GETPATH is availble, it is the quickest way to get
-  // the path from a file descriptor.
-  ResultPath.reserve(MAXPATHLEN);
-  if (::fcntl(FD, F_GETPATH, ResultPath.begin()) == -1)
-    return std::error_code(errno, std::generic_category());
-
-  ResultPath.set_size(strlen(ResultPath.begin()));
-#else
-  // If we have a /proc filesystem mounted, we can quickly establish the
-  // real name of the file with readlink. Otherwise, we don't know how to
-  // get the filename from a file descriptor. Give up.
-  if (!fs::hasProcSelfFD())
-    return make_error_code(errc::function_not_supported);
-
-  ResultPath.reserve(PATH_MAX);
-  char ProcPath[64];
-  snprintf(ProcPath, sizeof(ProcPath), "/proc/self/fd/%d", FD);
-  ssize_t CharCount = ::readlink(ProcPath, ResultPath.begin(), ResultPath.capacity());
-  if (CharCount < 0)
-      return std::error_code(errno, std::generic_category());
-
-  // Was the filename truncated?
-  if (static_cast<size_t>(CharCount) == ResultPath.capacity()) {
-    // Use lstat to get the size of the filename
-    struct stat sb;
-    if (::lstat(ProcPath, &sb) < 0)
-      return std::error_code(errno, std::generic_category());
-
-    ResultPath.reserve(sb.st_size + 1);
-    CharCount = ::readlink(ProcPath, ResultPath.begin(), ResultPath.capacity());
-    if (CharCount < 0)
-      return std::error_code(errno, std::generic_category());
-
-    // Test for race condition: did the link size change?
-    if (CharCount > sb.st_size)
-      return std::error_code(ENAMETOOLONG, std::generic_category());
-  }
-  ResultPath.set_size(static_cast<size_t>(CharCount));
-#endif
-  return std::error_code();
-}
-
 template <typename T>
 static std::error_code remove_directories_impl(const T &Entry,
                                                bool IgnoreErrors) {