Add a version of sys::fs::status that uses fstat.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186378 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 30 insertions, 18 deletions

diff --git a/lib/Support/Unix/Path.inc b/lib/Support/Unix/Path.inc
index 484296cdee..9795b6e34b 100644
--- a/lib/Support/Unix/Path.inc
+++ b/lib/Support/Unix/Path.inc
@@ -541,43 +541,55 @@ error_code getUniqueID(const Twine Path, uint64_t &Result) {
   return error_code::success();
 }
 
-error_code status(const Twine &path, file_status &result) {
-  SmallString<128> path_storage;
-  StringRef p = path.toNullTerminatedStringRef(path_storage);
-
-  struct stat status;
-  if (::stat(p.begin(), &status) != 0) {
+static error_code fillStatus(int StatRet, const struct stat &Status,
+                             file_status &Result) {
+  if (StatRet != 0) {
     error_code ec(errno, system_category());
     if (ec == errc::no_such_file_or_directory)
-      result = file_status(file_type::file_not_found);
+      Result = file_status(file_type::file_not_found);
     else
-      result = file_status(file_type::status_error);
+      Result = file_status(file_type::status_error);
     return ec;
   }
 
-  perms prms = static_cast<perms>(status.st_mode);
   file_type Type = file_type::type_unknown;
 
-  if (S_ISDIR(status.st_mode))
+  if (S_ISDIR(Status.st_mode))
     Type = file_type::directory_file;
-  else if (S_ISREG(status.st_mode))
+  else if (S_ISREG(Status.st_mode))
     Type = file_type::regular_file;
-  else if (S_ISBLK(status.st_mode))
+  else if (S_ISBLK(Status.st_mode))
     Type = file_type::block_file;
-  else if (S_ISCHR(status.st_mode))
+  else if (S_ISCHR(Status.st_mode))
     Type = file_type::character_file;
-  else if (S_ISFIFO(status.st_mode))
+  else if (S_ISFIFO(Status.st_mode))
     Type = file_type::fifo_file;
-  else if (S_ISSOCK(status.st_mode))
+  else if (S_ISSOCK(Status.st_mode))
     Type = file_type::socket_file;
 
-  result =
-      file_status(Type, prms, status.st_dev, status.st_ino, status.st_mtime,
-                  status.st_uid, status.st_gid, status.st_size);
+  perms Perms = static_cast<perms>(Status.st_mode);
+  Result =
+      file_status(Type, Perms, Status.st_dev, Status.st_ino, Status.st_mtime,
+                  Status.st_uid, Status.st_gid, Status.st_size);
 
   return error_code::success();
 }
 
+error_code status(const Twine &Path, file_status &Result) {
+  SmallString<128> PathStorage;
+  StringRef P = Path.toNullTerminatedStringRef(PathStorage);
+
+  struct stat Status;
+  int StatRet = ::stat(P.begin(), &Status);
+  return fillStatus(StatRet, Status, Result);
+}
+
+error_code status(int FD, file_status &Result) {
+  struct stat Status;
+  int StatRet = ::fstat(FD, &Status);
+  return fillStatus(StatRet, Status, Result);
+}
+
 error_code setLastModificationAndAccessTime(int FD, TimeValue Time) {
 #if defined(HAVE_FUTIMENS)
   timespec Times[2];