Add a note about how the "isFile" check in Path::eraseFromDisk prevents

the erasure of non-file paths like /dev/null.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29539 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/System/Unix/Path.inc b/lib/System/Unix/Path.inc
index 83885c3..f79b2b2 100644 (file)
--- a/lib/System/Unix/Path.inc
+++ b/lib/System/Unix/Path.inc
@@ -569,6 +569,11 @@ Path::eraseFromDisk(bool remove_contents, std::string *ErrStr) const {
   if (getFileStatus(Status, ErrStr))
     return true;
     
+  // Note: this check catches strange situations. In all cases, LLVM should only
+  // be involved in the creation and deletion of regular files.  This check 
+  // ensures that what we're trying to erase is a regular file. It effectively
+  // prevents LLVM from erasing things like /dev/null, any block special file,
+  // or other things that aren't "regular" files. 
   if (Status.isFile) {
     if (unlink(path.c_str()) != 0)
       return GetErrno(path + ": can't destroy file", ErrStr);