[lldb] Add new commands and tests for getting file perms & exists

Add two new commands 'platform get-file-permissions' and 'platform
file-exists' for the respective bits of LLDB protocol.  Add tests for
them.  Fix error handling in GetFilePermissions().

Differential Revision: https://reviews.llvm.org/D107809

1 files changed, 4 insertions, 3 deletions

diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerCommon.cpp b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerCommon.cpp
index 4109374..248fd57 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerCommon.cpp
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerCommon.cpp
@@ -661,9 +661,10 @@ GDBRemoteCommunicationServerCommon::Handle_vFile_Mode(
     std::error_code ec;
     const uint32_t mode = FileSystem::Instance().GetPermissions(file_spec, ec);
     StreamString response;
-    response.Printf("F%x", mode);
-    if (mode == 0 || ec)
-      response.Printf(",%x", (int)Status(ec).GetError());
+    if (mode != llvm::sys::fs::perms_not_known)
+      response.Printf("F%x", mode);
+    else
+      response.Printf("F-1,%x", (int)Status(ec).GetError());
     return SendPacketNoLock(response.GetString());
   }
   return SendErrorResponse(23);