[lldb] Add a function to check if lldb is running in an interactive s…

…ession

This patch adds a function to check if lldb is running in an interactive
debug session. Currently this API only works on macOS. It's expected to
be used in combination with Host::OpenFileInExternalEditor.

Differential revision: https://reviews.llvm.org/D124872

lldb/include/lldb/Host/Host.h

@@ -242,6 +242,13 @@ class Host {
   static bool OpenFileInExternalEditor(const FileSpec &file_spec,
                                        uint32_t line_no);
 
+  /// Check if we're running in an interactive graphical session.
+  ///
+  /// \return
+  ///     True if we're running in an interactive graphical session. False if
+  ///     we're not or don't know.
+  static bool IsInteractiveGraphicSession();
+
   static Environment GetEnvironment();
 
   static std::unique_ptr<Connection>

lldb/source/Host/common/Host.cpp

@@ -575,6 +575,7 @@ bool Host::OpenFileInExternalEditor(const FileSpec &file_spec,
   return false;
 }
 
+bool Host::IsInteractiveGraphicSession() { return false; }
 #endif
 
 std::unique_ptr<Connection> Host::CreateDefaultConnection(llvm::StringRef url) {

lldb/source/Host/macosx/objcxx/Host.mm

@@ -32,6 +32,8 @@
 #define LauncherXPCServiceErrorTypeKey "errorType"
 #define LauncherXPCServiceCodeTypeKey "errorCode"
 
+#include <bsm/audit.h>
+#include <bsm/audit_session.h>
 #endif
 
 #include "llvm/Support/Host.h"
@@ -406,6 +408,16 @@ repeat with the_window in (get windows)\n\
 #endif // TARGET_OS_OSX
 }
 
+bool Host::IsInteractiveGraphicSession() {
+#if !TARGET_OS_OSX
+  return false;
+#else
+  auditinfo_addr_t info;
+  getaudit_addr(&info, sizeof(info));
+  return info.ai_flags & AU_SESSION_FLAG_HAS_GRAPHIC_ACCESS;
+#endif
+}
+
 Environment Host::GetEnvironment() { return Environment(*_NSGetEnviron()); }
 
 static bool GetMacOSXProcessCPUType(ProcessInstanceInfo &process_info) {