[PATCH v4 16/44] gdb: use process in xfer_partial if inferior_ptid is null_ptid

Some objects we want to xfer are per-process and do not necessarily
require a thread, e.g. the target description or libraries.

If we have not selected a thread, i.e. inferior_ptid is null_ptid, fall
back to the process for setting the general thread.  This allows fetching
those per-process objects.

This is in preparation for allowing inferiors without threads.
---
 gdb/remote.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/gdb/remote.c b/gdb/remote.c
index 05cda9d0b0c..50e90ad8440 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -12237,8 +12237,17 @@ remote_target::xfer_partial (enum target_object object,
   int unit_size
     = gdbarch_addressable_memory_unit_size (current_inferior ()->arch ());
 
+  /* Some objects require a thread, whereas others only require a process.
+     If we have no current thread, use the current process, instead.  */
+  ptid_t ptid = inferior_ptid;
+  if (ptid == null_ptid)
+    {
+      inferior *inf = current_inferior ();
+      if (inf != nullptr)
+	ptid = ptid_t (inf->pid);
+    }
   set_remote_traceframe ();
-  set_general_thread (inferior_ptid);
+  set_general_thread (ptid);
 
   rs = get_remote_state ();
 
-- 
2.43.0

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