1 files changed, 29 insertions, 0 deletions
diff --git a/gdbserver/linux-low.h b/gdbserver/linux-low.h
index 05067ff..819f915 100644
--- a/gdbserver/linux-low.h
+++ b/gdbserver/linux-low.h
@@ -311,6 +311,8 @@ public:
 		      int *handle_len) override;
 #endif
 
+  thread_info *thread_pending_parent (thread_info *thread) override;
+
   bool supports_catch_syscall () override;
 
   /* Return the information to access registers.  This has public
@@ -721,6 +723,33 @@ struct pending_signal
 
 struct lwp_info
 {
+  /* If this LWP is a fork child that wasn't reported to GDB yet, return
+     its parent, else nullptr.  */
+  lwp_info *pending_parent () const
+  {
+    if (this->fork_relative == nullptr)
+      return nullptr;
+
+    gdb_assert (this->fork_relative->fork_relative == this);
+
+    /* In a fork parent/child relationship, the parent has a status pending and
+       the child does not, and a thread can only be in one such relationship
+       at most.  So we can recognize who is the parent based on which one has
+       a pending status.  */
+    gdb_assert (!!this->status_pending_p
+		!= !!this->fork_relative->status_pending_p);
+
+    if (!this->fork_relative->status_pending_p)
+      return nullptr;
+
+    const target_waitstatus &ws
+      = this->fork_relative->waitstatus;
+    gdb_assert (ws.kind () == TARGET_WAITKIND_FORKED
+		|| ws.kind () == TARGET_WAITKIND_VFORKED);
+
+    return this->fork_relative;
+  }
+
   /* Backlink to the parent object.  */
   struct thread_info *thread = nullptr;