QPassSignals in non-stop mode

[Pedro Alves <pedro at codesourcery dot com>]

I've applied this patch.

I just noticed that "handle SIGFOO pass/nopass what/whatnot"
wasn't immediately informing the remote end of what is the
new set of signals it can silently pass to the inferior without
informing gdb.  Currently, we only do that on resume, which is
only good enough for all-stop.  In non-stop, if threads are
running, I don't want to wait for the next resume (explicitly
requested, or, due to an internal event handling) to make it
effective.

Fortunatelly, we already have a target_ops method for this,
called from within the "handle" command, whenever the
signals pass/stop/print states changes.

-- 
Pedro Alves

2010-05-03  Pedro Alves  <pedro@codesourcery.com>

	gdb/
	* remote.c (remote_notice_signals): New.
	(remote_start_remote): In non-stop mode, update the remote end on
	which signals it can silently pass.
	(init_remote_ops): Install remote_notice_signals.

---
 gdb/remote.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

Index: src/gdb/remote.c
===================================================================
--- src.orig/gdb/remote.c	2010-05-03 02:50:12.000000000 +0100
+++ src/gdb/remote.c	2010-05-03 02:50:15.000000000 +0100
@@ -1535,6 +1535,14 @@ remote_pass_signals (void)
     }
 }
 
+static void
+remote_notice_signals (ptid_t ptid)
+{
+  /* Update the remote on signals to silently pass, if they've
+     changed.  */
+  remote_pass_signals ();
+}
+
 /* If PTID is MAGIC_NULL_PTID, don't set any thread.  If PTID is
    MINUS_ONE_PTID, set the thread to -1, so the stub returns the
    thread.  If GEN is set, set the general thread, if not, then set
@@ -3155,6 +3163,11 @@ remote_start_remote (struct ui_out *uiou
       /* In non-stop mode, any cached wait status will be stored in
 	 the stop reply queue.  */
       gdb_assert (wait_status == NULL);
+
+      /* Update the remote on signals to silently pass, or more
+	 importantly, which to not ignore, in case a previous session
+	 had set some different set of signals to be ignored.  */
+      remote_pass_signals ();
     }
 
   /* If we connected to a live target, do some additional setup.  */
@@ -9898,6 +9911,7 @@ Specify the serial device it is connecte
   remote_ops.to_kill = remote_kill;
   remote_ops.to_load = generic_load;
   remote_ops.to_mourn_inferior = remote_mourn;
+  remote_ops.to_notice_signals = remote_notice_signals;
   remote_ops.to_thread_alive = remote_thread_alive;
   remote_ops.to_find_new_threads = remote_threads_info;
   remote_ops.to_pid_to_str = remote_pid_to_str;