2012-03-07 Pedro Alves <palves@redhat.com>

	gdb/doc/
	* gdb.texinfo (General Query Packets): Document new
	QProgramSignals packet.
	* gdb.texinfo (Remote configuration): Mention
	"program-signals-packet".

	gdb/gdbserver/
	* linux-low.c (get_detach_signal): New.
	(linux_detach_one_lwp): Get rid of a pending SIGSTOP with SIGCONT.
	Pass on pending signals to PTRACE_DETACH.  Check the result of the
	ptrace call.
	* server.c (program_signals, program_signals_p): New.
	(handle_general_set): Handle QProgramSignals.
	* server.h (program_signals, program_signals_p): Declare.

	gdb/
	* NEWS: Mention QProgramSignals.
	* inferior.h (update_signals_program_target): Declare.
	* infrun.c: (update_signals_program_target): New.
	(handle_command): Update the target of the new program signals
	array changes.
	* remote.c (PACKET_QProgramSignals): New enum.
	(last_program_signals_packet): New global.
	(remote_program_signals): New.
	(remote_start_remote): Update the target with the program signals
	list.
	(remote_protocol_features): Add entry for QPassSignals.
	(remote_open_1): Free anc clear last_program_signals_packet.
	(init_remote_ops): Install remote_program_signals.
	* target.c (update_current_target): Adjust.
	(target_program_signals): New.
	* target.h (struct target_ops) <to_program_signals>: New field.
	(target_program_signals): Declare.

1 files changed, 20 insertions, 0 deletions

diff --git a/gdb/target.h b/gdb/target.h
index ed2bcdd81a7..50a0ea6c35c 100644
--- a/gdb/target.h
+++ b/gdb/target.h
@@ -511,6 +511,10 @@ struct target_ops
        target_* macro.  */
     void (*to_pass_signals) (int, unsigned char *);
 
+    /* Documentation of this routine is provided with the
+       corresponding target_* function.  */
+    void (*to_program_signals) (int, unsigned char *);
+
     int (*to_thread_alive) (struct target_ops *, ptid_t ptid);
     void (*to_find_new_threads) (struct target_ops *);
     char *(*to_pid_to_str) (struct target_ops *, ptid_t);
@@ -1261,6 +1265,22 @@ void target_mourn_inferior (void);
 
 extern void target_pass_signals (int nsig, unsigned char *pass_signals);
 
+/* Set list of signals the target may pass to the inferior.  This
+   directly maps to the "handle SIGNAL pass/nopass" setting.
+
+   PROGRAM_SIGNALS is an array of size NSIG, indexed by target signal
+   number (enum target_signal).  For every signal whose entry in this
+   array is non-zero, the target is allowed to pass the signal to the
+   inferior.  Signals not present in the array shall be silently
+   discarded.  This does not influence whether to pass signals to the
+   inferior as a result of a target_resume call.  This is useful in
+   scenarios where the target needs to decide whether to pass or not a
+   signal to the inferior without GDB core involvement, such as for
+   example, when detaching (as threads may have been suspended with
+   pending signals not reported to GDB).  */
+
+extern void target_program_signals (int nsig, unsigned char *program_signals);
+
 /* Check to see if a thread is still alive.  */
 
 extern int target_thread_alive (ptid_t ptid);