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.

2 files changed, 53 insertions, 0 deletions

diff --git a/gdb/doc/ChangeLog b/gdb/doc/ChangeLog
index 3c7357a..20f2816 100644
--- a/gdb/doc/ChangeLog
+++ b/gdb/doc/ChangeLog
@@ -1,3 +1,10 @@
+2012-03-07  Pedro Alves  <palves@redhat.com>
+
+	* gdb.texinfo (General Query Packets): Document new
+	QProgramSignals packet.
+	* gdb.texinfo (Remote configuration): Mention
+	"program-signals-packet".
+
 2012-03-05  Tristan Gingold  <gingold@adacore.com>
 
 	* gdb.texinfo (General Query Packets): Document xfer:uib:read.
diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index 945b68d..e8bbded 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -17514,6 +17514,10 @@ are:
 @tab @code{QPassSignals}
 @tab @code{handle @var{signal}}
 
+@item @code{program-signals}
+@tab @code{QProgramSignals}
+@tab @code{handle @var{signal}}
+
 @item @code{hostio-close-packet}
 @tab @code{vFile:close}
 @tab @code{remote get}, @code{remote put}
@@ -34974,6 +34978,48 @@ command (@pxref{Remote Configuration, set remote pass-signals}).
 This packet is not probed by default; the remote stub must request it,
 by supplying an appropriate @samp{qSupported} response (@pxref{qSupported}).
 
+@item QProgramSignals: @var{signal} @r{[};@var{signal}@r{]}@dots{}
+@cindex signals the inferior may see, remote request
+@cindex @samp{QProgramSignals} packet
+@anchor{QProgramSignals}
+Each listed @var{signal} may be delivered to the inferior process.
+Others should be silently discarded.
+
+In some cases, the remote stub may need to decide whether to deliver a
+signal to the program or not without @value{GDBN} involvement.  One
+example of that is while detaching --- the program's threads may have
+stopped for signals that haven't yet had a chance of being reported to
+@value{GDBN}, and so the remote stub can use the signal list specified
+by this packet to know whether to deliver or ignore those pending
+signals.
+
+This does not influence whether to deliver a signal as requested by a
+resumption packet (@pxref{vCont packet}).
+
+Signals are numbered identically to continue packets and stop replies
+(@pxref{Stop Reply Packets}).  Each @var{signal} list item should be
+strictly greater than the previous item.  Multiple
+@samp{QProgramSignals} packets do not combine; any earlier
+@samp{QProgramSignals} list is completely replaced by the new list.
+
+Reply:
+@table @samp
+@item OK
+The request succeeded.
+
+@item E @var{nn}
+An error occurred.  @var{nn} are hex digits.
+
+@item
+An empty reply indicates that @samp{QProgramSignals} is not supported
+by the stub.
+@end table
+
+Use of this packet is controlled by the @code{set remote program-signals}
+command (@pxref{Remote Configuration, set remote program-signals}).
+This packet is not probed by default; the remote stub must request it,
+by supplying an appropriate @samp{qSupported} response (@pxref{qSupported}).
+
 @item qRcmd,@var{command}
 @cindex execute remote command, remote request
 @cindex @samp{qRcmd} packet