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/* Remote notification in GDB protocol
Copyright (C) 1988-2021 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef REMOTE_NOTIF_H
#define REMOTE_NOTIF_H
#include <list>
#include <memory>
/* An event of a type of async remote notification. */
struct notif_event
{
virtual ~notif_event ()
{
}
};
/* A unique pointer holding a notif_event. */
typedef std::unique_ptr<notif_event> notif_event_up;
/* ID of the notif_client. */
enum REMOTE_NOTIF_ID
{
REMOTE_NOTIF_STOP = 0,
REMOTE_NOTIF_LAST,
};
struct remote_target;
/* A client to a sort of async remote notification. */
struct notif_client
{
/* The name of notification packet. */
const char *name;
/* The packet to acknowledge a previous reply. */
const char *ack_command;
/* Parse BUF to get the expected event and update EVENT. This
function may throw exception if contents in BUF is not the
expected event. */
void (*parse) (remote_target *remote,
struct notif_client *self, const char *buf,
struct notif_event *event);
/* Send field <ack_command> to remote, and do some checking. If
something wrong, throw an exception. */
void (*ack) (remote_target *remote,
struct notif_client *self, const char *buf,
struct notif_event *event);
/* Check this notification client can get pending events in
'remote_notif_process'. */
int (*can_get_pending_events) (remote_target *remote,
struct notif_client *self);
/* Allocate an event. */
notif_event_up (*alloc_event) ();
/* Id of this notif_client. */
const enum REMOTE_NOTIF_ID id;
};
/* State on remote async notification. */
struct remote_notif_state
{
remote_notif_state () = default;
~remote_notif_state ();
DISABLE_COPY_AND_ASSIGN (remote_notif_state);
/* The remote target. */
remote_target *remote;
/* Notification queue. */
std::list<notif_client *> notif_queue;
/* Asynchronous signal handle registered as event loop source for when
the remote sent us a notification. The registered callback
will do a ACK sequence to pull the rest of the events out of
the remote side into our event queue. */
struct async_event_handler *get_pending_events_token;
/* One pending event for each notification client. This is where we
keep it until it is acknowledged. When there is a notification
packet, parse it, and create an object of 'struct notif_event' to
assign to it. This field is unchanged until GDB starts to ack
this notification (which is done by
remote.c:remote_notif_pending_replies). */
struct notif_event *pending_event[REMOTE_NOTIF_LAST] {};
};
void remote_notif_ack (remote_target *remote, notif_client *nc,
const char *buf);
struct notif_event *remote_notif_parse (remote_target *remote,
notif_client *nc,
const char *buf);
void handle_notification (struct remote_notif_state *notif_state,
const char *buf);
void remote_notif_process (struct remote_notif_state *state,
struct notif_client *except);
remote_notif_state *remote_notif_state_allocate (remote_target *remote);
extern struct notif_client notif_client_stop;
extern bool notif_debug;
#endif /* REMOTE_NOTIF_H */
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