/* Event loop machinery for GDB, the GNU debugger.
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/* Event loop machinery for GDB, the GNU debugger.
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Copyright (C) 1999, 2000, 2001, 2002, 2005, 2006, 2007, 2008, 2009, 2010
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Copyright (C) 1999, 2000, 2001, 2002, 2005, 2006, 2007, 2008, 2009, 2010
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Free Software Foundation, Inc.
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Free Software Foundation, Inc.
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Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
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Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
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This file is part of GDB.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "defs.h"
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#include "event-loop.h"
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#include "event-loop.h"
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#include "event-top.h"
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#include "event-top.h"
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#ifdef HAVE_POLL
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#ifdef HAVE_POLL
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#if defined (HAVE_POLL_H)
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#if defined (HAVE_POLL_H)
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#include <poll.h>
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#include <poll.h>
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#elif defined (HAVE_SYS_POLL_H)
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#elif defined (HAVE_SYS_POLL_H)
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#include <sys/poll.h>
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#include <sys/poll.h>
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#endif
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#endif
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#endif
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#endif
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#include <sys/types.h>
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#include <sys/types.h>
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#include "gdb_string.h"
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#include "gdb_string.h"
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#include <errno.h>
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#include <errno.h>
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#include <sys/time.h>
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#include <sys/time.h>
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#include "exceptions.h"
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#include "exceptions.h"
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#include "gdb_assert.h"
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#include "gdb_assert.h"
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#include "gdb_select.h"
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#include "gdb_select.h"
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/* Data point to pass to the event handler. */
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/* Data point to pass to the event handler. */
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typedef union event_data
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typedef union event_data
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{
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{
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void *ptr;
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void *ptr;
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int integer;
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int integer;
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} event_data;
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} event_data;
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typedef struct gdb_event gdb_event;
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typedef struct gdb_event gdb_event;
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typedef void (event_handler_func) (event_data);
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typedef void (event_handler_func) (event_data);
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/* Event for the GDB event system. Events are queued by calling
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/* Event for the GDB event system. Events are queued by calling
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async_queue_event and serviced later on by gdb_do_one_event. An
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async_queue_event and serviced later on by gdb_do_one_event. An
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event can be, for instance, a file descriptor becoming ready to be
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event can be, for instance, a file descriptor becoming ready to be
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read. Servicing an event simply means that the procedure PROC will
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read. Servicing an event simply means that the procedure PROC will
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be called. We have 2 queues, one for file handlers that we listen
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be called. We have 2 queues, one for file handlers that we listen
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to in the event loop, and one for the file handlers+events that are
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to in the event loop, and one for the file handlers+events that are
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ready. The procedure PROC associated with each event is dependant
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ready. The procedure PROC associated with each event is dependant
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of the event source. In the case of monitored file descriptors, it
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of the event source. In the case of monitored file descriptors, it
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is always the same (handle_file_event). Its duty is to invoke the
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is always the same (handle_file_event). Its duty is to invoke the
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handler associated with the file descriptor whose state change
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handler associated with the file descriptor whose state change
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generated the event, plus doing other cleanups and such. In the
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generated the event, plus doing other cleanups and such. In the
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case of async signal handlers, it is
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case of async signal handlers, it is
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invoke_async_signal_handler. */
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invoke_async_signal_handler. */
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struct gdb_event
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struct gdb_event
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{
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{
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/* Procedure to call to service this event. */
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/* Procedure to call to service this event. */
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event_handler_func *proc;
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event_handler_func *proc;
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/* Data to pass to the event handler. */
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/* Data to pass to the event handler. */
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event_data data;
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event_data data;
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/* Next in list of events or NULL. */
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/* Next in list of events or NULL. */
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struct gdb_event *next_event;
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struct gdb_event *next_event;
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};
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};
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/* Information about each file descriptor we register with the event
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/* Information about each file descriptor we register with the event
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loop. */
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loop. */
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typedef struct file_handler
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typedef struct file_handler
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{
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{
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int fd; /* File descriptor. */
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int fd; /* File descriptor. */
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int mask; /* Events we want to monitor: POLLIN, etc. */
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int mask; /* Events we want to monitor: POLLIN, etc. */
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int ready_mask; /* Events that have been seen since
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int ready_mask; /* Events that have been seen since
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the last time. */
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the last time. */
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handler_func *proc; /* Procedure to call when fd is ready. */
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handler_func *proc; /* Procedure to call when fd is ready. */
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gdb_client_data client_data; /* Argument to pass to proc. */
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gdb_client_data client_data; /* Argument to pass to proc. */
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int error; /* Was an error detected on this fd? */
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int error; /* Was an error detected on this fd? */
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struct file_handler *next_file; /* Next registered file descriptor. */
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struct file_handler *next_file; /* Next registered file descriptor. */
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}
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}
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file_handler;
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file_handler;
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/* PROC is a function to be invoked when the READY flag is set. This
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/* PROC is a function to be invoked when the READY flag is set. This
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happens when there has been a signal and the corresponding signal
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happens when there has been a signal and the corresponding signal
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handler has 'triggered' this async_signal_handler for
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handler has 'triggered' this async_signal_handler for
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execution. The actual work to be done in response to a signal will
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execution. The actual work to be done in response to a signal will
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be carried out by PROC at a later time, within process_event. This
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be carried out by PROC at a later time, within process_event. This
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provides a deferred execution of signal handlers.
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provides a deferred execution of signal handlers.
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Async_init_signals takes care of setting up such an
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Async_init_signals takes care of setting up such an
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async_signal_handler for each interesting signal. */
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async_signal_handler for each interesting signal. */
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typedef struct async_signal_handler
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typedef struct async_signal_handler
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{
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{
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int ready; /* If ready, call this handler from the main event loop,
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int ready; /* If ready, call this handler from the main event loop,
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using invoke_async_handler. */
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using invoke_async_handler. */
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struct async_signal_handler *next_handler; /* Ptr to next handler */
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struct async_signal_handler *next_handler; /* Ptr to next handler */
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sig_handler_func *proc; /* Function to call to do the work */
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sig_handler_func *proc; /* Function to call to do the work */
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gdb_client_data client_data; /* Argument to async_handler_func */
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gdb_client_data client_data; /* Argument to async_handler_func */
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}
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}
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async_signal_handler;
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async_signal_handler;
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/* PROC is a function to be invoked when the READY flag is set. This
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/* PROC is a function to be invoked when the READY flag is set. This
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happens when the event has been marked with
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happens when the event has been marked with
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MARK_ASYNC_EVENT_HANDLER. The actual work to be done in response
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MARK_ASYNC_EVENT_HANDLER. The actual work to be done in response
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to an event will be carried out by PROC at a later time, within
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to an event will be carried out by PROC at a later time, within
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process_event. This provides a deferred execution of event
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process_event. This provides a deferred execution of event
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handlers. */
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handlers. */
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typedef struct async_event_handler
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typedef struct async_event_handler
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{
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{
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/* If ready, call this handler from the main event loop, using
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/* If ready, call this handler from the main event loop, using
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invoke_event_handler. */
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invoke_event_handler. */
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int ready;
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int ready;
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/* Point to next handler. */
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/* Point to next handler. */
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struct async_event_handler *next_handler;
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struct async_event_handler *next_handler;
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/* Function to call to do the work. */
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/* Function to call to do the work. */
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async_event_handler_func *proc;
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async_event_handler_func *proc;
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/* Argument to PROC. */
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/* Argument to PROC. */
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gdb_client_data client_data;
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gdb_client_data client_data;
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}
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}
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async_event_handler;
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async_event_handler;
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/* Event queue:
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/* Event queue:
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- the first event in the queue is the head of the queue.
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- the first event in the queue is the head of the queue.
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It will be the next to be serviced.
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It will be the next to be serviced.
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- the last event in the queue
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- the last event in the queue
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Events can be inserted at the front of the queue or at the end of
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Events can be inserted at the front of the queue or at the end of
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the queue. Events will be extracted from the queue for processing
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the queue. Events will be extracted from the queue for processing
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starting from the head. Therefore, events inserted at the head of
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starting from the head. Therefore, events inserted at the head of
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the queue will be processed in a last in first out fashion, while
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the queue will be processed in a last in first out fashion, while
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those inserted at the tail of the queue will be processed in a first
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those inserted at the tail of the queue will be processed in a first
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in first out manner. All the fields are NULL if the queue is
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in first out manner. All the fields are NULL if the queue is
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empty. */
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empty. */
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static struct
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static struct
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{
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{
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gdb_event *first_event; /* First pending event */
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gdb_event *first_event; /* First pending event */
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gdb_event *last_event; /* Last pending event */
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gdb_event *last_event; /* Last pending event */
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}
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}
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event_queue;
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event_queue;
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/* Gdb_notifier is just a list of file descriptors gdb is interested in.
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/* Gdb_notifier is just a list of file descriptors gdb is interested in.
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These are the input file descriptor, and the target file
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These are the input file descriptor, and the target file
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descriptor. We have two flavors of the notifier, one for platforms
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descriptor. We have two flavors of the notifier, one for platforms
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that have the POLL function, the other for those that don't, and
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that have the POLL function, the other for those that don't, and
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only support SELECT. Each of the elements in the gdb_notifier list is
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only support SELECT. Each of the elements in the gdb_notifier list is
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basically a description of what kind of events gdb is interested
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basically a description of what kind of events gdb is interested
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in, for each fd. */
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in, for each fd. */
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/* As of 1999-04-30 only the input file descriptor is registered with the
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/* As of 1999-04-30 only the input file descriptor is registered with the
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event loop. */
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event loop. */
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/* Do we use poll or select ? */
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/* Do we use poll or select ? */
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#ifdef HAVE_POLL
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#ifdef HAVE_POLL
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#define USE_POLL 1
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#define USE_POLL 1
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#else
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#else
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#define USE_POLL 0
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#define USE_POLL 0
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#endif /* HAVE_POLL */
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#endif /* HAVE_POLL */
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static unsigned char use_poll = USE_POLL;
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static unsigned char use_poll = USE_POLL;
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#ifdef USE_WIN32API
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#ifdef USE_WIN32API
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#include <windows.h>
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#include <windows.h>
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#include <io.h>
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#include <io.h>
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#endif
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#endif
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static struct
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static struct
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{
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{
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/* Ptr to head of file handler list. */
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/* Ptr to head of file handler list. */
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file_handler *first_file_handler;
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file_handler *first_file_handler;
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#ifdef HAVE_POLL
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#ifdef HAVE_POLL
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/* Ptr to array of pollfd structures. */
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/* Ptr to array of pollfd structures. */
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struct pollfd *poll_fds;
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struct pollfd *poll_fds;
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/* Timeout in milliseconds for calls to poll(). */
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/* Timeout in milliseconds for calls to poll(). */
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int poll_timeout;
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int poll_timeout;
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#endif
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#endif
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/* Masks to be used in the next call to select.
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/* Masks to be used in the next call to select.
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Bits are set in response to calls to create_file_handler. */
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Bits are set in response to calls to create_file_handler. */
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fd_set check_masks[3];
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fd_set check_masks[3];
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/* What file descriptors were found ready by select. */
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/* What file descriptors were found ready by select. */
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fd_set ready_masks[3];
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fd_set ready_masks[3];
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/* Number of file descriptors to monitor. (for poll) */
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/* Number of file descriptors to monitor. (for poll) */
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/* Number of valid bits (highest fd value + 1). (for select) */
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/* Number of valid bits (highest fd value + 1). (for select) */
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int num_fds;
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int num_fds;
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/* Time structure for calls to select(). */
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/* Time structure for calls to select(). */
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struct timeval select_timeout;
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struct timeval select_timeout;
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/* Flag to tell whether the timeout should be used. */
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/* Flag to tell whether the timeout should be used. */
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int timeout_valid;
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int timeout_valid;
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}
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}
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gdb_notifier;
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gdb_notifier;
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/* Structure associated with a timer. PROC will be executed at the
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/* Structure associated with a timer. PROC will be executed at the
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first occasion after WHEN. */
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first occasion after WHEN. */
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struct gdb_timer
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struct gdb_timer
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{
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{
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struct timeval when;
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struct timeval when;
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int timer_id;
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int timer_id;
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struct gdb_timer *next;
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struct gdb_timer *next;
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timer_handler_func *proc; /* Function to call to do the work */
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timer_handler_func *proc; /* Function to call to do the work */
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gdb_client_data client_data; /* Argument to async_handler_func */
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gdb_client_data client_data; /* Argument to async_handler_func */
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}
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}
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gdb_timer;
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gdb_timer;
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/* List of currently active timers. It is sorted in order of
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/* List of currently active timers. It is sorted in order of
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increasing timers. */
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increasing timers. */
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static struct
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static struct
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{
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{
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/* Pointer to first in timer list. */
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/* Pointer to first in timer list. */
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struct gdb_timer *first_timer;
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struct gdb_timer *first_timer;
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/* Id of the last timer created. */
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/* Id of the last timer created. */
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int num_timers;
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int num_timers;
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}
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}
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timer_list;
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timer_list;
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/* All the async_signal_handlers gdb is interested in are kept onto
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/* All the async_signal_handlers gdb is interested in are kept onto
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this list. */
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this list. */
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static struct
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static struct
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{
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{
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/* Pointer to first in handler list. */
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/* Pointer to first in handler list. */
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async_signal_handler *first_handler;
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async_signal_handler *first_handler;
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/* Pointer to last in handler list. */
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/* Pointer to last in handler list. */
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async_signal_handler *last_handler;
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async_signal_handler *last_handler;
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}
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}
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sighandler_list;
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sighandler_list;
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/* All the async_event_handlers gdb is interested in are kept onto
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/* All the async_event_handlers gdb is interested in are kept onto
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this list. */
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this list. */
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static struct
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static struct
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{
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{
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/* Pointer to first in handler list. */
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/* Pointer to first in handler list. */
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async_event_handler *first_handler;
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async_event_handler *first_handler;
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/* Pointer to last in handler list. */
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/* Pointer to last in handler list. */
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async_event_handler *last_handler;
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async_event_handler *last_handler;
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}
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}
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async_event_handler_list;
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async_event_handler_list;
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static int invoke_async_signal_handlers (void);
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static int invoke_async_signal_handlers (void);
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static void create_file_handler (int fd, int mask, handler_func *proc,
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static void create_file_handler (int fd, int mask, handler_func *proc,
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gdb_client_data client_data);
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gdb_client_data client_data);
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static void handle_file_event (event_data data);
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static void handle_file_event (event_data data);
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static void check_async_event_handlers (void);
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static void check_async_event_handlers (void);
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static int gdb_wait_for_event (int);
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static int gdb_wait_for_event (int);
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static void poll_timers (void);
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static void poll_timers (void);
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/* Insert an event object into the gdb event queue at
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/* Insert an event object into the gdb event queue at
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the specified position.
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the specified position.
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POSITION can be head or tail, with values TAIL, HEAD.
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POSITION can be head or tail, with values TAIL, HEAD.
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EVENT_PTR points to the event to be inserted into the queue.
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EVENT_PTR points to the event to be inserted into the queue.
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The caller must allocate memory for the event. It is freed
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The caller must allocate memory for the event. It is freed
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after the event has ben handled.
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after the event has ben handled.
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Events in the queue will be processed head to tail, therefore,
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Events in the queue will be processed head to tail, therefore,
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events inserted at the head of the queue will be processed
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events inserted at the head of the queue will be processed
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as last in first out. Event appended at the tail of the queue
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as last in first out. Event appended at the tail of the queue
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will be processed first in first out. */
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will be processed first in first out. */
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static void
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static void
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async_queue_event (gdb_event * event_ptr, queue_position position)
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async_queue_event (gdb_event * event_ptr, queue_position position)
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{
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{
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if (position == TAIL)
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if (position == TAIL)
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{
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{
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/* The event will become the new last_event. */
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/* The event will become the new last_event. */
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event_ptr->next_event = NULL;
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event_ptr->next_event = NULL;
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if (event_queue.first_event == NULL)
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if (event_queue.first_event == NULL)
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event_queue.first_event = event_ptr;
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event_queue.first_event = event_ptr;
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else
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else
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event_queue.last_event->next_event = event_ptr;
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event_queue.last_event->next_event = event_ptr;
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event_queue.last_event = event_ptr;
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event_queue.last_event = event_ptr;
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}
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}
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else if (position == HEAD)
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else if (position == HEAD)
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{
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{
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/* The event becomes the new first_event. */
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/* The event becomes the new first_event. */
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event_ptr->next_event = event_queue.first_event;
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event_ptr->next_event = event_queue.first_event;
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if (event_queue.first_event == NULL)
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if (event_queue.first_event == NULL)
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event_queue.last_event = event_ptr;
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event_queue.last_event = event_ptr;
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event_queue.first_event = event_ptr;
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event_queue.first_event = event_ptr;
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}
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}
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}
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}
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/* Create a generic event, to be enqueued in the event queue for
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/* Create a generic event, to be enqueued in the event queue for
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processing. PROC is the procedure associated to the event. DATA
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processing. PROC is the procedure associated to the event. DATA
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is passed to PROC upon PROC invocation. */
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is passed to PROC upon PROC invocation. */
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static gdb_event *
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static gdb_event *
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create_event (event_handler_func proc, event_data data)
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create_event (event_handler_func proc, event_data data)
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{
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{
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gdb_event *event;
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gdb_event *event;
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event = xmalloc (sizeof (*event));
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event = xmalloc (sizeof (*event));
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event->proc = proc;
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event->proc = proc;
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event->data = data;
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event->data = data;
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return event;
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return event;
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}
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}
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/* Create a file event, to be enqueued in the event queue for
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/* Create a file event, to be enqueued in the event queue for
|
processing. The procedure associated to this event is always
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processing. The procedure associated to this event is always
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handle_file_event, which will in turn invoke the one that was
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handle_file_event, which will in turn invoke the one that was
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associated to FD when it was registered with the event loop. */
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associated to FD when it was registered with the event loop. */
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static gdb_event *
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static gdb_event *
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create_file_event (int fd)
|
create_file_event (int fd)
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{
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{
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event_data data;
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event_data data;
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|
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data.integer = fd;
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data.integer = fd;
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return create_event (handle_file_event, data);
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return create_event (handle_file_event, data);
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}
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}
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/* Process one event.
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/* Process one event.
|
The event can be the next one to be serviced in the event queue,
|
The event can be the next one to be serviced in the event queue,
|
or an asynchronous event handler can be invoked in response to
|
or an asynchronous event handler can be invoked in response to
|
the reception of a signal.
|
the reception of a signal.
|
If an event was processed (either way), 1 is returned otherwise
|
If an event was processed (either way), 1 is returned otherwise
|
0 is returned.
|
0 is returned.
|
Scan the queue from head to tail, processing therefore the high
|
Scan the queue from head to tail, processing therefore the high
|
priority events first, by invoking the associated event handler
|
priority events first, by invoking the associated event handler
|
procedure. */
|
procedure. */
|
static int
|
static int
|
process_event (void)
|
process_event (void)
|
{
|
{
|
gdb_event *event_ptr, *prev_ptr;
|
gdb_event *event_ptr, *prev_ptr;
|
event_handler_func *proc;
|
event_handler_func *proc;
|
event_data data;
|
event_data data;
|
|
|
/* First let's see if there are any asynchronous event handlers that
|
/* First let's see if there are any asynchronous event handlers that
|
are ready. These would be the result of invoking any of the
|
are ready. These would be the result of invoking any of the
|
signal handlers. */
|
signal handlers. */
|
|
|
if (invoke_async_signal_handlers ())
|
if (invoke_async_signal_handlers ())
|
return 1;
|
return 1;
|
|
|
/* Look in the event queue to find an event that is ready
|
/* Look in the event queue to find an event that is ready
|
to be processed. */
|
to be processed. */
|
|
|
for (event_ptr = event_queue.first_event; event_ptr != NULL;
|
for (event_ptr = event_queue.first_event; event_ptr != NULL;
|
event_ptr = event_ptr->next_event)
|
event_ptr = event_ptr->next_event)
|
{
|
{
|
/* Call the handler for the event. */
|
/* Call the handler for the event. */
|
|
|
proc = event_ptr->proc;
|
proc = event_ptr->proc;
|
data = event_ptr->data;
|
data = event_ptr->data;
|
|
|
/* Let's get rid of the event from the event queue. We need to
|
/* Let's get rid of the event from the event queue. We need to
|
do this now because while processing the event, the proc
|
do this now because while processing the event, the proc
|
function could end up calling 'error' and therefore jump out
|
function could end up calling 'error' and therefore jump out
|
to the caller of this function, gdb_do_one_event. In that
|
to the caller of this function, gdb_do_one_event. In that
|
case, we would have on the event queue an event wich has been
|
case, we would have on the event queue an event wich has been
|
processed, but not deleted. */
|
processed, but not deleted. */
|
|
|
if (event_queue.first_event == event_ptr)
|
if (event_queue.first_event == event_ptr)
|
{
|
{
|
event_queue.first_event = event_ptr->next_event;
|
event_queue.first_event = event_ptr->next_event;
|
if (event_ptr->next_event == NULL)
|
if (event_ptr->next_event == NULL)
|
event_queue.last_event = NULL;
|
event_queue.last_event = NULL;
|
}
|
}
|
else
|
else
|
{
|
{
|
prev_ptr = event_queue.first_event;
|
prev_ptr = event_queue.first_event;
|
while (prev_ptr->next_event != event_ptr)
|
while (prev_ptr->next_event != event_ptr)
|
prev_ptr = prev_ptr->next_event;
|
prev_ptr = prev_ptr->next_event;
|
|
|
prev_ptr->next_event = event_ptr->next_event;
|
prev_ptr->next_event = event_ptr->next_event;
|
if (event_ptr->next_event == NULL)
|
if (event_ptr->next_event == NULL)
|
event_queue.last_event = prev_ptr;
|
event_queue.last_event = prev_ptr;
|
}
|
}
|
xfree (event_ptr);
|
xfree (event_ptr);
|
|
|
/* Now call the procedure associated with the event. */
|
/* Now call the procedure associated with the event. */
|
(*proc) (data);
|
(*proc) (data);
|
return 1;
|
return 1;
|
}
|
}
|
|
|
/* this is the case if there are no event on the event queue. */
|
/* this is the case if there are no event on the event queue. */
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Process one high level event. If nothing is ready at this time,
|
/* Process one high level event. If nothing is ready at this time,
|
wait for something to happen (via gdb_wait_for_event), then process
|
wait for something to happen (via gdb_wait_for_event), then process
|
it. Returns >0 if something was done otherwise returns <0 (this
|
it. Returns >0 if something was done otherwise returns <0 (this
|
can happen if there are no event sources to wait for). If an error
|
can happen if there are no event sources to wait for). If an error
|
occurs catch_errors() which calls this function returns zero. */
|
occurs catch_errors() which calls this function returns zero. */
|
|
|
int
|
int
|
gdb_do_one_event (void *data)
|
gdb_do_one_event (void *data)
|
{
|
{
|
static int event_source_head = 0;
|
static int event_source_head = 0;
|
const int number_of_sources = 3;
|
const int number_of_sources = 3;
|
int current = 0;
|
int current = 0;
|
|
|
/* Any events already waiting in the queue? */
|
/* Any events already waiting in the queue? */
|
if (process_event ())
|
if (process_event ())
|
return 1;
|
return 1;
|
|
|
/* To level the fairness across event sources, we poll them in a
|
/* To level the fairness across event sources, we poll them in a
|
round-robin fashion. */
|
round-robin fashion. */
|
for (current = 0; current < number_of_sources; current++)
|
for (current = 0; current < number_of_sources; current++)
|
{
|
{
|
switch (event_source_head)
|
switch (event_source_head)
|
{
|
{
|
case 0:
|
case 0:
|
/* Are any timers that are ready? If so, put an event on the
|
/* Are any timers that are ready? If so, put an event on the
|
queue. */
|
queue. */
|
poll_timers ();
|
poll_timers ();
|
break;
|
break;
|
case 1:
|
case 1:
|
/* Are there events already waiting to be collected on the
|
/* Are there events already waiting to be collected on the
|
monitored file descriptors? */
|
monitored file descriptors? */
|
gdb_wait_for_event (0);
|
gdb_wait_for_event (0);
|
break;
|
break;
|
case 2:
|
case 2:
|
/* Are there any asynchronous event handlers ready? */
|
/* Are there any asynchronous event handlers ready? */
|
check_async_event_handlers ();
|
check_async_event_handlers ();
|
break;
|
break;
|
}
|
}
|
|
|
event_source_head++;
|
event_source_head++;
|
if (event_source_head == number_of_sources)
|
if (event_source_head == number_of_sources)
|
event_source_head = 0;
|
event_source_head = 0;
|
}
|
}
|
|
|
/* Handle any new events collected. */
|
/* Handle any new events collected. */
|
if (process_event ())
|
if (process_event ())
|
return 1;
|
return 1;
|
|
|
/* Block waiting for a new event. If gdb_wait_for_event returns -1,
|
/* Block waiting for a new event. If gdb_wait_for_event returns -1,
|
we should get out because this means that there are no event
|
we should get out because this means that there are no event
|
sources left. This will make the event loop stop, and the
|
sources left. This will make the event loop stop, and the
|
application exit. */
|
application exit. */
|
|
|
if (gdb_wait_for_event (1) < 0)
|
if (gdb_wait_for_event (1) < 0)
|
return -1;
|
return -1;
|
|
|
/* Handle any new events occurred while waiting. */
|
/* Handle any new events occurred while waiting. */
|
if (process_event ())
|
if (process_event ())
|
return 1;
|
return 1;
|
|
|
/* If gdb_wait_for_event has returned 1, it means that one event has
|
/* If gdb_wait_for_event has returned 1, it means that one event has
|
been handled. We break out of the loop. */
|
been handled. We break out of the loop. */
|
return 1;
|
return 1;
|
}
|
}
|
|
|
/* Start up the event loop. This is the entry point to the event loop
|
/* Start up the event loop. This is the entry point to the event loop
|
from the command loop. */
|
from the command loop. */
|
|
|
void
|
void
|
start_event_loop (void)
|
start_event_loop (void)
|
{
|
{
|
/* Loop until there is nothing to do. This is the entry point to the
|
/* Loop until there is nothing to do. This is the entry point to the
|
event loop engine. gdb_do_one_event, called via catch_errors()
|
event loop engine. gdb_do_one_event, called via catch_errors()
|
will process one event for each invocation. It blocks waits for
|
will process one event for each invocation. It blocks waits for
|
an event and then processes it. >0 when an event is processed, 0
|
an event and then processes it. >0 when an event is processed, 0
|
when catch_errors() caught an error and <0 when there are no
|
when catch_errors() caught an error and <0 when there are no
|
longer any event sources registered. */
|
longer any event sources registered. */
|
while (1)
|
while (1)
|
{
|
{
|
int gdb_result;
|
int gdb_result;
|
|
|
gdb_result = catch_errors (gdb_do_one_event, 0, "", RETURN_MASK_ALL);
|
gdb_result = catch_errors (gdb_do_one_event, 0, "", RETURN_MASK_ALL);
|
if (gdb_result < 0)
|
if (gdb_result < 0)
|
break;
|
break;
|
|
|
/* If we long-jumped out of do_one_event, we probably
|
/* If we long-jumped out of do_one_event, we probably
|
didn't get around to resetting the prompt, which leaves
|
didn't get around to resetting the prompt, which leaves
|
readline in a messed-up state. Reset it here. */
|
readline in a messed-up state. Reset it here. */
|
|
|
if (gdb_result == 0)
|
if (gdb_result == 0)
|
{
|
{
|
/* If any exception escaped to here, we better enable
|
/* If any exception escaped to here, we better enable
|
stdin. Otherwise, any command that calls async_disable_stdin,
|
stdin. Otherwise, any command that calls async_disable_stdin,
|
and then throws, will leave stdin inoperable. */
|
and then throws, will leave stdin inoperable. */
|
async_enable_stdin ();
|
async_enable_stdin ();
|
/* FIXME: this should really be a call to a hook that is
|
/* FIXME: this should really be a call to a hook that is
|
interface specific, because interfaces can display the
|
interface specific, because interfaces can display the
|
prompt in their own way. */
|
prompt in their own way. */
|
display_gdb_prompt (0);
|
display_gdb_prompt (0);
|
/* This call looks bizarre, but it is required. If the user
|
/* This call looks bizarre, but it is required. If the user
|
entered a command that caused an error,
|
entered a command that caused an error,
|
after_char_processing_hook won't be called from
|
after_char_processing_hook won't be called from
|
rl_callback_read_char_wrapper. Using a cleanup there
|
rl_callback_read_char_wrapper. Using a cleanup there
|
won't work, since we want this function to be called
|
won't work, since we want this function to be called
|
after a new prompt is printed. */
|
after a new prompt is printed. */
|
if (after_char_processing_hook)
|
if (after_char_processing_hook)
|
(*after_char_processing_hook) ();
|
(*after_char_processing_hook) ();
|
/* Maybe better to set a flag to be checked somewhere as to
|
/* Maybe better to set a flag to be checked somewhere as to
|
whether display the prompt or not. */
|
whether display the prompt or not. */
|
}
|
}
|
}
|
}
|
|
|
/* We are done with the event loop. There are no more event sources
|
/* We are done with the event loop. There are no more event sources
|
to listen to. So we exit GDB. */
|
to listen to. So we exit GDB. */
|
return;
|
return;
|
}
|
}
|
|
|
|
|
/* Wrapper function for create_file_handler, so that the caller
|
/* Wrapper function for create_file_handler, so that the caller
|
doesn't have to know implementation details about the use of poll
|
doesn't have to know implementation details about the use of poll
|
vs. select. */
|
vs. select. */
|
void
|
void
|
add_file_handler (int fd, handler_func * proc, gdb_client_data client_data)
|
add_file_handler (int fd, handler_func * proc, gdb_client_data client_data)
|
{
|
{
|
#ifdef HAVE_POLL
|
#ifdef HAVE_POLL
|
struct pollfd fds;
|
struct pollfd fds;
|
#endif
|
#endif
|
|
|
if (use_poll)
|
if (use_poll)
|
{
|
{
|
#ifdef HAVE_POLL
|
#ifdef HAVE_POLL
|
/* Check to see if poll () is usable. If not, we'll switch to
|
/* Check to see if poll () is usable. If not, we'll switch to
|
use select. This can happen on systems like
|
use select. This can happen on systems like
|
m68k-motorola-sys, `poll' cannot be used to wait for `stdin'.
|
m68k-motorola-sys, `poll' cannot be used to wait for `stdin'.
|
On m68k-motorola-sysv, tty's are not stream-based and not
|
On m68k-motorola-sysv, tty's are not stream-based and not
|
`poll'able. */
|
`poll'able. */
|
fds.fd = fd;
|
fds.fd = fd;
|
fds.events = POLLIN;
|
fds.events = POLLIN;
|
if (poll (&fds, 1, 0) == 1 && (fds.revents & POLLNVAL))
|
if (poll (&fds, 1, 0) == 1 && (fds.revents & POLLNVAL))
|
use_poll = 0;
|
use_poll = 0;
|
#else
|
#else
|
internal_error (__FILE__, __LINE__,
|
internal_error (__FILE__, __LINE__,
|
_("use_poll without HAVE_POLL"));
|
_("use_poll without HAVE_POLL"));
|
#endif /* HAVE_POLL */
|
#endif /* HAVE_POLL */
|
}
|
}
|
if (use_poll)
|
if (use_poll)
|
{
|
{
|
#ifdef HAVE_POLL
|
#ifdef HAVE_POLL
|
create_file_handler (fd, POLLIN, proc, client_data);
|
create_file_handler (fd, POLLIN, proc, client_data);
|
#else
|
#else
|
internal_error (__FILE__, __LINE__,
|
internal_error (__FILE__, __LINE__,
|
_("use_poll without HAVE_POLL"));
|
_("use_poll without HAVE_POLL"));
|
#endif
|
#endif
|
}
|
}
|
else
|
else
|
create_file_handler (fd, GDB_READABLE | GDB_EXCEPTION, proc, client_data);
|
create_file_handler (fd, GDB_READABLE | GDB_EXCEPTION, proc, client_data);
|
}
|
}
|
|
|
/* Add a file handler/descriptor to the list of descriptors we are
|
/* Add a file handler/descriptor to the list of descriptors we are
|
interested in.
|
interested in.
|
FD is the file descriptor for the file/stream to be listened to.
|
FD is the file descriptor for the file/stream to be listened to.
|
For the poll case, MASK is a combination (OR) of
|
For the poll case, MASK is a combination (OR) of
|
POLLIN, POLLRDNORM, POLLRDBAND, POLLPRI, POLLOUT, POLLWRNORM,
|
POLLIN, POLLRDNORM, POLLRDBAND, POLLPRI, POLLOUT, POLLWRNORM,
|
POLLWRBAND: these are the events we are interested in. If any of them
|
POLLWRBAND: these are the events we are interested in. If any of them
|
occurs, proc should be called.
|
occurs, proc should be called.
|
For the select case, MASK is a combination of READABLE, WRITABLE, EXCEPTION.
|
For the select case, MASK is a combination of READABLE, WRITABLE, EXCEPTION.
|
PROC is the procedure that will be called when an event occurs for
|
PROC is the procedure that will be called when an event occurs for
|
FD. CLIENT_DATA is the argument to pass to PROC. */
|
FD. CLIENT_DATA is the argument to pass to PROC. */
|
static void
|
static void
|
create_file_handler (int fd, int mask, handler_func * proc, gdb_client_data client_data)
|
create_file_handler (int fd, int mask, handler_func * proc, gdb_client_data client_data)
|
{
|
{
|
file_handler *file_ptr;
|
file_handler *file_ptr;
|
|
|
/* Do we already have a file handler for this file? (We may be
|
/* Do we already have a file handler for this file? (We may be
|
changing its associated procedure). */
|
changing its associated procedure). */
|
for (file_ptr = gdb_notifier.first_file_handler; file_ptr != NULL;
|
for (file_ptr = gdb_notifier.first_file_handler; file_ptr != NULL;
|
file_ptr = file_ptr->next_file)
|
file_ptr = file_ptr->next_file)
|
{
|
{
|
if (file_ptr->fd == fd)
|
if (file_ptr->fd == fd)
|
break;
|
break;
|
}
|
}
|
|
|
/* It is a new file descriptor. Add it to the list. Otherwise, just
|
/* It is a new file descriptor. Add it to the list. Otherwise, just
|
change the data associated with it. */
|
change the data associated with it. */
|
if (file_ptr == NULL)
|
if (file_ptr == NULL)
|
{
|
{
|
file_ptr = (file_handler *) xmalloc (sizeof (file_handler));
|
file_ptr = (file_handler *) xmalloc (sizeof (file_handler));
|
file_ptr->fd = fd;
|
file_ptr->fd = fd;
|
file_ptr->ready_mask = 0;
|
file_ptr->ready_mask = 0;
|
file_ptr->next_file = gdb_notifier.first_file_handler;
|
file_ptr->next_file = gdb_notifier.first_file_handler;
|
gdb_notifier.first_file_handler = file_ptr;
|
gdb_notifier.first_file_handler = file_ptr;
|
|
|
if (use_poll)
|
if (use_poll)
|
{
|
{
|
#ifdef HAVE_POLL
|
#ifdef HAVE_POLL
|
gdb_notifier.num_fds++;
|
gdb_notifier.num_fds++;
|
if (gdb_notifier.poll_fds)
|
if (gdb_notifier.poll_fds)
|
gdb_notifier.poll_fds =
|
gdb_notifier.poll_fds =
|
(struct pollfd *) xrealloc (gdb_notifier.poll_fds,
|
(struct pollfd *) xrealloc (gdb_notifier.poll_fds,
|
(gdb_notifier.num_fds
|
(gdb_notifier.num_fds
|
* sizeof (struct pollfd)));
|
* sizeof (struct pollfd)));
|
else
|
else
|
gdb_notifier.poll_fds =
|
gdb_notifier.poll_fds =
|
(struct pollfd *) xmalloc (sizeof (struct pollfd));
|
(struct pollfd *) xmalloc (sizeof (struct pollfd));
|
(gdb_notifier.poll_fds + gdb_notifier.num_fds - 1)->fd = fd;
|
(gdb_notifier.poll_fds + gdb_notifier.num_fds - 1)->fd = fd;
|
(gdb_notifier.poll_fds + gdb_notifier.num_fds - 1)->events = mask;
|
(gdb_notifier.poll_fds + gdb_notifier.num_fds - 1)->events = mask;
|
(gdb_notifier.poll_fds + gdb_notifier.num_fds - 1)->revents = 0;
|
(gdb_notifier.poll_fds + gdb_notifier.num_fds - 1)->revents = 0;
|
#else
|
#else
|
internal_error (__FILE__, __LINE__,
|
internal_error (__FILE__, __LINE__,
|
_("use_poll without HAVE_POLL"));
|
_("use_poll without HAVE_POLL"));
|
#endif /* HAVE_POLL */
|
#endif /* HAVE_POLL */
|
}
|
}
|
else
|
else
|
{
|
{
|
if (mask & GDB_READABLE)
|
if (mask & GDB_READABLE)
|
FD_SET (fd, &gdb_notifier.check_masks[0]);
|
FD_SET (fd, &gdb_notifier.check_masks[0]);
|
else
|
else
|
FD_CLR (fd, &gdb_notifier.check_masks[0]);
|
FD_CLR (fd, &gdb_notifier.check_masks[0]);
|
|
|
if (mask & GDB_WRITABLE)
|
if (mask & GDB_WRITABLE)
|
FD_SET (fd, &gdb_notifier.check_masks[1]);
|
FD_SET (fd, &gdb_notifier.check_masks[1]);
|
else
|
else
|
FD_CLR (fd, &gdb_notifier.check_masks[1]);
|
FD_CLR (fd, &gdb_notifier.check_masks[1]);
|
|
|
if (mask & GDB_EXCEPTION)
|
if (mask & GDB_EXCEPTION)
|
FD_SET (fd, &gdb_notifier.check_masks[2]);
|
FD_SET (fd, &gdb_notifier.check_masks[2]);
|
else
|
else
|
FD_CLR (fd, &gdb_notifier.check_masks[2]);
|
FD_CLR (fd, &gdb_notifier.check_masks[2]);
|
|
|
if (gdb_notifier.num_fds <= fd)
|
if (gdb_notifier.num_fds <= fd)
|
gdb_notifier.num_fds = fd + 1;
|
gdb_notifier.num_fds = fd + 1;
|
}
|
}
|
}
|
}
|
|
|
file_ptr->proc = proc;
|
file_ptr->proc = proc;
|
file_ptr->client_data = client_data;
|
file_ptr->client_data = client_data;
|
file_ptr->mask = mask;
|
file_ptr->mask = mask;
|
}
|
}
|
|
|
/* Remove the file descriptor FD from the list of monitored fd's:
|
/* Remove the file descriptor FD from the list of monitored fd's:
|
i.e. we don't care anymore about events on the FD. */
|
i.e. we don't care anymore about events on the FD. */
|
void
|
void
|
delete_file_handler (int fd)
|
delete_file_handler (int fd)
|
{
|
{
|
file_handler *file_ptr, *prev_ptr = NULL;
|
file_handler *file_ptr, *prev_ptr = NULL;
|
int i;
|
int i;
|
#ifdef HAVE_POLL
|
#ifdef HAVE_POLL
|
int j;
|
int j;
|
struct pollfd *new_poll_fds;
|
struct pollfd *new_poll_fds;
|
#endif
|
#endif
|
|
|
/* Find the entry for the given file. */
|
/* Find the entry for the given file. */
|
|
|
for (file_ptr = gdb_notifier.first_file_handler; file_ptr != NULL;
|
for (file_ptr = gdb_notifier.first_file_handler; file_ptr != NULL;
|
file_ptr = file_ptr->next_file)
|
file_ptr = file_ptr->next_file)
|
{
|
{
|
if (file_ptr->fd == fd)
|
if (file_ptr->fd == fd)
|
break;
|
break;
|
}
|
}
|
|
|
if (file_ptr == NULL)
|
if (file_ptr == NULL)
|
return;
|
return;
|
|
|
if (use_poll)
|
if (use_poll)
|
{
|
{
|
#ifdef HAVE_POLL
|
#ifdef HAVE_POLL
|
/* Create a new poll_fds array by copying every fd's information but the
|
/* Create a new poll_fds array by copying every fd's information but the
|
one we want to get rid of. */
|
one we want to get rid of. */
|
|
|
new_poll_fds =
|
new_poll_fds =
|
(struct pollfd *) xmalloc ((gdb_notifier.num_fds - 1) * sizeof (struct pollfd));
|
(struct pollfd *) xmalloc ((gdb_notifier.num_fds - 1) * sizeof (struct pollfd));
|
|
|
for (i = 0, j = 0; i < gdb_notifier.num_fds; i++)
|
for (i = 0, j = 0; i < gdb_notifier.num_fds; i++)
|
{
|
{
|
if ((gdb_notifier.poll_fds + i)->fd != fd)
|
if ((gdb_notifier.poll_fds + i)->fd != fd)
|
{
|
{
|
(new_poll_fds + j)->fd = (gdb_notifier.poll_fds + i)->fd;
|
(new_poll_fds + j)->fd = (gdb_notifier.poll_fds + i)->fd;
|
(new_poll_fds + j)->events = (gdb_notifier.poll_fds + i)->events;
|
(new_poll_fds + j)->events = (gdb_notifier.poll_fds + i)->events;
|
(new_poll_fds + j)->revents = (gdb_notifier.poll_fds + i)->revents;
|
(new_poll_fds + j)->revents = (gdb_notifier.poll_fds + i)->revents;
|
j++;
|
j++;
|
}
|
}
|
}
|
}
|
xfree (gdb_notifier.poll_fds);
|
xfree (gdb_notifier.poll_fds);
|
gdb_notifier.poll_fds = new_poll_fds;
|
gdb_notifier.poll_fds = new_poll_fds;
|
gdb_notifier.num_fds--;
|
gdb_notifier.num_fds--;
|
#else
|
#else
|
internal_error (__FILE__, __LINE__,
|
internal_error (__FILE__, __LINE__,
|
_("use_poll without HAVE_POLL"));
|
_("use_poll without HAVE_POLL"));
|
#endif /* HAVE_POLL */
|
#endif /* HAVE_POLL */
|
}
|
}
|
else
|
else
|
{
|
{
|
if (file_ptr->mask & GDB_READABLE)
|
if (file_ptr->mask & GDB_READABLE)
|
FD_CLR (fd, &gdb_notifier.check_masks[0]);
|
FD_CLR (fd, &gdb_notifier.check_masks[0]);
|
if (file_ptr->mask & GDB_WRITABLE)
|
if (file_ptr->mask & GDB_WRITABLE)
|
FD_CLR (fd, &gdb_notifier.check_masks[1]);
|
FD_CLR (fd, &gdb_notifier.check_masks[1]);
|
if (file_ptr->mask & GDB_EXCEPTION)
|
if (file_ptr->mask & GDB_EXCEPTION)
|
FD_CLR (fd, &gdb_notifier.check_masks[2]);
|
FD_CLR (fd, &gdb_notifier.check_masks[2]);
|
|
|
/* Find current max fd. */
|
/* Find current max fd. */
|
|
|
if ((fd + 1) == gdb_notifier.num_fds)
|
if ((fd + 1) == gdb_notifier.num_fds)
|
{
|
{
|
gdb_notifier.num_fds--;
|
gdb_notifier.num_fds--;
|
for (i = gdb_notifier.num_fds; i; i--)
|
for (i = gdb_notifier.num_fds; i; i--)
|
{
|
{
|
if (FD_ISSET (i - 1, &gdb_notifier.check_masks[0])
|
if (FD_ISSET (i - 1, &gdb_notifier.check_masks[0])
|
|| FD_ISSET (i - 1, &gdb_notifier.check_masks[1])
|
|| FD_ISSET (i - 1, &gdb_notifier.check_masks[1])
|
|| FD_ISSET (i - 1, &gdb_notifier.check_masks[2]))
|
|| FD_ISSET (i - 1, &gdb_notifier.check_masks[2]))
|
break;
|
break;
|
}
|
}
|
gdb_notifier.num_fds = i;
|
gdb_notifier.num_fds = i;
|
}
|
}
|
}
|
}
|
|
|
/* Deactivate the file descriptor, by clearing its mask,
|
/* Deactivate the file descriptor, by clearing its mask,
|
so that it will not fire again. */
|
so that it will not fire again. */
|
|
|
file_ptr->mask = 0;
|
file_ptr->mask = 0;
|
|
|
/* Get rid of the file handler in the file handler list. */
|
/* Get rid of the file handler in the file handler list. */
|
if (file_ptr == gdb_notifier.first_file_handler)
|
if (file_ptr == gdb_notifier.first_file_handler)
|
gdb_notifier.first_file_handler = file_ptr->next_file;
|
gdb_notifier.first_file_handler = file_ptr->next_file;
|
else
|
else
|
{
|
{
|
for (prev_ptr = gdb_notifier.first_file_handler;
|
for (prev_ptr = gdb_notifier.first_file_handler;
|
prev_ptr->next_file != file_ptr;
|
prev_ptr->next_file != file_ptr;
|
prev_ptr = prev_ptr->next_file)
|
prev_ptr = prev_ptr->next_file)
|
;
|
;
|
prev_ptr->next_file = file_ptr->next_file;
|
prev_ptr->next_file = file_ptr->next_file;
|
}
|
}
|
xfree (file_ptr);
|
xfree (file_ptr);
|
}
|
}
|
|
|
/* Handle the given event by calling the procedure associated to the
|
/* Handle the given event by calling the procedure associated to the
|
corresponding file handler. Called by process_event indirectly,
|
corresponding file handler. Called by process_event indirectly,
|
through event_ptr->proc. EVENT_FILE_DESC is file descriptor of the
|
through event_ptr->proc. EVENT_FILE_DESC is file descriptor of the
|
event in the front of the event queue. */
|
event in the front of the event queue. */
|
static void
|
static void
|
handle_file_event (event_data data)
|
handle_file_event (event_data data)
|
{
|
{
|
file_handler *file_ptr;
|
file_handler *file_ptr;
|
int mask;
|
int mask;
|
#ifdef HAVE_POLL
|
#ifdef HAVE_POLL
|
int error_mask;
|
int error_mask;
|
int error_mask_returned;
|
int error_mask_returned;
|
#endif
|
#endif
|
int event_file_desc = data.integer;
|
int event_file_desc = data.integer;
|
|
|
/* Search the file handler list to find one that matches the fd in
|
/* Search the file handler list to find one that matches the fd in
|
the event. */
|
the event. */
|
for (file_ptr = gdb_notifier.first_file_handler; file_ptr != NULL;
|
for (file_ptr = gdb_notifier.first_file_handler; file_ptr != NULL;
|
file_ptr = file_ptr->next_file)
|
file_ptr = file_ptr->next_file)
|
{
|
{
|
if (file_ptr->fd == event_file_desc)
|
if (file_ptr->fd == event_file_desc)
|
{
|
{
|
/* With poll, the ready_mask could have any of three events
|
/* With poll, the ready_mask could have any of three events
|
set to 1: POLLHUP, POLLERR, POLLNVAL. These events cannot
|
set to 1: POLLHUP, POLLERR, POLLNVAL. These events cannot
|
be used in the requested event mask (events), but they
|
be used in the requested event mask (events), but they
|
can be returned in the return mask (revents). We need to
|
can be returned in the return mask (revents). We need to
|
check for those event too, and add them to the mask which
|
check for those event too, and add them to the mask which
|
will be passed to the handler. */
|
will be passed to the handler. */
|
|
|
/* See if the desired events (mask) match the received
|
/* See if the desired events (mask) match the received
|
events (ready_mask). */
|
events (ready_mask). */
|
|
|
if (use_poll)
|
if (use_poll)
|
{
|
{
|
#ifdef HAVE_POLL
|
#ifdef HAVE_POLL
|
error_mask = POLLHUP | POLLERR | POLLNVAL;
|
error_mask = POLLHUP | POLLERR | POLLNVAL;
|
mask = (file_ptr->ready_mask & file_ptr->mask) |
|
mask = (file_ptr->ready_mask & file_ptr->mask) |
|
(file_ptr->ready_mask & error_mask);
|
(file_ptr->ready_mask & error_mask);
|
error_mask_returned = mask & error_mask;
|
error_mask_returned = mask & error_mask;
|
|
|
if (error_mask_returned != 0)
|
if (error_mask_returned != 0)
|
{
|
{
|
/* Work in progress. We may need to tell somebody what
|
/* Work in progress. We may need to tell somebody what
|
kind of error we had. */
|
kind of error we had. */
|
if (error_mask_returned & POLLHUP)
|
if (error_mask_returned & POLLHUP)
|
printf_unfiltered (_("Hangup detected on fd %d\n"), file_ptr->fd);
|
printf_unfiltered (_("Hangup detected on fd %d\n"), file_ptr->fd);
|
if (error_mask_returned & POLLERR)
|
if (error_mask_returned & POLLERR)
|
printf_unfiltered (_("Error detected on fd %d\n"), file_ptr->fd);
|
printf_unfiltered (_("Error detected on fd %d\n"), file_ptr->fd);
|
if (error_mask_returned & POLLNVAL)
|
if (error_mask_returned & POLLNVAL)
|
printf_unfiltered (_("Invalid or non-`poll'able fd %d\n"), file_ptr->fd);
|
printf_unfiltered (_("Invalid or non-`poll'able fd %d\n"), file_ptr->fd);
|
file_ptr->error = 1;
|
file_ptr->error = 1;
|
}
|
}
|
else
|
else
|
file_ptr->error = 0;
|
file_ptr->error = 0;
|
#else
|
#else
|
internal_error (__FILE__, __LINE__,
|
internal_error (__FILE__, __LINE__,
|
_("use_poll without HAVE_POLL"));
|
_("use_poll without HAVE_POLL"));
|
#endif /* HAVE_POLL */
|
#endif /* HAVE_POLL */
|
}
|
}
|
else
|
else
|
{
|
{
|
if (file_ptr->ready_mask & GDB_EXCEPTION)
|
if (file_ptr->ready_mask & GDB_EXCEPTION)
|
{
|
{
|
printf_unfiltered (_("Exception condition detected on fd %d\n"), file_ptr->fd);
|
printf_unfiltered (_("Exception condition detected on fd %d\n"), file_ptr->fd);
|
file_ptr->error = 1;
|
file_ptr->error = 1;
|
}
|
}
|
else
|
else
|
file_ptr->error = 0;
|
file_ptr->error = 0;
|
mask = file_ptr->ready_mask & file_ptr->mask;
|
mask = file_ptr->ready_mask & file_ptr->mask;
|
}
|
}
|
|
|
/* Clear the received events for next time around. */
|
/* Clear the received events for next time around. */
|
file_ptr->ready_mask = 0;
|
file_ptr->ready_mask = 0;
|
|
|
/* If there was a match, then call the handler. */
|
/* If there was a match, then call the handler. */
|
if (mask != 0)
|
if (mask != 0)
|
(*file_ptr->proc) (file_ptr->error, file_ptr->client_data);
|
(*file_ptr->proc) (file_ptr->error, file_ptr->client_data);
|
break;
|
break;
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
/* Called by gdb_do_one_event to wait for new events on the monitored
|
/* Called by gdb_do_one_event to wait for new events on the monitored
|
file descriptors. Queue file events as they are detected by the
|
file descriptors. Queue file events as they are detected by the
|
poll. If BLOCK and if there are no events, this function will
|
poll. If BLOCK and if there are no events, this function will
|
block in the call to poll. Return -1 if there are no files
|
block in the call to poll. Return -1 if there are no files
|
descriptors to monitor, otherwise return 0. */
|
descriptors to monitor, otherwise return 0. */
|
static int
|
static int
|
gdb_wait_for_event (int block)
|
gdb_wait_for_event (int block)
|
{
|
{
|
file_handler *file_ptr;
|
file_handler *file_ptr;
|
gdb_event *file_event_ptr;
|
gdb_event *file_event_ptr;
|
int num_found = 0;
|
int num_found = 0;
|
int i;
|
int i;
|
|
|
/* Make sure all output is done before getting another event. */
|
/* Make sure all output is done before getting another event. */
|
gdb_flush (gdb_stdout);
|
gdb_flush (gdb_stdout);
|
gdb_flush (gdb_stderr);
|
gdb_flush (gdb_stderr);
|
|
|
if (gdb_notifier.num_fds == 0)
|
if (gdb_notifier.num_fds == 0)
|
return -1;
|
return -1;
|
|
|
if (use_poll)
|
if (use_poll)
|
{
|
{
|
#ifdef HAVE_POLL
|
#ifdef HAVE_POLL
|
int timeout;
|
int timeout;
|
|
|
if (block)
|
if (block)
|
timeout = gdb_notifier.timeout_valid ? gdb_notifier.poll_timeout : -1;
|
timeout = gdb_notifier.timeout_valid ? gdb_notifier.poll_timeout : -1;
|
else
|
else
|
timeout = 0;
|
timeout = 0;
|
|
|
num_found = poll (gdb_notifier.poll_fds,
|
num_found = poll (gdb_notifier.poll_fds,
|
(unsigned long) gdb_notifier.num_fds, timeout);
|
(unsigned long) gdb_notifier.num_fds, timeout);
|
|
|
/* Don't print anything if we get out of poll because of a
|
/* Don't print anything if we get out of poll because of a
|
signal. */
|
signal. */
|
if (num_found == -1 && errno != EINTR)
|
if (num_found == -1 && errno != EINTR)
|
perror_with_name (("poll"));
|
perror_with_name (("poll"));
|
#else
|
#else
|
internal_error (__FILE__, __LINE__,
|
internal_error (__FILE__, __LINE__,
|
_("use_poll without HAVE_POLL"));
|
_("use_poll without HAVE_POLL"));
|
#endif /* HAVE_POLL */
|
#endif /* HAVE_POLL */
|
}
|
}
|
else
|
else
|
{
|
{
|
struct timeval select_timeout;
|
struct timeval select_timeout;
|
|
|
struct timeval *timeout_p;
|
struct timeval *timeout_p;
|
if (block)
|
if (block)
|
timeout_p = gdb_notifier.timeout_valid
|
timeout_p = gdb_notifier.timeout_valid
|
? &gdb_notifier.select_timeout : NULL;
|
? &gdb_notifier.select_timeout : NULL;
|
else
|
else
|
{
|
{
|
memset (&select_timeout, 0, sizeof (select_timeout));
|
memset (&select_timeout, 0, sizeof (select_timeout));
|
timeout_p = &select_timeout;
|
timeout_p = &select_timeout;
|
}
|
}
|
|
|
gdb_notifier.ready_masks[0] = gdb_notifier.check_masks[0];
|
gdb_notifier.ready_masks[0] = gdb_notifier.check_masks[0];
|
gdb_notifier.ready_masks[1] = gdb_notifier.check_masks[1];
|
gdb_notifier.ready_masks[1] = gdb_notifier.check_masks[1];
|
gdb_notifier.ready_masks[2] = gdb_notifier.check_masks[2];
|
gdb_notifier.ready_masks[2] = gdb_notifier.check_masks[2];
|
num_found = gdb_select (gdb_notifier.num_fds,
|
num_found = gdb_select (gdb_notifier.num_fds,
|
&gdb_notifier.ready_masks[0],
|
&gdb_notifier.ready_masks[0],
|
&gdb_notifier.ready_masks[1],
|
&gdb_notifier.ready_masks[1],
|
&gdb_notifier.ready_masks[2],
|
&gdb_notifier.ready_masks[2],
|
timeout_p);
|
timeout_p);
|
|
|
/* Clear the masks after an error from select. */
|
/* Clear the masks after an error from select. */
|
if (num_found == -1)
|
if (num_found == -1)
|
{
|
{
|
FD_ZERO (&gdb_notifier.ready_masks[0]);
|
FD_ZERO (&gdb_notifier.ready_masks[0]);
|
FD_ZERO (&gdb_notifier.ready_masks[1]);
|
FD_ZERO (&gdb_notifier.ready_masks[1]);
|
FD_ZERO (&gdb_notifier.ready_masks[2]);
|
FD_ZERO (&gdb_notifier.ready_masks[2]);
|
|
|
/* Dont print anything if we got a signal, let gdb handle
|
/* Dont print anything if we got a signal, let gdb handle
|
it. */
|
it. */
|
if (errno != EINTR)
|
if (errno != EINTR)
|
perror_with_name (("select"));
|
perror_with_name (("select"));
|
}
|
}
|
}
|
}
|
|
|
/* Enqueue all detected file events. */
|
/* Enqueue all detected file events. */
|
|
|
if (use_poll)
|
if (use_poll)
|
{
|
{
|
#ifdef HAVE_POLL
|
#ifdef HAVE_POLL
|
for (i = 0; (i < gdb_notifier.num_fds) && (num_found > 0); i++)
|
for (i = 0; (i < gdb_notifier.num_fds) && (num_found > 0); i++)
|
{
|
{
|
if ((gdb_notifier.poll_fds + i)->revents)
|
if ((gdb_notifier.poll_fds + i)->revents)
|
num_found--;
|
num_found--;
|
else
|
else
|
continue;
|
continue;
|
|
|
for (file_ptr = gdb_notifier.first_file_handler;
|
for (file_ptr = gdb_notifier.first_file_handler;
|
file_ptr != NULL;
|
file_ptr != NULL;
|
file_ptr = file_ptr->next_file)
|
file_ptr = file_ptr->next_file)
|
{
|
{
|
if (file_ptr->fd == (gdb_notifier.poll_fds + i)->fd)
|
if (file_ptr->fd == (gdb_notifier.poll_fds + i)->fd)
|
break;
|
break;
|
}
|
}
|
|
|
if (file_ptr)
|
if (file_ptr)
|
{
|
{
|
/* Enqueue an event only if this is still a new event for
|
/* Enqueue an event only if this is still a new event for
|
this fd. */
|
this fd. */
|
if (file_ptr->ready_mask == 0)
|
if (file_ptr->ready_mask == 0)
|
{
|
{
|
file_event_ptr = create_file_event (file_ptr->fd);
|
file_event_ptr = create_file_event (file_ptr->fd);
|
async_queue_event (file_event_ptr, TAIL);
|
async_queue_event (file_event_ptr, TAIL);
|
}
|
}
|
file_ptr->ready_mask = (gdb_notifier.poll_fds + i)->revents;
|
file_ptr->ready_mask = (gdb_notifier.poll_fds + i)->revents;
|
}
|
}
|
}
|
}
|
#else
|
#else
|
internal_error (__FILE__, __LINE__,
|
internal_error (__FILE__, __LINE__,
|
_("use_poll without HAVE_POLL"));
|
_("use_poll without HAVE_POLL"));
|
#endif /* HAVE_POLL */
|
#endif /* HAVE_POLL */
|
}
|
}
|
else
|
else
|
{
|
{
|
for (file_ptr = gdb_notifier.first_file_handler;
|
for (file_ptr = gdb_notifier.first_file_handler;
|
(file_ptr != NULL) && (num_found > 0);
|
(file_ptr != NULL) && (num_found > 0);
|
file_ptr = file_ptr->next_file)
|
file_ptr = file_ptr->next_file)
|
{
|
{
|
int mask = 0;
|
int mask = 0;
|
|
|
if (FD_ISSET (file_ptr->fd, &gdb_notifier.ready_masks[0]))
|
if (FD_ISSET (file_ptr->fd, &gdb_notifier.ready_masks[0]))
|
mask |= GDB_READABLE;
|
mask |= GDB_READABLE;
|
if (FD_ISSET (file_ptr->fd, &gdb_notifier.ready_masks[1]))
|
if (FD_ISSET (file_ptr->fd, &gdb_notifier.ready_masks[1]))
|
mask |= GDB_WRITABLE;
|
mask |= GDB_WRITABLE;
|
if (FD_ISSET (file_ptr->fd, &gdb_notifier.ready_masks[2]))
|
if (FD_ISSET (file_ptr->fd, &gdb_notifier.ready_masks[2]))
|
mask |= GDB_EXCEPTION;
|
mask |= GDB_EXCEPTION;
|
|
|
if (!mask)
|
if (!mask)
|
continue;
|
continue;
|
else
|
else
|
num_found--;
|
num_found--;
|
|
|
/* Enqueue an event only if this is still a new event for
|
/* Enqueue an event only if this is still a new event for
|
this fd. */
|
this fd. */
|
|
|
if (file_ptr->ready_mask == 0)
|
if (file_ptr->ready_mask == 0)
|
{
|
{
|
file_event_ptr = create_file_event (file_ptr->fd);
|
file_event_ptr = create_file_event (file_ptr->fd);
|
async_queue_event (file_event_ptr, TAIL);
|
async_queue_event (file_event_ptr, TAIL);
|
}
|
}
|
file_ptr->ready_mask = mask;
|
file_ptr->ready_mask = mask;
|
}
|
}
|
}
|
}
|
return 0;
|
return 0;
|
}
|
}
|
|
|
|
|
/* Create an asynchronous handler, allocating memory for it.
|
/* Create an asynchronous handler, allocating memory for it.
|
Return a pointer to the newly created handler.
|
Return a pointer to the newly created handler.
|
This pointer will be used to invoke the handler by
|
This pointer will be used to invoke the handler by
|
invoke_async_signal_handler.
|
invoke_async_signal_handler.
|
PROC is the function to call with CLIENT_DATA argument
|
PROC is the function to call with CLIENT_DATA argument
|
whenever the handler is invoked. */
|
whenever the handler is invoked. */
|
async_signal_handler *
|
async_signal_handler *
|
create_async_signal_handler (sig_handler_func * proc, gdb_client_data client_data)
|
create_async_signal_handler (sig_handler_func * proc, gdb_client_data client_data)
|
{
|
{
|
async_signal_handler *async_handler_ptr;
|
async_signal_handler *async_handler_ptr;
|
|
|
async_handler_ptr =
|
async_handler_ptr =
|
(async_signal_handler *) xmalloc (sizeof (async_signal_handler));
|
(async_signal_handler *) xmalloc (sizeof (async_signal_handler));
|
async_handler_ptr->ready = 0;
|
async_handler_ptr->ready = 0;
|
async_handler_ptr->next_handler = NULL;
|
async_handler_ptr->next_handler = NULL;
|
async_handler_ptr->proc = proc;
|
async_handler_ptr->proc = proc;
|
async_handler_ptr->client_data = client_data;
|
async_handler_ptr->client_data = client_data;
|
if (sighandler_list.first_handler == NULL)
|
if (sighandler_list.first_handler == NULL)
|
sighandler_list.first_handler = async_handler_ptr;
|
sighandler_list.first_handler = async_handler_ptr;
|
else
|
else
|
sighandler_list.last_handler->next_handler = async_handler_ptr;
|
sighandler_list.last_handler->next_handler = async_handler_ptr;
|
sighandler_list.last_handler = async_handler_ptr;
|
sighandler_list.last_handler = async_handler_ptr;
|
return async_handler_ptr;
|
return async_handler_ptr;
|
}
|
}
|
|
|
/* Call the handler from HANDLER immediately. This function runs
|
/* Call the handler from HANDLER immediately. This function runs
|
signal handlers when returning to the event loop would be too
|
signal handlers when returning to the event loop would be too
|
slow. */
|
slow. */
|
void
|
void
|
call_async_signal_handler (struct async_signal_handler *handler)
|
call_async_signal_handler (struct async_signal_handler *handler)
|
{
|
{
|
(*handler->proc) (handler->client_data);
|
(*handler->proc) (handler->client_data);
|
}
|
}
|
|
|
/* Mark the handler (ASYNC_HANDLER_PTR) as ready. This information will
|
/* Mark the handler (ASYNC_HANDLER_PTR) as ready. This information will
|
be used when the handlers are invoked, after we have waited for
|
be used when the handlers are invoked, after we have waited for
|
some event. The caller of this function is the interrupt handler
|
some event. The caller of this function is the interrupt handler
|
associated with a signal. */
|
associated with a signal. */
|
void
|
void
|
mark_async_signal_handler (async_signal_handler * async_handler_ptr)
|
mark_async_signal_handler (async_signal_handler * async_handler_ptr)
|
{
|
{
|
async_handler_ptr->ready = 1;
|
async_handler_ptr->ready = 1;
|
}
|
}
|
|
|
/* Call all the handlers that are ready. Returns true if any was
|
/* Call all the handlers that are ready. Returns true if any was
|
indeed ready. */
|
indeed ready. */
|
static int
|
static int
|
invoke_async_signal_handlers (void)
|
invoke_async_signal_handlers (void)
|
{
|
{
|
async_signal_handler *async_handler_ptr;
|
async_signal_handler *async_handler_ptr;
|
int any_ready = 0;
|
int any_ready = 0;
|
|
|
/* Invoke ready handlers. */
|
/* Invoke ready handlers. */
|
|
|
while (1)
|
while (1)
|
{
|
{
|
for (async_handler_ptr = sighandler_list.first_handler;
|
for (async_handler_ptr = sighandler_list.first_handler;
|
async_handler_ptr != NULL;
|
async_handler_ptr != NULL;
|
async_handler_ptr = async_handler_ptr->next_handler)
|
async_handler_ptr = async_handler_ptr->next_handler)
|
{
|
{
|
if (async_handler_ptr->ready)
|
if (async_handler_ptr->ready)
|
break;
|
break;
|
}
|
}
|
if (async_handler_ptr == NULL)
|
if (async_handler_ptr == NULL)
|
break;
|
break;
|
any_ready = 1;
|
any_ready = 1;
|
async_handler_ptr->ready = 0;
|
async_handler_ptr->ready = 0;
|
(*async_handler_ptr->proc) (async_handler_ptr->client_data);
|
(*async_handler_ptr->proc) (async_handler_ptr->client_data);
|
}
|
}
|
|
|
return any_ready;
|
return any_ready;
|
}
|
}
|
|
|
/* Delete an asynchronous handler (ASYNC_HANDLER_PTR).
|
/* Delete an asynchronous handler (ASYNC_HANDLER_PTR).
|
Free the space allocated for it. */
|
Free the space allocated for it. */
|
void
|
void
|
delete_async_signal_handler (async_signal_handler ** async_handler_ptr)
|
delete_async_signal_handler (async_signal_handler ** async_handler_ptr)
|
{
|
{
|
async_signal_handler *prev_ptr;
|
async_signal_handler *prev_ptr;
|
|
|
if (sighandler_list.first_handler == (*async_handler_ptr))
|
if (sighandler_list.first_handler == (*async_handler_ptr))
|
{
|
{
|
sighandler_list.first_handler = (*async_handler_ptr)->next_handler;
|
sighandler_list.first_handler = (*async_handler_ptr)->next_handler;
|
if (sighandler_list.first_handler == NULL)
|
if (sighandler_list.first_handler == NULL)
|
sighandler_list.last_handler = NULL;
|
sighandler_list.last_handler = NULL;
|
}
|
}
|
else
|
else
|
{
|
{
|
prev_ptr = sighandler_list.first_handler;
|
prev_ptr = sighandler_list.first_handler;
|
while (prev_ptr && prev_ptr->next_handler != (*async_handler_ptr))
|
while (prev_ptr && prev_ptr->next_handler != (*async_handler_ptr))
|
prev_ptr = prev_ptr->next_handler;
|
prev_ptr = prev_ptr->next_handler;
|
prev_ptr->next_handler = (*async_handler_ptr)->next_handler;
|
prev_ptr->next_handler = (*async_handler_ptr)->next_handler;
|
if (sighandler_list.last_handler == (*async_handler_ptr))
|
if (sighandler_list.last_handler == (*async_handler_ptr))
|
sighandler_list.last_handler = prev_ptr;
|
sighandler_list.last_handler = prev_ptr;
|
}
|
}
|
xfree ((*async_handler_ptr));
|
xfree ((*async_handler_ptr));
|
(*async_handler_ptr) = NULL;
|
(*async_handler_ptr) = NULL;
|
}
|
}
|
|
|
/* Create an asynchronous event handler, allocating memory for it.
|
/* Create an asynchronous event handler, allocating memory for it.
|
Return a pointer to the newly created handler. PROC is the
|
Return a pointer to the newly created handler. PROC is the
|
function to call with CLIENT_DATA argument whenever the handler is
|
function to call with CLIENT_DATA argument whenever the handler is
|
invoked. */
|
invoked. */
|
async_event_handler *
|
async_event_handler *
|
create_async_event_handler (async_event_handler_func *proc,
|
create_async_event_handler (async_event_handler_func *proc,
|
gdb_client_data client_data)
|
gdb_client_data client_data)
|
{
|
{
|
async_event_handler *h;
|
async_event_handler *h;
|
|
|
h = xmalloc (sizeof (*h));
|
h = xmalloc (sizeof (*h));
|
h->ready = 0;
|
h->ready = 0;
|
h->next_handler = NULL;
|
h->next_handler = NULL;
|
h->proc = proc;
|
h->proc = proc;
|
h->client_data = client_data;
|
h->client_data = client_data;
|
if (async_event_handler_list.first_handler == NULL)
|
if (async_event_handler_list.first_handler == NULL)
|
async_event_handler_list.first_handler = h;
|
async_event_handler_list.first_handler = h;
|
else
|
else
|
async_event_handler_list.last_handler->next_handler = h;
|
async_event_handler_list.last_handler->next_handler = h;
|
async_event_handler_list.last_handler = h;
|
async_event_handler_list.last_handler = h;
|
return h;
|
return h;
|
}
|
}
|
|
|
/* Mark the handler (ASYNC_HANDLER_PTR) as ready. This information
|
/* Mark the handler (ASYNC_HANDLER_PTR) as ready. This information
|
will be used by gdb_do_one_event. The caller will be whoever
|
will be used by gdb_do_one_event. The caller will be whoever
|
created the event source, and wants to signal that the event is
|
created the event source, and wants to signal that the event is
|
ready to be handled. */
|
ready to be handled. */
|
void
|
void
|
mark_async_event_handler (async_event_handler *async_handler_ptr)
|
mark_async_event_handler (async_event_handler *async_handler_ptr)
|
{
|
{
|
async_handler_ptr->ready = 1;
|
async_handler_ptr->ready = 1;
|
}
|
}
|
|
|
struct async_event_handler_data
|
struct async_event_handler_data
|
{
|
{
|
async_event_handler_func* proc;
|
async_event_handler_func* proc;
|
gdb_client_data client_data;
|
gdb_client_data client_data;
|
};
|
};
|
|
|
static void
|
static void
|
invoke_async_event_handler (event_data data)
|
invoke_async_event_handler (event_data data)
|
{
|
{
|
struct async_event_handler_data *hdata = data.ptr;
|
struct async_event_handler_data *hdata = data.ptr;
|
async_event_handler_func* proc = hdata->proc;
|
async_event_handler_func* proc = hdata->proc;
|
gdb_client_data client_data = hdata->client_data;
|
gdb_client_data client_data = hdata->client_data;
|
|
|
xfree (hdata);
|
xfree (hdata);
|
(*proc) (client_data);
|
(*proc) (client_data);
|
}
|
}
|
|
|
/* Check if any asynchronous event handlers are ready, and queue
|
/* Check if any asynchronous event handlers are ready, and queue
|
events in the ready queue for any that are. */
|
events in the ready queue for any that are. */
|
static void
|
static void
|
check_async_event_handlers (void)
|
check_async_event_handlers (void)
|
{
|
{
|
async_event_handler *async_handler_ptr;
|
async_event_handler *async_handler_ptr;
|
struct async_event_handler_data *hdata;
|
struct async_event_handler_data *hdata;
|
struct gdb_event *event_ptr;
|
struct gdb_event *event_ptr;
|
event_data data;
|
event_data data;
|
|
|
for (async_handler_ptr = async_event_handler_list.first_handler;
|
for (async_handler_ptr = async_event_handler_list.first_handler;
|
async_handler_ptr != NULL;
|
async_handler_ptr != NULL;
|
async_handler_ptr = async_handler_ptr->next_handler)
|
async_handler_ptr = async_handler_ptr->next_handler)
|
{
|
{
|
if (async_handler_ptr->ready)
|
if (async_handler_ptr->ready)
|
{
|
{
|
async_handler_ptr->ready = 0;
|
async_handler_ptr->ready = 0;
|
|
|
hdata = xmalloc (sizeof (*hdata));
|
hdata = xmalloc (sizeof (*hdata));
|
|
|
hdata->proc = async_handler_ptr->proc;
|
hdata->proc = async_handler_ptr->proc;
|
hdata->client_data = async_handler_ptr->client_data;
|
hdata->client_data = async_handler_ptr->client_data;
|
|
|
data.ptr = hdata;
|
data.ptr = hdata;
|
|
|
event_ptr = create_event (invoke_async_event_handler, data);
|
event_ptr = create_event (invoke_async_event_handler, data);
|
async_queue_event (event_ptr, TAIL);
|
async_queue_event (event_ptr, TAIL);
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
/* Delete an asynchronous handler (ASYNC_HANDLER_PTR).
|
/* Delete an asynchronous handler (ASYNC_HANDLER_PTR).
|
Free the space allocated for it. */
|
Free the space allocated for it. */
|
void
|
void
|
delete_async_event_handler (async_event_handler **async_handler_ptr)
|
delete_async_event_handler (async_event_handler **async_handler_ptr)
|
{
|
{
|
async_event_handler *prev_ptr;
|
async_event_handler *prev_ptr;
|
|
|
if (async_event_handler_list.first_handler == *async_handler_ptr)
|
if (async_event_handler_list.first_handler == *async_handler_ptr)
|
{
|
{
|
async_event_handler_list.first_handler = (*async_handler_ptr)->next_handler;
|
async_event_handler_list.first_handler = (*async_handler_ptr)->next_handler;
|
if (async_event_handler_list.first_handler == NULL)
|
if (async_event_handler_list.first_handler == NULL)
|
async_event_handler_list.last_handler = NULL;
|
async_event_handler_list.last_handler = NULL;
|
}
|
}
|
else
|
else
|
{
|
{
|
prev_ptr = async_event_handler_list.first_handler;
|
prev_ptr = async_event_handler_list.first_handler;
|
while (prev_ptr && prev_ptr->next_handler != *async_handler_ptr)
|
while (prev_ptr && prev_ptr->next_handler != *async_handler_ptr)
|
prev_ptr = prev_ptr->next_handler;
|
prev_ptr = prev_ptr->next_handler;
|
prev_ptr->next_handler = (*async_handler_ptr)->next_handler;
|
prev_ptr->next_handler = (*async_handler_ptr)->next_handler;
|
if (async_event_handler_list.last_handler == (*async_handler_ptr))
|
if (async_event_handler_list.last_handler == (*async_handler_ptr))
|
async_event_handler_list.last_handler = prev_ptr;
|
async_event_handler_list.last_handler = prev_ptr;
|
}
|
}
|
xfree (*async_handler_ptr);
|
xfree (*async_handler_ptr);
|
*async_handler_ptr = NULL;
|
*async_handler_ptr = NULL;
|
}
|
}
|
|
|
/* Create a timer that will expire in MILLISECONDS from now. When the
|
/* Create a timer that will expire in MILLISECONDS from now. When the
|
timer is ready, PROC will be executed. At creation, the timer is
|
timer is ready, PROC will be executed. At creation, the timer is
|
aded to the timers queue. This queue is kept sorted in order of
|
aded to the timers queue. This queue is kept sorted in order of
|
increasing timers. Return a handle to the timer struct. */
|
increasing timers. Return a handle to the timer struct. */
|
int
|
int
|
create_timer (int milliseconds, timer_handler_func * proc, gdb_client_data client_data)
|
create_timer (int milliseconds, timer_handler_func * proc, gdb_client_data client_data)
|
{
|
{
|
struct gdb_timer *timer_ptr, *timer_index, *prev_timer;
|
struct gdb_timer *timer_ptr, *timer_index, *prev_timer;
|
struct timeval time_now, delta;
|
struct timeval time_now, delta;
|
|
|
/* compute seconds */
|
/* compute seconds */
|
delta.tv_sec = milliseconds / 1000;
|
delta.tv_sec = milliseconds / 1000;
|
/* compute microseconds */
|
/* compute microseconds */
|
delta.tv_usec = (milliseconds % 1000) * 1000;
|
delta.tv_usec = (milliseconds % 1000) * 1000;
|
|
|
gettimeofday (&time_now, NULL);
|
gettimeofday (&time_now, NULL);
|
|
|
timer_ptr = (struct gdb_timer *) xmalloc (sizeof (gdb_timer));
|
timer_ptr = (struct gdb_timer *) xmalloc (sizeof (gdb_timer));
|
timer_ptr->when.tv_sec = time_now.tv_sec + delta.tv_sec;
|
timer_ptr->when.tv_sec = time_now.tv_sec + delta.tv_sec;
|
timer_ptr->when.tv_usec = time_now.tv_usec + delta.tv_usec;
|
timer_ptr->when.tv_usec = time_now.tv_usec + delta.tv_usec;
|
/* carry? */
|
/* carry? */
|
if (timer_ptr->when.tv_usec >= 1000000)
|
if (timer_ptr->when.tv_usec >= 1000000)
|
{
|
{
|
timer_ptr->when.tv_sec += 1;
|
timer_ptr->when.tv_sec += 1;
|
timer_ptr->when.tv_usec -= 1000000;
|
timer_ptr->when.tv_usec -= 1000000;
|
}
|
}
|
timer_ptr->proc = proc;
|
timer_ptr->proc = proc;
|
timer_ptr->client_data = client_data;
|
timer_ptr->client_data = client_data;
|
timer_list.num_timers++;
|
timer_list.num_timers++;
|
timer_ptr->timer_id = timer_list.num_timers;
|
timer_ptr->timer_id = timer_list.num_timers;
|
|
|
/* Now add the timer to the timer queue, making sure it is sorted in
|
/* Now add the timer to the timer queue, making sure it is sorted in
|
increasing order of expiration. */
|
increasing order of expiration. */
|
|
|
for (timer_index = timer_list.first_timer;
|
for (timer_index = timer_list.first_timer;
|
timer_index != NULL;
|
timer_index != NULL;
|
timer_index = timer_index->next)
|
timer_index = timer_index->next)
|
{
|
{
|
/* If the seconds field is greater or if it is the same, but the
|
/* If the seconds field is greater or if it is the same, but the
|
microsecond field is greater. */
|
microsecond field is greater. */
|
if ((timer_index->when.tv_sec > timer_ptr->when.tv_sec)
|
if ((timer_index->when.tv_sec > timer_ptr->when.tv_sec)
|
|| ((timer_index->when.tv_sec == timer_ptr->when.tv_sec)
|
|| ((timer_index->when.tv_sec == timer_ptr->when.tv_sec)
|
&& (timer_index->when.tv_usec > timer_ptr->when.tv_usec)))
|
&& (timer_index->when.tv_usec > timer_ptr->when.tv_usec)))
|
break;
|
break;
|
}
|
}
|
|
|
if (timer_index == timer_list.first_timer)
|
if (timer_index == timer_list.first_timer)
|
{
|
{
|
timer_ptr->next = timer_list.first_timer;
|
timer_ptr->next = timer_list.first_timer;
|
timer_list.first_timer = timer_ptr;
|
timer_list.first_timer = timer_ptr;
|
|
|
}
|
}
|
else
|
else
|
{
|
{
|
for (prev_timer = timer_list.first_timer;
|
for (prev_timer = timer_list.first_timer;
|
prev_timer->next != timer_index;
|
prev_timer->next != timer_index;
|
prev_timer = prev_timer->next)
|
prev_timer = prev_timer->next)
|
;
|
;
|
|
|
prev_timer->next = timer_ptr;
|
prev_timer->next = timer_ptr;
|
timer_ptr->next = timer_index;
|
timer_ptr->next = timer_index;
|
}
|
}
|
|
|
gdb_notifier.timeout_valid = 0;
|
gdb_notifier.timeout_valid = 0;
|
return timer_ptr->timer_id;
|
return timer_ptr->timer_id;
|
}
|
}
|
|
|
/* There is a chance that the creator of the timer wants to get rid of
|
/* There is a chance that the creator of the timer wants to get rid of
|
it before it expires. */
|
it before it expires. */
|
void
|
void
|
delete_timer (int id)
|
delete_timer (int id)
|
{
|
{
|
struct gdb_timer *timer_ptr, *prev_timer = NULL;
|
struct gdb_timer *timer_ptr, *prev_timer = NULL;
|
|
|
/* Find the entry for the given timer. */
|
/* Find the entry for the given timer. */
|
|
|
for (timer_ptr = timer_list.first_timer; timer_ptr != NULL;
|
for (timer_ptr = timer_list.first_timer; timer_ptr != NULL;
|
timer_ptr = timer_ptr->next)
|
timer_ptr = timer_ptr->next)
|
{
|
{
|
if (timer_ptr->timer_id == id)
|
if (timer_ptr->timer_id == id)
|
break;
|
break;
|
}
|
}
|
|
|
if (timer_ptr == NULL)
|
if (timer_ptr == NULL)
|
return;
|
return;
|
/* Get rid of the timer in the timer list. */
|
/* Get rid of the timer in the timer list. */
|
if (timer_ptr == timer_list.first_timer)
|
if (timer_ptr == timer_list.first_timer)
|
timer_list.first_timer = timer_ptr->next;
|
timer_list.first_timer = timer_ptr->next;
|
else
|
else
|
{
|
{
|
for (prev_timer = timer_list.first_timer;
|
for (prev_timer = timer_list.first_timer;
|
prev_timer->next != timer_ptr;
|
prev_timer->next != timer_ptr;
|
prev_timer = prev_timer->next)
|
prev_timer = prev_timer->next)
|
;
|
;
|
prev_timer->next = timer_ptr->next;
|
prev_timer->next = timer_ptr->next;
|
}
|
}
|
xfree (timer_ptr);
|
xfree (timer_ptr);
|
|
|
gdb_notifier.timeout_valid = 0;
|
gdb_notifier.timeout_valid = 0;
|
}
|
}
|
|
|
/* When a timer event is put on the event queue, it will be handled by
|
/* When a timer event is put on the event queue, it will be handled by
|
this function. Just call the associated procedure and delete the
|
this function. Just call the associated procedure and delete the
|
timer event from the event queue. Repeat this for each timer that
|
timer event from the event queue. Repeat this for each timer that
|
has expired. */
|
has expired. */
|
static void
|
static void
|
handle_timer_event (event_data dummy)
|
handle_timer_event (event_data dummy)
|
{
|
{
|
struct timeval time_now;
|
struct timeval time_now;
|
struct gdb_timer *timer_ptr, *saved_timer;
|
struct gdb_timer *timer_ptr, *saved_timer;
|
|
|
gettimeofday (&time_now, NULL);
|
gettimeofday (&time_now, NULL);
|
timer_ptr = timer_list.first_timer;
|
timer_ptr = timer_list.first_timer;
|
|
|
while (timer_ptr != NULL)
|
while (timer_ptr != NULL)
|
{
|
{
|
if ((timer_ptr->when.tv_sec > time_now.tv_sec)
|
if ((timer_ptr->when.tv_sec > time_now.tv_sec)
|
|| ((timer_ptr->when.tv_sec == time_now.tv_sec)
|
|| ((timer_ptr->when.tv_sec == time_now.tv_sec)
|
&& (timer_ptr->when.tv_usec > time_now.tv_usec)))
|
&& (timer_ptr->when.tv_usec > time_now.tv_usec)))
|
break;
|
break;
|
|
|
/* Get rid of the timer from the beginning of the list. */
|
/* Get rid of the timer from the beginning of the list. */
|
timer_list.first_timer = timer_ptr->next;
|
timer_list.first_timer = timer_ptr->next;
|
saved_timer = timer_ptr;
|
saved_timer = timer_ptr;
|
timer_ptr = timer_ptr->next;
|
timer_ptr = timer_ptr->next;
|
/* Call the procedure associated with that timer. */
|
/* Call the procedure associated with that timer. */
|
(*saved_timer->proc) (saved_timer->client_data);
|
(*saved_timer->proc) (saved_timer->client_data);
|
xfree (saved_timer);
|
xfree (saved_timer);
|
}
|
}
|
|
|
gdb_notifier.timeout_valid = 0;
|
gdb_notifier.timeout_valid = 0;
|
}
|
}
|
|
|
/* Check whether any timers in the timers queue are ready. If at least
|
/* Check whether any timers in the timers queue are ready. If at least
|
one timer is ready, stick an event onto the event queue. Even in
|
one timer is ready, stick an event onto the event queue. Even in
|
case more than one timer is ready, one event is enough, because the
|
case more than one timer is ready, one event is enough, because the
|
handle_timer_event() will go through the timers list and call the
|
handle_timer_event() will go through the timers list and call the
|
procedures associated with all that have expired. Update the
|
procedures associated with all that have expired. Update the
|
timeout for the select() or poll() as well. */
|
timeout for the select() or poll() as well. */
|
static void
|
static void
|
poll_timers (void)
|
poll_timers (void)
|
{
|
{
|
struct timeval time_now, delta;
|
struct timeval time_now, delta;
|
gdb_event *event_ptr;
|
gdb_event *event_ptr;
|
|
|
if (timer_list.first_timer != NULL)
|
if (timer_list.first_timer != NULL)
|
{
|
{
|
gettimeofday (&time_now, NULL);
|
gettimeofday (&time_now, NULL);
|
delta.tv_sec = timer_list.first_timer->when.tv_sec - time_now.tv_sec;
|
delta.tv_sec = timer_list.first_timer->when.tv_sec - time_now.tv_sec;
|
delta.tv_usec = timer_list.first_timer->when.tv_usec - time_now.tv_usec;
|
delta.tv_usec = timer_list.first_timer->when.tv_usec - time_now.tv_usec;
|
/* borrow? */
|
/* borrow? */
|
if (delta.tv_usec < 0)
|
if (delta.tv_usec < 0)
|
{
|
{
|
delta.tv_sec -= 1;
|
delta.tv_sec -= 1;
|
delta.tv_usec += 1000000;
|
delta.tv_usec += 1000000;
|
}
|
}
|
|
|
/* Oops it expired already. Tell select / poll to return
|
/* Oops it expired already. Tell select / poll to return
|
immediately. (Cannot simply test if delta.tv_sec is negative
|
immediately. (Cannot simply test if delta.tv_sec is negative
|
because time_t might be unsigned.) */
|
because time_t might be unsigned.) */
|
if (timer_list.first_timer->when.tv_sec < time_now.tv_sec
|
if (timer_list.first_timer->when.tv_sec < time_now.tv_sec
|
|| (timer_list.first_timer->when.tv_sec == time_now.tv_sec
|
|| (timer_list.first_timer->when.tv_sec == time_now.tv_sec
|
&& timer_list.first_timer->when.tv_usec < time_now.tv_usec))
|
&& timer_list.first_timer->when.tv_usec < time_now.tv_usec))
|
{
|
{
|
delta.tv_sec = 0;
|
delta.tv_sec = 0;
|
delta.tv_usec = 0;
|
delta.tv_usec = 0;
|
}
|
}
|
|
|
if (delta.tv_sec == 0 && delta.tv_usec == 0)
|
if (delta.tv_sec == 0 && delta.tv_usec == 0)
|
{
|
{
|
event_ptr = (gdb_event *) xmalloc (sizeof (gdb_event));
|
event_ptr = (gdb_event *) xmalloc (sizeof (gdb_event));
|
event_ptr->proc = handle_timer_event;
|
event_ptr->proc = handle_timer_event;
|
event_ptr->data.integer = timer_list.first_timer->timer_id;
|
event_ptr->data.integer = timer_list.first_timer->timer_id;
|
async_queue_event (event_ptr, TAIL);
|
async_queue_event (event_ptr, TAIL);
|
}
|
}
|
|
|
/* Now we need to update the timeout for select/ poll, because we
|
/* Now we need to update the timeout for select/ poll, because we
|
don't want to sit there while this timer is expiring. */
|
don't want to sit there while this timer is expiring. */
|
if (use_poll)
|
if (use_poll)
|
{
|
{
|
#ifdef HAVE_POLL
|
#ifdef HAVE_POLL
|
gdb_notifier.poll_timeout = delta.tv_sec * 1000;
|
gdb_notifier.poll_timeout = delta.tv_sec * 1000;
|
#else
|
#else
|
internal_error (__FILE__, __LINE__,
|
internal_error (__FILE__, __LINE__,
|
_("use_poll without HAVE_POLL"));
|
_("use_poll without HAVE_POLL"));
|
#endif /* HAVE_POLL */
|
#endif /* HAVE_POLL */
|
}
|
}
|
else
|
else
|
{
|
{
|
gdb_notifier.select_timeout.tv_sec = delta.tv_sec;
|
gdb_notifier.select_timeout.tv_sec = delta.tv_sec;
|
gdb_notifier.select_timeout.tv_usec = delta.tv_usec;
|
gdb_notifier.select_timeout.tv_usec = delta.tv_usec;
|
}
|
}
|
gdb_notifier.timeout_valid = 1;
|
gdb_notifier.timeout_valid = 1;
|
}
|
}
|
else
|
else
|
gdb_notifier.timeout_valid = 0;
|
gdb_notifier.timeout_valid = 0;
|
}
|
}
|
|
|
