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BaseDisplay.cc

// BaseDisplay.cc for Blackbox - an X11 Window manager
// Copyright (c) 1997 - 2000 Brad Hughes (bhughes@tcac.net)
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
// $Id: BaseDisplay.cc,v 1.6 2002/10/08 02:06:41 vanrijn Exp $

// stupid macros needed to access some functions in version 2 of the GNU C
// library

#ifndef   _GNU_SOURCE
#define   _GNU_SOURCE
#endif // _GNU_SOURCE

#ifdef    HAVE_CONFIG_H
#  include "config.h"
#endif // HAVE_CONFIG_H

#ifdef    SHAPE
#  include <X11/extensions/shape.h>
#endif // SHAPE

#ifdef    HAVE_FCNTL_H
#  include <fcntl.h>
#endif // HAVE_FCNTL_H

#ifdef    HAVE_STDIO_H
#  include <stdio.h>
#endif // HAVE_STDIO_H

#ifdef    STDC_HEADERS
#  include <stdlib.h>
#  include <string.h>
#endif // STDC_HEADERS

#if HAVE_STRINGS_H
# include <strings.h>
#endif

#ifdef    HAVE_UNISTD_H
#  include <sys/types.h>
#  include <unistd.h>
#endif // HAVE_UNISTD_H

#ifdef    HAVE_SYS_SELECT_H
#  include <sys/select.h>
#endif // HAVE_SYS_SELECT_H

#ifdef    HAVE_SIGNAL_H
#  include <signal.h>
#endif // HAVE_SIGNAL_H

#ifdef    HAVE_SYS_SIGNAL_H
// #  include <sys/signal.h>
#endif // HAVE_SYS_SIGNAL_H

#ifndef   SA_NODEFER
#  ifdef   SA_INTERRUPT
#    define SA_NODEFER SA_INTERRUPT
#  else // !SA_INTERRUPT
#    define SA_NODEFER (0)
#  endif // SA_INTERRUPT
#endif // SA_NODEFER

#ifdef    HAVE_SYS_WAIT_H
#  include <sys/types.h>
#  include <sys/wait.h>
#endif // HAVE_SYS_WAIT_H

extern "C" {
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/Xutil.h>
#include <X11/cursorfont.h>
}

#include "BaseDisplay.hh"
#include "LinkedList.hh"
#include "Timer.hh"

// X error handler to handle any and all X errors while the application is
// running
static Bool internal_error = False;
static Window last_bad_window = None;

BaseDisplay *base_display;

#ifdef    DEBUG
static int handleXErrors(Display * d, XErrorEvent * e)
{
      char errtxt[128];

      XGetErrorText(d, e->error_code, errtxt, 128);
      fprintf(stderr, "%s:  X error: %s(%d) opcodes %d/%d\n"
                              "  resource 0x%lx\n",
                              base_display->getApplicationName(), errtxt, e->error_code,
                              e->request_code, e->minor_code, e->resourceid);
#else                                                                               // !DEBUG
static int handleXErrors(Display *, XErrorEvent * e)
{
#endif                                                                              // DEBUG

      if (e->error_code == BadWindow)
            last_bad_window = e->resourceid;
      if (internal_error)
            abort();

      return (False);
}


// signal handler to allow for proper and gentle shutdown

#ifndef   HAVE_SIGACTION
extern "C" RETSIGTYPE signalhandler(int sig)
{
#else                                                                               //  HAVE_SIGACTION
extern "C" void signalhandler(int sig)
{
#endif                                                                              // HAVE_SIGACTION

      static int re_enter = 0;

      switch (sig) {
      case SIGCHLD:
            int status;
            waitpid(-1, &status, WNOHANG | WUNTRACED);

#ifndef   HAVE_SIGACTION
            // assume broken, braindead sysv signal semantics
            signal(SIGCHLD, (RETSIGTYPE(*)(int)) signalhandler);
#endif                                                                              // HAVE_SIGACTION

            break;

      default:
            if (base_display->handleSignal(sig)) {

#ifndef   HAVE_SIGACTION
                  // assume broken, braindead sysv signal semantics
                  signal(sig, (RETSIGTYPE(*)(int)) signalhandler);
#endif                                                                              // HAVE_SIGACTION

                  return;
            }

            fprintf(stderr, "%s:  signal %d caught\n",
                                    base_display->getApplicationName(), sig);

            if (!base_display->isStartup() && !re_enter) {
                  internal_error = True;

                  re_enter = 1;
                  fprintf(stderr, "shutting down\n");
                  base_display->shutdown();
            }

            if (sig != SIGTERM && sig != SIGINT) {
                  fprintf(stderr, "aborting... dumping core\n");
                  abort();
            }

            exit(0);

            break;
      }
}


BaseDisplay::BaseDisplay(char *app_name, char *dpy_name)
{

      application_name = app_name;

      _startup = True;
      _shutdown = False;
      last_bad_window = None;

      ::base_display = this;

#ifdef    HAVE_SIGACTION
      struct sigaction action;

      action.sa_handler = signalhandler;
      action.sa_mask = sigset_t();
      action.sa_flags = SA_NOCLDSTOP | SA_NODEFER;

      sigaction(SIGSEGV, &action, NULL);
      sigaction(SIGFPE, &action, NULL);
      sigaction(SIGTERM, &action, NULL);
      sigaction(SIGINT, &action, NULL);
      sigaction(SIGCHLD, &action, NULL);
      sigaction(SIGHUP, &action, NULL);
      sigaction(SIGUSR1, &action, NULL);
      sigaction(SIGUSR2, &action, NULL);
#else                                                                               // !HAVE_SIGACTION
      signal(SIGSEGV, (RETSIGTYPE(*)(int)) signalhandler);
      signal(SIGFPE, (RETSIGTYPE(*)(int)) signalhandler);
      signal(SIGTERM, (RETSIGTYPE(*)(int)) signalhandler);
      signal(SIGINT, (RETSIGTYPE(*)(int)) signalhandler);
      signal(SIGUSR1, (RETSIGTYPE(*)(int)) signalhandler);
      signal(SIGUSR2, (RETSIGTYPE(*)(int)) signalhandler);
      signal(SIGHUP, (RETSIGTYPE(*)(int)) signalhandler);
      signal(SIGCHLD, (RETSIGTYPE(*)(int)) signalhandler);
#endif                                                                              // HAVE_SIGACTION

      if (!(display = XOpenDisplay(dpy_name))) {
            fprintf(stderr,
                                    "BaseDisplay::BaseDisplay: connection to X server failed.\n");
            ::exit(2);
      } else if (fcntl(ConnectionNumber(display), F_SETFD, 1) == -1) {
            fprintf(stderr,
                                    "BaseDisplay::BaseDisplay: couldn't mark display connection "
                                    "as close-on-exec\n");
            ::exit(2);
      }

      number_of_screens = ScreenCount(display);
      display_name = XDisplayName(dpy_name);

#ifdef    SHAPE
      shape.extensions = XShapeQueryExtension(display, &shape.event_basep,
                                                                                                                              &shape.error_basep);
#else                                                                               // !SHAPE
      shape.extensions = False;
#endif                                                                              // SHAPE

      xa_wm_colormap_windows =
             XInternAtom(display, "WM_COLORMAP_WINDOWS", False);
      xa_wm_protocols = XInternAtom(display, "WM_PROTOCOLS", False);
      xa_wm_state = XInternAtom(display, "WM_STATE", False);
      xa_wm_change_state = XInternAtom(display, "WM_CHANGE_STATE", False);
      xa_wm_delete_window = XInternAtom(display, "WM_DELETE_WINDOW", False);
      xa_wm_take_focus = XInternAtom(display, "WM_TAKE_FOCUS", False);
      motif_wm_hints = XInternAtom(display, "_MOTIF_WM_HINTS", False);

      blackbox_hints = XInternAtom(display, "_BLACKBOX_HINTS", False);
      blackbox_attributes =
             XInternAtom(display, "_BLACKBOX_ATTRIBUTES", False);
      blackbox_change_attributes =
             XInternAtom(display, "_BLACKBOX_CHANGE_ATTRIBUTES", False);

      blackbox_structure_messages =
             XInternAtom(display, "_BLACKBOX_STRUCTURE_MESSAGES", False);
      blackbox_notify_startup =
             XInternAtom(display, "_BLACKBOX_NOTIFY_STARTUP", False);
      blackbox_notify_window_add =
             XInternAtom(display, "_BLACKBOX_NOTIFY_WINDOW_ADD", False);
      blackbox_notify_window_del =
             XInternAtom(display, "_BLACKBOX_NOTIFY_WINDOW_DEL", False);
      blackbox_notify_current_workspace =
             XInternAtom(display, "_BLACKBOX_NOTIFY_CURRENT_WORKSPACE", False);
      blackbox_notify_workspace_count =
             XInternAtom(display, "_BLACKBOX_NOTIFY_WORKSPACE_COUNT", False);
      blackbox_notify_window_focus =
             XInternAtom(display, "_BLACKBOX_NOTIFY_WINDOW_FOCUS", False);
      blackbox_notify_window_raise =
             XInternAtom(display, "_BLACKBOX_NOTIFY_WINDOW_RAISE", False);
      blackbox_notify_window_lower =
             XInternAtom(display, "_BLACKBOX_NOTIFY_WINDOW_LOWER", False);

      blackbox_change_workspace =
             XInternAtom(display, "_BLACKBOX_CHANGE_WORKSPACE", False);
      blackbox_change_window_focus =
             XInternAtom(display, "_BLACKBOX_CHANGE_WINDOW_FOCUS", False);
      blackbox_cycle_window_focus =
             XInternAtom(display, "_BLACKBOX_CYCLE_WINDOW_FOCUS", False);

#ifdef    NEWWMSPEC

      net_supported = XInternAtom(display, "_NET_SUPPORTED", False);
      net_client_list = XInternAtom(display, "_NET_CLIENT_LIST", False);
      net_client_list_stacking =
             XInternAtom(display, "_NET_CLIENT_LIST_STACKING", False);
      net_number_of_desktops =
             XInternAtom(display, "_NET_NUMBER_OF_DESKTOPS", False);
      net_desktop_geometry =
             XInternAtom(display, "_NET_DESKTOP_GEOMETRY", False);
      net_desktop_viewport =
             XInternAtom(display, "_NET_DESKTOP_VIEWPORT", False);
      net_current_desktop =
             XInternAtom(display, "_NET_CURRENT_DESKTOP", False);
      net_desktop_names = XInternAtom(display, "_NET_DESKTOP_NAMES", False);
      net_active_window = XInternAtom(display, "_NET_ACTIVE_WINDOW", False);
      net_workarea = XInternAtom(display, "_NET_WORKAREA", False);
      net_supporting_wm_check =
             XInternAtom(display, "_NET_SUPPORTING_WM_CHECK", False);
      net_virtual_roots = XInternAtom(display, "_NET_VIRTUAL_ROOTS", False);

      net_close_window = XInternAtom(display, "_NET_CLOSE_WINDOW", False);
      net_wm_moveresize = XInternAtom(display, "_NET_WM_MOVERESIZE", False);

      net_properties = XInternAtom(display, "_NET_PROPERTIES", False);
      net_wm_name = XInternAtom(display, "_NET_WM_NAME", False);
      net_wm_desktop = XInternAtom(display, "_NET_WM_DESKTOP", False);
      net_wm_window_type = XInternAtom(display, "_NET_WM_WINDOW_TYPE", False);
      net_wm_state = XInternAtom(display, "_NET_WM_STATE", False);
      net_wm_strut = XInternAtom(display, "_NET_WM_STRUT", False);
      net_wm_icon_geometry =
             XInternAtom(display, "_NET_WM_ICON_GEOMETRY", False);
      net_wm_icon = XInternAtom(display, "_NET_WM_ICON", False);
      net_wm_pid = XInternAtom(display, "_NET_WM_PID", False);
      net_wm_handled_icons =
             XInternAtom(display, "_NET_WM_HANDLED_ICONS", False);

      net_wm_ping = XInternAtom(display, "_NET_WM_PING", False);

#endif                                                                              // NEWWMSPEC

      cursor.session = XCreateFontCursor(display, XC_left_ptr);
      cursor.move = XCreateFontCursor(display, XC_fleur);
      cursor.ll_angle = XCreateFontCursor(display, XC_ll_angle);
      cursor.lr_angle = XCreateFontCursor(display, XC_lr_angle);

      XSetErrorHandler((XErrorHandler) handleXErrors);

      timerList = new LinkedList < BTimer >;

      screenInfoList = new LinkedList < ScreenInfo >;
      int i;
      for (i = 0; i < number_of_screens; i++) {
            ScreenInfo *screeninfo = new ScreenInfo(this, i);
            screenInfoList->insert(screeninfo);
      }
}


BaseDisplay::~BaseDisplay(void)
{

      while (screenInfoList->count()) {
            ScreenInfo *si = screenInfoList->first();

            screenInfoList->remove(si);
            delete si;
      }

      delete screenInfoList;

      // we don't create the BTimers, we don't delete them
      while (timerList->count())
            timerList->remove(0);

      delete timerList;

      XCloseDisplay(display);
}


void BaseDisplay::eventLoop(void)
{
      run();

      int xfd = ConnectionNumber(display);
      time_t lastCheck = time(NULL);

      while ((!_shutdown) && (!internal_error)) {
            if (XPending(display)) {
                  XEvent e;
                  XNextEvent(display, &e);

                  if (last_bad_window != None && e.xany.window == last_bad_window) {
#ifdef    DEBUG
                        fprintf(stderr, "BaseDisplay::eventLoop(): "
                                                "removing bad window from event queue\n");
#endif                                                                              // DEBUG
                  } else {
                        last_bad_window = None;
                        process_event(&e);
                  }
            } else if (time(NULL) - lastCheck > 10) {
                  CheckConfig();
                  lastCheck = time(NULL);

            } else {
                  fd_set rfds;
                  timeval now, tm, *timeout = (timeval *) 0;

                  FD_ZERO(&rfds);
                  FD_SET(xfd, &rfds);

                  if (timerList->count()) {
                        gettimeofday(&now, 0);

                        tm.tv_sec = tm.tv_usec = 0l;

                        BTimer *timer = timerList->first();

                        tm.tv_sec = timer->getStartTime().tv_sec +
                               timer->getTimeout().tv_sec - now.tv_sec;
                        tm.tv_usec = timer->getStartTime().tv_usec +
                               timer->getTimeout().tv_usec - now.tv_usec;

                        while (tm.tv_usec >= 1000000) {
                              tm.tv_sec++;
                              tm.tv_usec -= 1000000;
                        }

                        while (tm.tv_usec < 0) {
                              if (tm.tv_sec > 0) {
                                    tm.tv_sec--;
                                    tm.tv_usec += 1000000;
                              } else {
                                    tm.tv_usec = 0;
                                    break;
                              }
                        }

                        timeout = &tm;
                  }

                  select(xfd + 1, &rfds, 0, 0, timeout);

                  // check for timer timeout
                  gettimeofday(&now, 0);

                  LinkedListIterator < BTimer > it(timerList);
                  for (; it.current(); it++) {
                        tm.tv_sec = it.current()->getStartTime().tv_sec +
                               it.current()->getTimeout().tv_sec;
                        tm.tv_usec = it.current()->getStartTime().tv_usec +
                               it.current()->getTimeout().tv_usec;

                        if ((now.tv_sec < tm.tv_sec) ||
                                    (now.tv_sec == tm.tv_sec && now.tv_usec < tm.tv_usec))
                              break;

                        it.current()->fireTimeout();

                        // restart the current timer so that the start time is updated
                        if (!it.current()->doOnce())
                              it.current()->start();
                        else
                              it.current()->stop();
                  }
            }
      }
}


const Bool BaseDisplay::validateWindow(Window window)
{
      XEvent event;
      if (XCheckTypedWindowEvent(display, window, DestroyNotify, &event)) {
            XPutBackEvent(display, &event);

            return False;
      }

      return True;
}


void BaseDisplay::addTimer(BTimer * timer)
{
      if (!timer)
            return;

      LinkedListIterator < BTimer > it(timerList);
      int index = 0;
      for (; it.current(); it++, index++)
            if ((it.current()->getTimeout().tv_sec > timer->getTimeout().tv_sec) ||
                        ((it.current()->getTimeout().tv_sec == timer->getTimeout().tv_sec)
                         && (it.current()->getTimeout().tv_usec >=
                                     timer->getTimeout().tv_usec))) break;

      timerList->insert(timer, index);
}


void BaseDisplay::removeTimer(BTimer * timer)
{
      timerList->remove(timer);
}


ScreenInfo::ScreenInfo(BaseDisplay * d, int num)
{

      basedisplay = d;
      screen_number = num;

      root_window = RootWindow(basedisplay->getXDisplay(), screen_number);
      depth = DefaultDepth(basedisplay->getXDisplay(), screen_number);

      width =
             WidthOfScreen(ScreenOfDisplay
                                                       (basedisplay->getXDisplay(), screen_number));
      height =
             HeightOfScreen(ScreenOfDisplay
                                                            (basedisplay->getXDisplay(), screen_number));

      // search for a TrueColor Visual... if we can't find one... we will use the
      // default visual for the screen
      XVisualInfo vinfo_template, *vinfo_return;
      int vinfo_nitems;

      vinfo_template.screen = screen_number;
      vinfo_template.c_class = TrueColor;

      visual = (Visual *) 0;

      if ((vinfo_return = XGetVisualInfo(basedisplay->getXDisplay(),
                                                                                                             VisualScreenMask | VisualClassMask,
                                                                                                             &vinfo_template, &vinfo_nitems)) &&
                  vinfo_nitems > 0) {
            for (int i = 0; i < vinfo_nitems; i++) {
                  if (depth < (vinfo_return + i)->depth) {
                        depth = (vinfo_return + i)->depth;
                        visual = (vinfo_return + i)->visual;
                  }
            }

            XFree(vinfo_return);
      }

      if (!visual)
            visual = DefaultVisual(basedisplay->getXDisplay(), screen_number);
}


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