basedisplay.cc

来自「蒙特卡洛仿真源代码很有参考价值要按照步骤进行操作」· CC 代码 · 共 534 行

// BaseDisplay.cc for Blackbox - an X11 Window manager
// Copyright (c) 1997 - 2000 Brad Hughes ([e-mail])
//
// 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.

// 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

#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/Xutil.h>
#include <X11/cursorfont.h>

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

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

#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

#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

#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

#if defined(HAVE_PROCESS_H) && defined(__EMX__)
#  include <process.h>
#endif //   HAVE_PROCESS_H             __EMX__


// 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
static RETSIGTYPE signalhandler(int sig) {
#else //  HAVE_SIGACTION
static 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;
	}
}


// convenience functions
#ifndef    __EMX__
void bexec(const char *command, char* displaystring) {
	if (! fork()) {
		setsid();
		putenv(displaystring);
		execl("/bin/sh", "/bin/sh", "-c", command, NULL);
		exit(0);
	}
}
#endif // !__EMX__


char *bstrdup(const char *s) {
	int l = strlen(s) + 1;
	char *n = new char[l];
	strncpy(n, s, l);
	return n;
}


BaseDisplay::BaseDisplay(char *app_name, char *dpy_name) {
	application_name = app_name;

	_startup = True;
	_shutdown = False;
	server_grabs = 0;
	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);

	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 {
			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::grab(void) {
	if (! server_grabs++)
		XGrabServer(display);
}


void BaseDisplay::ungrab(void) {
	if (! --server_grabs)
		XUngrabServer(display);

	if (server_grabs < 0) server_grabs = 0;
}


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);
}