Dogcows Code - chaz/openbox/blob - src/basedisplay.cc

   1 // -*- mode: C++; indent-tabs-mode: nil; -*-
   2 // BaseDisplay.cc for Blackbox - an X11 Window manager
   3 // Copyright (c) 2001 - 2002 Sean 'Shaleh' Perry <shaleh@debian.org>
   4 // Copyright (c) 1997 - 2000 Brad Hughes (bhughes@tcac.net)
   5 //
   6 // Permission is hereby granted, free of charge, to any person obtaining a
   7 // copy of this software and associated documentation files (the "Software"),
   8 // to deal in the Software without restriction, including without limitation
   9 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10 // and/or sell copies of the Software, and to permit persons to whom the
  11 // Software is furnished to do so, subject to the following conditions:
  12 //
  13 // The above copyright notice and this permission notice shall be included in
  14 // all copies or substantial portions of the Software.
  15 //
  16 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19 // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22 // DEALINGS IN THE SOFTWARE.
  23
  24 #ifdef    HAVE_CONFIG_H
  25 #  include "../config.h"
  26 #endif // HAVE_CONFIG_H
  27
  28 extern "C" {
  29 #include <X11/Xlib.h>
  30 #include <X11/Xatom.h>
  31 #include <X11/Xutil.h>
  32 #include <X11/keysym.h>
  33
  34 #ifdef    SHAPE
  35 #  include <X11/extensions/shape.h>
  36 #endif // SHAPE
  37
  38 #ifdef    XINERAMA
  39 #  include <X11/extensions/Xinerama.h>
  40 #endif // XINERAMA
  41
  42 #ifdef    HAVE_FCNTL_H
  43 #  include <fcntl.h>
  44 #endif // HAVE_FCNTL_H
  45
  46 #ifdef    HAVE_STDIO_H
  47 #  include <stdio.h>
  48 #endif // HAVE_STDIO_H
  49
  50 #ifdef HAVE_STDLIB_H
  51 #  include <stdlib.h>
  52 #endif // HAVE_STDLIB_H
  53
  54 #ifdef HAVE_STRING_H
  55 #  include <string.h>
  56 #endif // HAVE_STRING_H
  57
  58 #ifdef    HAVE_UNISTD_H
  59 #  include <sys/types.h>
  60 #  include <unistd.h>
  61 #endif // HAVE_UNISTD_H
  62
  63 #ifdef    HAVE_SYS_SELECT_H
  64 #  include <sys/select.h>
  65 #endif // HAVE_SYS_SELECT_H
  66
  67 #ifdef    HAVE_SIGNAL_H
  68 #  include <signal.h>
  69 #endif // HAVE_SIGNAL_H
  70
  71 #ifndef   SA_NODEFER
  72 #  ifdef   SA_INTERRUPT
  73 #    define SA_NODEFER SA_INTERRUPT
  74 #  else // !SA_INTERRUPT
  75 #    define SA_NODEFER (0)
  76 #  endif // SA_INTERRUPT
  77 #endif // SA_NODEFER
  78
  79 #ifdef    HAVE_SYS_WAIT_H
  80 #  include <sys/types.h>
  81 #  include <sys/wait.h>
  82 #endif // HAVE_SYS_WAIT_H
  83 }
  84
  85 #include <string>
  86 using std::string;
  87
  88 #include "basedisplay.hh"
  89 #include "gccache.hh"
  90 #include "timer.hh"
  91 #include "util.hh"
  92
  93
  94 // X error handler to handle any and all X errors while the application is
  95 // running
  96 static bool internal_error = False;
  97
  98 BaseDisplay *base_display;
  99
 100 static int handleXErrors(Display *d, XErrorEvent *e) {
 101 #ifdef    DEBUG
 102   char errtxt[128];
 103
 104   XGetErrorText(d, e->error_code, errtxt, 128);
 105   fprintf(stderr,
 106           i18n(BaseDisplaySet, BaseDisplayXError,
 107                "%s:  X error: %s(%d) opcodes %d/%d\n  resource 0x%lx\n"),
 108           base_display->getApplicationName(), errtxt, e->error_code,
 109           e->request_code, e->minor_code, e->resourceid);
 110 #else
 111   // shutup gcc
 112   (void) d;
 113   (void) e;
 114 #endif // DEBUG
 115
 116   if (internal_error) abort();
 117
 118   return(False);
 119 }
 120
 121
 122 // signal handler to allow for proper and gentle shutdown
 123
 124 #ifndef   HAVE_SIGACTION
 125 static RETSIGTYPE signalhandler(int sig) {
 126 #else //  HAVE_SIGACTION
 127 static void signalhandler(int sig) {
 128 #endif // HAVE_SIGACTION
 129
 130   static int re_enter = 0;
 131
 132   switch (sig) {
 133   case SIGCHLD:
 134     int status;
 135     waitpid(-1, &status, WNOHANG | WUNTRACED);
 136
 137 #ifndef   HAVE_SIGACTION
 138     // assume broken, braindead sysv signal semantics
 139     signal(SIGCHLD, (RETSIGTYPE (*)(int)) signalhandler);
 140 #endif // HAVE_SIGACTION
 141
 142     break;
 143
 144   default:
 145     if (base_display->handleSignal(sig)) {
 146
 147 #ifndef   HAVE_SIGACTION
 148       // assume broken, braindead sysv signal semantics
 149       signal(sig, (RETSIGTYPE (*)(int)) signalhandler);
 150 #endif // HAVE_SIGACTION
 151
 152       return;
 153     }
 154
 155     fprintf(stderr, i18n(BaseDisplaySet, BaseDisplaySignalCaught,
 156                          "%s:  signal %d caught\n"),
 157             base_display->getApplicationName(), sig);
 158
 159     if (! base_display->isStartup() && ! re_enter) {
 160       internal_error = True;
 161
 162       re_enter = 1;
 163       fprintf(stderr, i18n(BaseDisplaySet, BaseDisplayShuttingDown,
 164                            "shutting down\n"));
 165       base_display->shutdown();
 166     }
 167
 168     if (sig != SIGTERM && sig != SIGINT) {
 169       fprintf(stderr, i18n(BaseDisplaySet, BaseDisplayAborting,
 170                            "aborting... dumping core\n"));
 171       abort();
 172     }
 173
 174     exit(0);
 175
 176     break;
 177   }
 178 }
 179
 180
 181 BaseDisplay::BaseDisplay(const char *app_name, const char *dpy_name) {
 182   application_name = app_name;
 183
 184   run_state = STARTUP;
 185
 186   ::base_display = this;
 187
 188 #ifdef    HAVE_SIGACTION
 189   struct sigaction action;
 190
 191   action.sa_handler = signalhandler;
 192   action.sa_mask = sigset_t();
 193   action.sa_flags = SA_NOCLDSTOP | SA_NODEFER;
 194
 195   sigaction(SIGPIPE, &action, NULL);
 196   sigaction(SIGSEGV, &action, NULL);
 197   sigaction(SIGFPE, &action, NULL);
 198   sigaction(SIGTERM, &action, NULL);
 199   sigaction(SIGINT, &action, NULL);
 200   sigaction(SIGCHLD, &action, NULL);
 201   sigaction(SIGHUP, &action, NULL);
 202   sigaction(SIGUSR1, &action, NULL);
 203   sigaction(SIGUSR2, &action, NULL);
 204 #else // !HAVE_SIGACTION
 205   signal(SIGPIPE, (RETSIGTYPE (*)(int)) signalhandler);
 206   signal(SIGSEGV, (RETSIGTYPE (*)(int)) signalhandler);
 207   signal(SIGFPE, (RETSIGTYPE (*)(int)) signalhandler);
 208   signal(SIGTERM, (RETSIGTYPE (*)(int)) signalhandler);
 209   signal(SIGINT, (RETSIGTYPE (*)(int)) signalhandler);
 210   signal(SIGUSR1, (RETSIGTYPE (*)(int)) signalhandler);
 211   signal(SIGUSR2, (RETSIGTYPE (*)(int)) signalhandler);
 212   signal(SIGHUP, (RETSIGTYPE (*)(int)) signalhandler);
 213   signal(SIGCHLD, (RETSIGTYPE (*)(int)) signalhandler);
 214 #endif // HAVE_SIGACTION
 215
 216   if (! (display = XOpenDisplay(dpy_name))) {
 217     fprintf(stderr,
 218             i18n(BaseDisplaySet, BaseDisplayXConnectFail,
 219                "BaseDisplay::BaseDisplay: connection to X server failed.\n"));
 220     ::exit(2);
 221   } else if (fcntl(ConnectionNumber(display), F_SETFD, 1) == -1) {
 222     fprintf(stderr,
 223             i18n(BaseDisplaySet, BaseDisplayCloseOnExecFail,
 224                  "BaseDisplay::BaseDisplay: couldn't mark display connection "
 225                  "as close-on-exec\n"));
 226     ::exit(2);
 227   }
 228
 229   display_name = XDisplayName(dpy_name);
 230
 231 #ifdef    SHAPE
 232   shape.extensions = XShapeQueryExtension(display, &shape.event_basep,
 233                                           &shape.error_basep);
 234 #else // !SHAPE
 235   shape.extensions = False;
 236 #endif // SHAPE
 237
 238 #ifdef    XINERAMA
 239   if (XineramaQueryExtension(display, &xinerama.event_basep,
 240                              &xinerama.error_basep) &&
 241       XineramaQueryVersion(display, &xinerama.major, &xinerama.minor)) {
 242 #ifdef    DEBUG
 243     fprintf(stderr,
 244             "BaseDisplay::BaseDisplay: Found Xinerama version %d.%d\n",
 245             xinerama.major, xinerama.minor);
 246 #endif // DEBUG
 247     xinerama.extensions = True;
 248   } else {
 249     xinerama.extensions = False;
 250   }
 251 #endif // XINERAMA
 252
 253   XSetErrorHandler((XErrorHandler) handleXErrors);
 254
 255   screenInfoList.reserve(ScreenCount(display));
 256   for (int i = 0; i < ScreenCount(display); ++i)
 257     screenInfoList.push_back(ScreenInfo(this, i));
 258
 259   NumLockMask = ScrollLockMask = 0;
 260
 261   const XModifierKeymap* const modmap = XGetModifierMapping(display);
 262   if (modmap && modmap->max_keypermod > 0) {
 263     const int mask_table[] = {
 264       ShiftMask, LockMask, ControlMask, Mod1Mask,
 265       Mod2Mask, Mod3Mask, Mod4Mask, Mod5Mask
 266     };
 267     const size_t size = (sizeof(mask_table) / sizeof(mask_table[0])) *
 268       modmap->max_keypermod;
 269     // get the values of the keyboard lock modifiers
 270     // Note: Caps lock is not retrieved the same way as Scroll and Num lock
 271     // since it doesn't need to be.
 272     const KeyCode num_lock = XKeysymToKeycode(display, XK_Num_Lock);
 273     const KeyCode scroll_lock = XKeysymToKeycode(display, XK_Scroll_Lock);
 274
 275     for (size_t cnt = 0; cnt < size; ++cnt) {
 276       if (! modmap->modifiermap[cnt]) continue;
 277
 278       if (num_lock == modmap->modifiermap[cnt])
 279         NumLockMask = mask_table[cnt / modmap->max_keypermod];
 280       if (scroll_lock == modmap->modifiermap[cnt])
 281         ScrollLockMask = mask_table[cnt / modmap->max_keypermod];
 282     }
 283   }
 284
 285   MaskList[0] = 0;
 286   MaskList[1] = LockMask;
 287   MaskList[2] = NumLockMask;
 288   MaskList[3] = LockMask | NumLockMask;
 289   MaskList[4] = ScrollLockMask;
 290   MaskList[5] = ScrollLockMask | LockMask;
 291   MaskList[6] = ScrollLockMask | NumLockMask;
 292   MaskList[7] = ScrollLockMask | LockMask | NumLockMask;
 293   MaskListLength = sizeof(MaskList) / sizeof(MaskList[0]);
 294
 295   if (modmap) XFreeModifiermap(const_cast<XModifierKeymap*>(modmap));
 296
 297   gccache = (BGCCache *) 0;
 298 }
 299
 300
 301 BaseDisplay::~BaseDisplay(void) {
 302   delete gccache;
 303
 304   XCloseDisplay(display);
 305 }
 306
 307
 308 void BaseDisplay::eventLoop(void) {
 309   run();
 310
 311   const int xfd = ConnectionNumber(display);
 312
 313   while (run_state == RUNNING && ! internal_error) {
 314     if (XPending(display)) {
 315       XEvent e;
 316       XNextEvent(display, &e);
 317       process_event(&e);
 318     } else {
 319       fd_set rfds;
 320       timeval now, tm, *timeout = (timeval *) 0;
 321
 322       FD_ZERO(&rfds);
 323       FD_SET(xfd, &rfds);
 324
 325       if (! timerList.empty()) {
 326         const BTimer* const timer = timerList.top();
 327
 328         gettimeofday(&now, 0);
 329         tm = timer->timeRemaining(now);
 330
 331         timeout = &tm;
 332       }
 333
 334       select(xfd + 1, &rfds, 0, 0, timeout);
 335
 336       // check for timer timeout
 337       gettimeofday(&now, 0);
 338
 339       // there is a small chance for deadlock here:
 340       // *IF* the timer list keeps getting refreshed *AND* the time between
 341       // timer->start() and timer->shouldFire() is within the timer's period
 342       // then the timer will keep firing.  This should be VERY near impossible.
 343       while (! timerList.empty()) {
 344         BTimer *timer = timerList.top();
 345         if (! timer->shouldFire(now))
 346           break;
 347
 348         timerList.pop();
 349
 350         timer->fireTimeout();
 351         timer->halt();
 352         if (timer->isRecurring())
 353           timer->start();
 354       }
 355     }
 356   }
 357 }
 358
 359
 360 void BaseDisplay::addTimer(BTimer *timer) {
 361   if (! timer) return;
 362
 363   timerList.push(timer);
 364 }
 365
 366
 367 void BaseDisplay::removeTimer(BTimer *timer) {
 368   timerList.release(timer);
 369 }
 370
 371
 372 /*
 373  * Grabs a button, but also grabs the button in every possible combination
 374  * with the keyboard lock keys, so that they do not cancel out the event.
 375
 376  * if allow_scroll_lock is true then only the top half of the lock mask
 377  * table is used and scroll lock is ignored.  This value defaults to false.
 378  */
 379 void BaseDisplay::grabButton(unsigned int button, unsigned int modifiers,
 380                              Window grab_window, bool owner_events,
 381                              unsigned int event_mask, int pointer_mode,
 382                              int keyboard_mode, Window confine_to,
 383                              Cursor cursor, bool allow_scroll_lock) const {
 384   unsigned int length = (allow_scroll_lock) ? MaskListLength / 2:
 385                                               MaskListLength;
 386   for (size_t cnt = 0; cnt < length; ++cnt)
 387     XGrabButton(display, button, modifiers | MaskList[cnt], grab_window,
 388                 owner_events, event_mask, pointer_mode, keyboard_mode,
 389                 confine_to, cursor);
 390 }
 391
 392
 393 /*
 394  * Releases the grab on a button, and ungrabs all possible combinations of the
 395  * keyboard lock keys.
 396  */
 397 void BaseDisplay::ungrabButton(unsigned int button, unsigned int modifiers,
 398                                Window grab_window) const {
 399   for (size_t cnt = 0; cnt < MaskListLength; ++cnt)
 400     XUngrabButton(display, button, modifiers | MaskList[cnt], grab_window);
 401 }
 402
 403
 404 const ScreenInfo* BaseDisplay::getScreenInfo(unsigned int s) const {
 405   if (s < screenInfoList.size())
 406     return &screenInfoList[s];
 407   return (const ScreenInfo*) 0;
 408 }
 409
 410
 411 BGCCache* BaseDisplay::gcCache(void) const {
 412   if (! gccache)
 413     gccache = new BGCCache(this, screenInfoList.size());
 414
 415   return gccache;
 416 }
 417
 418
 419 ScreenInfo::ScreenInfo(BaseDisplay *d, unsigned int num) {
 420   basedisplay = d;
 421   screen_number = num;
 422
 423   root_window = RootWindow(basedisplay->getXDisplay(), screen_number);
 424
 425   rect.setSize(WidthOfScreen(ScreenOfDisplay(basedisplay->getXDisplay(),
 426                                              screen_number)),
 427                HeightOfScreen(ScreenOfDisplay(basedisplay->getXDisplay(),
 428                                               screen_number)));
 429   /*
 430     If the default depth is at least 8 we will use that,
 431     otherwise we try to find the largest TrueColor visual.
 432     Preference is given to 24 bit over larger depths if 24 bit is an option.
 433   */
 434
 435   depth = DefaultDepth(basedisplay->getXDisplay(), screen_number);
 436   visual = DefaultVisual(basedisplay->getXDisplay(), screen_number);
 437   colormap = DefaultColormap(basedisplay->getXDisplay(), screen_number);
 438
 439   if (depth < 8) {
 440     // search for a TrueColor Visual... if we can't find one...
 441     // we will use the default visual for the screen
 442     XVisualInfo vinfo_template, *vinfo_return;
 443     int vinfo_nitems;
 444     int best = -1;
 445
 446     vinfo_template.screen = screen_number;
 447     vinfo_template.c_class = TrueColor;
 448
 449     vinfo_return = XGetVisualInfo(basedisplay->getXDisplay(),
 450                                   VisualScreenMask | VisualClassMask,
 451                                   &vinfo_template, &vinfo_nitems);
 452     if (vinfo_return) {
 453       int max_depth = 1;
 454       for (int i = 0; i < vinfo_nitems; ++i) {
 455         if (vinfo_return[i].depth > max_depth) {
 456           if (max_depth == 24 && vinfo_return[i].depth > 24)
 457             break;          // prefer 24 bit over 32
 458           max_depth = vinfo_return[i].depth;
 459           best = i;
 460         }
 461       }
 462       if (max_depth < depth) best = -1;
 463     }
 464
 465     if (best != -1) {
 466       depth = vinfo_return[best].depth;
 467       visual = vinfo_return[best].visual;
 468       colormap = XCreateColormap(basedisplay->getXDisplay(), root_window,
 469                                  visual, AllocNone);
 470     }
 471
 472     XFree(vinfo_return);
 473   }
 474
 475   // get the default display string and strip the screen number
 476   string default_string = DisplayString(basedisplay->getXDisplay());
 477   const string::size_type pos = default_string.rfind(".");
 478   if (pos != string::npos)
 479     default_string.resize(pos);
 480
 481   display_string = string("DISPLAY=") + default_string + '.' +
 482     itostring(static_cast<unsigned long>(screen_number));
 483
 484 #ifdef    XINERAMA
 485   xinerama_active = False;
 486
 487   if (d->hasXineramaExtensions()) {
 488     if (d->getXineramaMajorVersion() == 1) {
 489       // we know the version 1(.1?) protocol
 490
 491       /*
 492          in this version of Xinerama, we can't query on a per-screen basis, but
 493          in future versions we should be able, so the 'activeness' is checked
 494          on a pre-screen basis anyways.
 495       */
 496       if (XineramaIsActive(d->getXDisplay())) {
 497         /*
 498            If Xinerama is being used, there there is only going to be one screen
 499            present. We still, of course, want to use the screen class, but that
 500            is why no screen number is used in this function call. There should
 501            never be more than one screen present with Xinerama active.
 502         */
 503         int num;
 504         XineramaScreenInfo *info = XineramaQueryScreens(d->getXDisplay(), &num);
 505         if (num > 0 && info) {
 506           xinerama_areas.reserve(num);
 507           for (int i = 0; i < num; ++i) {
 508             xinerama_areas.push_back(Rect(info[i].x_org, info[i].y_org,
 509                                           info[i].width, info[i].height));
 510           }
 511           XFree(info);
 512
 513           // if we can't find any xinerama regions, then we act as if it is not
 514           // active, even though it said it was
 515           xinerama_active = True;
 516         }
 517       }
 518     }
 519   }
 520 #endif // XINERAMA
 521 }