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 "i18n.hh"
  89 #include "BaseDisplay.hh"
  90 #include "GCCache.hh"
  91 #include "Timer.hh"
  92 #include "Util.hh"
  93
  94
  95 // X error handler to handle any and all X errors while the application is
  96 // running
  97 static bool internal_error = False;
  98
  99 BaseDisplay *base_display;
 100
 101 static int handleXErrors(Display *d, XErrorEvent *e) {
 102 #ifdef    DEBUG
 103   char errtxt[128];
 104
 105   XGetErrorText(d, e->error_code, errtxt, 128);
 106   fprintf(stderr,
 107           i18n(BaseDisplaySet, BaseDisplayXError,
 108                "%s:  X error: %s(%d) opcodes %d/%d\n  resource 0x%lx\n"),
 109           base_display->getApplicationName(), errtxt, e->error_code,
 110           e->request_code, e->minor_code, e->resourceid);
 111 #else
 112   // shutup gcc
 113   (void) d;
 114   (void) e;
 115 #endif // DEBUG
 116
 117   if (internal_error) abort();
 118
 119   return(False);
 120 }
 121
 122
 123 // signal handler to allow for proper and gentle shutdown
 124
 125 #ifndef   HAVE_SIGACTION
 126 static RETSIGTYPE signalhandler(int sig) {
 127 #else //  HAVE_SIGACTION
 128 static void signalhandler(int sig) {
 129 #endif // HAVE_SIGACTION
 130
 131   static int re_enter = 0;
 132
 133   switch (sig) {
 134   case SIGCHLD:
 135     int status;
 136     waitpid(-1, &status, WNOHANG | WUNTRACED);
 137
 138 #ifndef   HAVE_SIGACTION
 139     // assume broken, braindead sysv signal semantics
 140     signal(SIGCHLD, (RETSIGTYPE (*)(int)) signalhandler);
 141 #endif // HAVE_SIGACTION
 142
 143     break;
 144
 145   default:
 146     if (base_display->handleSignal(sig)) {
 147
 148 #ifndef   HAVE_SIGACTION
 149       // assume broken, braindead sysv signal semantics
 150       signal(sig, (RETSIGTYPE (*)(int)) signalhandler);
 151 #endif // HAVE_SIGACTION
 152
 153       return;
 154     }
 155
 156     fprintf(stderr, i18n(BaseDisplaySet, BaseDisplaySignalCaught,
 157                          "%s:  signal %d caught\n"),
 158             base_display->getApplicationName(), sig);
 159
 160     if (! base_display->isStartup() && ! re_enter) {
 161       internal_error = True;
 162
 163       re_enter = 1;
 164       fprintf(stderr, i18n(BaseDisplaySet, BaseDisplayShuttingDown,
 165                            "shutting down\n"));
 166       base_display->shutdown();
 167     }
 168
 169     if (sig != SIGTERM && sig != SIGINT) {
 170       fprintf(stderr, i18n(BaseDisplaySet, BaseDisplayAborting,
 171                            "aborting... dumping core\n"));
 172       abort();
 173     }
 174
 175     exit(0);
 176
 177     break;
 178   }
 179 }
 180
 181
 182 BaseDisplay::BaseDisplay(const char *app_name, const char *dpy_name) {
 183   application_name = app_name;
 184
 185   run_state = STARTUP;
 186
 187   ::base_display = this;
 188
 189 #ifdef    HAVE_SIGACTION
 190   struct sigaction action;
 191
 192   action.sa_handler = signalhandler;
 193   action.sa_mask = sigset_t();
 194   action.sa_flags = SA_NOCLDSTOP | SA_NODEFER;
 195
 196   sigaction(SIGPIPE, &action, NULL);
 197   sigaction(SIGSEGV, &action, NULL);
 198   sigaction(SIGFPE, &action, NULL);
 199   sigaction(SIGTERM, &action, NULL);
 200   sigaction(SIGINT, &action, NULL);
 201   sigaction(SIGCHLD, &action, NULL);
 202   sigaction(SIGHUP, &action, NULL);
 203   sigaction(SIGUSR1, &action, NULL);
 204   sigaction(SIGUSR2, &action, NULL);
 205 #else // !HAVE_SIGACTION
 206   signal(SIGPIPE, (RETSIGTYPE (*)(int)) signalhandler);
 207   signal(SIGSEGV, (RETSIGTYPE (*)(int)) signalhandler);
 208   signal(SIGFPE, (RETSIGTYPE (*)(int)) signalhandler);
 209   signal(SIGTERM, (RETSIGTYPE (*)(int)) signalhandler);
 210   signal(SIGINT, (RETSIGTYPE (*)(int)) signalhandler);
 211   signal(SIGUSR1, (RETSIGTYPE (*)(int)) signalhandler);
 212   signal(SIGUSR2, (RETSIGTYPE (*)(int)) signalhandler);
 213   signal(SIGHUP, (RETSIGTYPE (*)(int)) signalhandler);
 214   signal(SIGCHLD, (RETSIGTYPE (*)(int)) signalhandler);
 215 #endif // HAVE_SIGACTION
 216
 217   if (! (display = XOpenDisplay(dpy_name))) {
 218     fprintf(stderr,
 219             i18n(BaseDisplaySet, BaseDisplayXConnectFail,
 220                "BaseDisplay::BaseDisplay: connection to X server failed.\n"));
 221     ::exit(2);
 222   } else if (fcntl(ConnectionNumber(display), F_SETFD, 1) == -1) {
 223     fprintf(stderr,
 224             i18n(BaseDisplaySet, BaseDisplayCloseOnExecFail,
 225                  "BaseDisplay::BaseDisplay: couldn't mark display connection "
 226                  "as close-on-exec\n"));
 227     ::exit(2);
 228   }
 229
 230   display_name = XDisplayName(dpy_name);
 231
 232 #ifdef    SHAPE
 233   shape.extensions = XShapeQueryExtension(display, &shape.event_basep,
 234                                           &shape.error_basep);
 235 #else // !SHAPE
 236   shape.extensions = False;
 237 #endif // SHAPE
 238
 239 #ifdef    XINERAMA
 240   if (XineramaQueryExtension(display, &xinerama.event_basep,
 241                              &xinerama.error_basep) &&
 242       XineramaQueryVersion(display, &xinerama.major, &xinerama.minor)) {
 243 #ifdef    DEBUG
 244     fprintf(stderr,
 245             "BaseDisplay::BaseDisplay: Found Xinerama version %d.%d\n",
 246             xinerama.major, xinerama.minor);
 247 #endif // DEBUG
 248     xinerama.extensions = True;
 249   } else {
 250     xinerama.extensions = False;
 251   }
 252 #endif // XINERAMA
 253
 254   XSetErrorHandler((XErrorHandler) handleXErrors);
 255
 256   screenInfoList.reserve(ScreenCount(display));
 257   for (int i = 0; i < ScreenCount(display); ++i)
 258     screenInfoList.push_back(ScreenInfo(this, i));
 259
 260   NumLockMask = ScrollLockMask = 0;
 261
 262   const XModifierKeymap* const modmap = XGetModifierMapping(display);
 263   if (modmap && modmap->max_keypermod > 0) {
 264     const int mask_table[] = {
 265       ShiftMask, LockMask, ControlMask, Mod1Mask,
 266       Mod2Mask, Mod3Mask, Mod4Mask, Mod5Mask
 267     };
 268     const size_t size = (sizeof(mask_table) / sizeof(mask_table[0])) *
 269       modmap->max_keypermod;
 270     // get the values of the keyboard lock modifiers
 271     // Note: Caps lock is not retrieved the same way as Scroll and Num lock
 272     // since it doesn't need to be.
 273     const KeyCode num_lock = XKeysymToKeycode(display, XK_Num_Lock);
 274     const KeyCode scroll_lock = XKeysymToKeycode(display, XK_Scroll_Lock);
 275
 276     for (size_t cnt = 0; cnt < size; ++cnt) {
 277       if (! modmap->modifiermap[cnt]) continue;
 278
 279       if (num_lock == modmap->modifiermap[cnt])
 280         NumLockMask = mask_table[cnt / modmap->max_keypermod];
 281       if (scroll_lock == modmap->modifiermap[cnt])
 282         ScrollLockMask = mask_table[cnt / modmap->max_keypermod];
 283     }
 284   }
 285
 286   MaskList[0] = 0;
 287   MaskList[1] = LockMask;
 288   MaskList[2] = NumLockMask;
 289   MaskList[3] = LockMask | NumLockMask;
 290   MaskList[4] = ScrollLockMask;
 291   MaskList[5] = ScrollLockMask | LockMask;
 292   MaskList[6] = ScrollLockMask | NumLockMask;
 293   MaskList[7] = ScrollLockMask | LockMask | NumLockMask;
 294   MaskListLength = sizeof(MaskList) / sizeof(MaskList[0]);
 295
 296   if (modmap) XFreeModifiermap(const_cast<XModifierKeymap*>(modmap));
 297
 298   gccache = (BGCCache *) 0;
 299 }
 300
 301
 302 BaseDisplay::~BaseDisplay(void) {
 303   delete gccache;
 304
 305   XCloseDisplay(display);
 306 }
 307
 308
 309 void BaseDisplay::eventLoop(void) {
 310   run();
 311
 312   const int xfd = ConnectionNumber(display);
 313
 314   while (run_state == RUNNING && ! internal_error) {
 315     if (XPending(display)) {
 316       XEvent e;
 317       XNextEvent(display, &e);
 318       process_event(&e);
 319     } else {
 320       fd_set rfds;
 321       timeval now, tm, *timeout = (timeval *) 0;
 322
 323       FD_ZERO(&rfds);
 324       FD_SET(xfd, &rfds);
 325
 326       if (! timerList.empty()) {
 327         const BTimer* const timer = timerList.top();
 328
 329         gettimeofday(&now, 0);
 330         tm = timer->timeRemaining(now);
 331
 332         timeout = &tm;
 333       }
 334
 335       select(xfd + 1, &rfds, 0, 0, timeout);
 336
 337       // check for timer timeout
 338       gettimeofday(&now, 0);
 339
 340       // there is a small chance for deadlock here:
 341       // *IF* the timer list keeps getting refreshed *AND* the time between
 342       // timer->start() and timer->shouldFire() is within the timer's period
 343       // then the timer will keep firing.  This should be VERY near impossible.
 344       while (! timerList.empty()) {
 345         BTimer *timer = timerList.top();
 346         if (! timer->shouldFire(now))
 347           break;
 348
 349         timerList.pop();
 350
 351         timer->fireTimeout();
 352         timer->halt();
 353         if (timer->isRecurring())
 354           timer->start();
 355       }
 356     }
 357   }
 358 }
 359
 360
 361 void BaseDisplay::addTimer(BTimer *timer) {
 362   if (! timer) return;
 363
 364   timerList.push(timer);
 365 }
 366
 367
 368 void BaseDisplay::removeTimer(BTimer *timer) {
 369   timerList.release(timer);
 370 }
 371
 372
 373 /*
 374  * Grabs a button, but also grabs the button in every possible combination
 375  * with the keyboard lock keys, so that they do not cancel out the event.
 376
 377  * if allow_scroll_lock is true then only the top half of the lock mask
 378  * table is used and scroll lock is ignored.  This value defaults to false.
 379  */
 380 void BaseDisplay::grabButton(unsigned int button, unsigned int modifiers,
 381                              Window grab_window, bool owner_events,
 382                              unsigned int event_mask, int pointer_mode,
 383                              int keyboard_mode, Window confine_to,
 384                              Cursor cursor, bool allow_scroll_lock) const {
 385   unsigned int length = (allow_scroll_lock) ? MaskListLength / 2:
 386                                               MaskListLength;
 387   for (size_t cnt = 0; cnt < length; ++cnt)
 388     XGrabButton(display, button, modifiers | MaskList[cnt], grab_window,
 389                 owner_events, event_mask, pointer_mode, keyboard_mode,
 390                 confine_to, cursor);
 391 }
 392
 393
 394 /*
 395  * Releases the grab on a button, and ungrabs all possible combinations of the
 396  * keyboard lock keys.
 397  */
 398 void BaseDisplay::ungrabButton(unsigned int button, unsigned int modifiers,
 399                                Window grab_window) const {
 400   for (size_t cnt = 0; cnt < MaskListLength; ++cnt)
 401     XUngrabButton(display, button, modifiers | MaskList[cnt], grab_window);
 402 }
 403
 404
 405 const ScreenInfo* BaseDisplay::getScreenInfo(unsigned int s) const {
 406   if (s < screenInfoList.size())
 407     return &screenInfoList[s];
 408   return (const ScreenInfo*) 0;
 409 }
 410
 411
 412 BGCCache* BaseDisplay::gcCache(void) const {
 413   if (! gccache)
 414     gccache = new BGCCache(this);
 415
 416   return gccache;
 417 }
 418
 419
 420 ScreenInfo::ScreenInfo(BaseDisplay *d, unsigned int num) {
 421   basedisplay = d;
 422   screen_number = num;
 423
 424   root_window = RootWindow(basedisplay->getXDisplay(), screen_number);
 425
 426   rect.setSize(WidthOfScreen(ScreenOfDisplay(basedisplay->getXDisplay(),
 427                                              screen_number)),
 428                HeightOfScreen(ScreenOfDisplay(basedisplay->getXDisplay(),
 429                                               screen_number)));
 430   /*
 431     If the default depth is at least 8 we will use that,
 432     otherwise we try to find the largest TrueColor visual.
 433     Preference is given to 24 bit over larger depths if 24 bit is an option.
 434   */
 435
 436   depth = DefaultDepth(basedisplay->getXDisplay(), screen_number);
 437   visual = DefaultVisual(basedisplay->getXDisplay(), screen_number);
 438   colormap = DefaultColormap(basedisplay->getXDisplay(), screen_number);
 439
 440   if (depth < 8) {
 441     // search for a TrueColor Visual... if we can't find one...
 442     // we will use the default visual for the screen
 443     XVisualInfo vinfo_template, *vinfo_return;
 444     int vinfo_nitems;
 445     int best = -1;
 446
 447     vinfo_template.screen = screen_number;
 448     vinfo_template.c_class = TrueColor;
 449
 450     vinfo_return = XGetVisualInfo(basedisplay->getXDisplay(),
 451                                   VisualScreenMask | VisualClassMask,
 452                                   &vinfo_template, &vinfo_nitems);
 453     if (vinfo_return) {
 454       int max_depth = 1;
 455       for (int i = 0; i < vinfo_nitems; ++i) {
 456         if (vinfo_return[i].depth > max_depth) {
 457           if (max_depth == 24 && vinfo_return[i].depth > 24)
 458             break;          // prefer 24 bit over 32
 459           max_depth = vinfo_return[i].depth;
 460           best = i;
 461         }
 462       }
 463       if (max_depth < depth) best = -1;
 464     }
 465
 466     if (best != -1) {
 467       depth = vinfo_return[best].depth;
 468       visual = vinfo_return[best].visual;
 469       colormap = XCreateColormap(basedisplay->getXDisplay(), root_window,
 470                                  visual, AllocNone);
 471     }
 472
 473     XFree(vinfo_return);
 474   }
 475
 476   // get the default display string and strip the screen number
 477   string default_string = DisplayString(basedisplay->getXDisplay());
 478   const string::size_type pos = default_string.rfind(".");
 479   if (pos != string::npos)
 480     default_string.resize(pos);
 481
 482   display_string = string("DISPLAY=") + default_string + '.' +
 483     itostring(static_cast<unsigned long>(screen_number));
 484
 485 #ifdef    XINERAMA
 486   xinerama_active = False;
 487
 488   if (d->hasXineramaExtensions()) {
 489     if (d->getXineramaMajorVersion() == 1) {
 490       // we know the version 1(.1?) protocol
 491
 492       /*
 493          in this version of Xinerama, we can't query on a per-screen basis, but
 494          in future versions we should be able, so the 'activeness' is checked
 495          on a pre-screen basis anyways.
 496       */
 497       if (XineramaIsActive(d->getXDisplay())) {
 498         /*
 499            If Xinerama is being used, there there is only going to be one screen
 500            present. We still, of course, want to use the screen class, but that
 501            is why no screen number is used in this function call. There should
 502            never be more than one screen present with Xinerama active.
 503         */
 504         int num;
 505         XineramaScreenInfo *info = XineramaQueryScreens(d->getXDisplay(), &num);
 506         if (num > 0 && info) {
 507           xinerama_areas.reserve(num);
 508           for (int i = 0; i < num; ++i) {
 509             xinerama_areas.push_back(Rect(info[i].x_org, info[i].y_org,
 510                                           info[i].width, info[i].height));
 511           }
 512           XFree(info);
 513
 514           // if we can't find any xinerama regions, then we act as if it is not
 515           // active, even though it said it was
 516           xinerama_active = True;
 517         }
 518       }
 519     }
 520   }
 521 #endif // XINERAMA
 522 }