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   xinerama.extensions = False;
 240 #ifdef    XINERAMA
 241   if (XineramaQueryExtension(display, &xinerama.event_basep,
 242                              &xinerama.error_basep)) {
 243     if (XineramaQueryVersion(display, &xinerama.major,
 244                              &xinerama.minor)) {
 245 #ifdef    DEBUG
 246       fprintf(stderr,
 247               "BaseDisplay::BaseDisplay: Found Xinerama version %d.%d\n",
 248               xinerama.major, xinerama.minor);
 249 #endif // DEBUG
 250       xinerama.extensions = True;
 251     }
 252   }
 253 #endif // XINERAMA
 254
 255   XSetErrorHandler((XErrorHandler) handleXErrors);
 256
 257   screenInfoList.reserve(ScreenCount(display));
 258   for (int i = 0; i < ScreenCount(display); ++i)
 259     screenInfoList.push_back(ScreenInfo(this, i));
 260
 261   NumLockMask = ScrollLockMask = 0;
 262
 263   const XModifierKeymap* const modmap = XGetModifierMapping(display);
 264   if (modmap && modmap->max_keypermod > 0) {
 265     const int mask_table[] = {
 266       ShiftMask, LockMask, ControlMask, Mod1Mask,
 267       Mod2Mask, Mod3Mask, Mod4Mask, Mod5Mask
 268     };
 269     const size_t size = (sizeof(mask_table) / sizeof(mask_table[0])) *
 270       modmap->max_keypermod;
 271     // get the values of the keyboard lock modifiers
 272     // Note: Caps lock is not retrieved the same way as Scroll and Num lock
 273     // since it doesn't need to be.
 274     const KeyCode num_lock = XKeysymToKeycode(display, XK_Num_Lock);
 275     const KeyCode scroll_lock = XKeysymToKeycode(display, XK_Scroll_Lock);
 276
 277     for (size_t cnt = 0; cnt < size; ++cnt) {
 278       if (! modmap->modifiermap[cnt]) continue;
 279
 280       if (num_lock == modmap->modifiermap[cnt])
 281         NumLockMask = mask_table[cnt / modmap->max_keypermod];
 282       if (scroll_lock == modmap->modifiermap[cnt])
 283         ScrollLockMask = mask_table[cnt / modmap->max_keypermod];
 284     }
 285   }
 286
 287   MaskList[0] = 0;
 288   MaskList[1] = LockMask;
 289   MaskList[2] = NumLockMask;
 290   MaskList[3] = LockMask | NumLockMask;
 291   MaskList[4] = ScrollLockMask;
 292   MaskList[5] = ScrollLockMask | LockMask;
 293   MaskList[6] = ScrollLockMask | NumLockMask;
 294   MaskList[7] = ScrollLockMask | LockMask | NumLockMask;
 295   MaskListLength = sizeof(MaskList) / sizeof(MaskList[0]);
 296
 297   if (modmap) XFreeModifiermap(const_cast<XModifierKeymap*>(modmap));
 298
 299   gccache = (BGCCache *) 0;
 300 }
 301
 302
 303 BaseDisplay::~BaseDisplay(void) {
 304   delete gccache;
 305
 306   XCloseDisplay(display);
 307 }
 308
 309
 310 void BaseDisplay::eventLoop(void) {
 311   run();
 312
 313   const int xfd = ConnectionNumber(display);
 314
 315   while (run_state == RUNNING && ! internal_error) {
 316     if (XPending(display)) {
 317       XEvent e;
 318       XNextEvent(display, &e);
 319       process_event(&e);
 320     } else {
 321       fd_set rfds;
 322       timeval now, tm, *timeout = (timeval *) 0;
 323
 324       FD_ZERO(&rfds);
 325       FD_SET(xfd, &rfds);
 326
 327       if (! timerList.empty()) {
 328         const BTimer* const timer = timerList.top();
 329
 330         gettimeofday(&now, 0);
 331         tm = timer->timeRemaining(now);
 332
 333         timeout = &tm;
 334       }
 335
 336       select(xfd + 1, &rfds, 0, 0, timeout);
 337
 338       // check for timer timeout
 339       gettimeofday(&now, 0);
 340
 341       // there is a small chance for deadlock here:
 342       // *IF* the timer list keeps getting refreshed *AND* the time between
 343       // timer->start() and timer->shouldFire() is within the timer's period
 344       // then the timer will keep firing.  This should be VERY near impossible.
 345       while (! timerList.empty()) {
 346         BTimer *timer = timerList.top();
 347         if (! timer->shouldFire(now))
 348           break;
 349
 350         timerList.pop();
 351
 352         timer->fireTimeout();
 353         timer->halt();
 354         if (timer->isRecurring())
 355           timer->start();
 356       }
 357     }
 358   }
 359 }
 360
 361
 362 void BaseDisplay::addTimer(BTimer *timer) {
 363   if (! timer) return;
 364
 365   timerList.push(timer);
 366 }
 367
 368
 369 void BaseDisplay::removeTimer(BTimer *timer) {
 370   timerList.release(timer);
 371 }
 372
 373
 374 /*
 375  * Grabs a button, but also grabs the button in every possible combination
 376  * with the keyboard lock keys, so that they do not cancel out the event.
 377
 378  * if allow_scroll_lock is true then only the top half of the lock mask
 379  * table is used and scroll lock is ignored.  This value defaults to false.
 380  */
 381 void BaseDisplay::grabButton(unsigned int button, unsigned int modifiers,
 382                              Window grab_window, bool owner_events,
 383                              unsigned int event_mask, int pointer_mode,
 384                              int keyboard_mode, Window confine_to,
 385                              Cursor cursor, bool allow_scroll_lock) const {
 386   unsigned int length = (allow_scroll_lock) ? MaskListLength / 2:
 387                                               MaskListLength;
 388   for (size_t cnt = 0; cnt < length; ++cnt)
 389     XGrabButton(display, button, modifiers | MaskList[cnt], grab_window,
 390                 owner_events, event_mask, pointer_mode, keyboard_mode,
 391                 confine_to, cursor);
 392 }
 393
 394
 395 /*
 396  * Releases the grab on a button, and ungrabs all possible combinations of the
 397  * keyboard lock keys.
 398  */
 399 void BaseDisplay::ungrabButton(unsigned int button, unsigned int modifiers,
 400                                Window grab_window) const {
 401   for (size_t cnt = 0; cnt < MaskListLength; ++cnt)
 402     XUngrabButton(display, button, modifiers | MaskList[cnt], grab_window);
 403 }
 404
 405
 406 const ScreenInfo* BaseDisplay::getScreenInfo(unsigned int s) const {
 407   if (s < screenInfoList.size())
 408     return &screenInfoList[s];
 409   return (const ScreenInfo*) 0;
 410 }
 411
 412
 413 BGCCache* BaseDisplay::gcCache(void) const {
 414   if (! gccache)
 415     gccache = new BGCCache(this);
 416
 417   return gccache;
 418 }
 419
 420
 421 ScreenInfo::ScreenInfo(BaseDisplay *d, unsigned int num) {
 422   basedisplay = d;
 423   screen_number = num;
 424
 425   root_window = RootWindow(basedisplay->getXDisplay(), screen_number);
 426
 427   rect.setSize(WidthOfScreen(ScreenOfDisplay(basedisplay->getXDisplay(),
 428                                              screen_number)),
 429                HeightOfScreen(ScreenOfDisplay(basedisplay->getXDisplay(),
 430                                               screen_number)));
 431   /*
 432     If the default depth is at least 8 we will use that,
 433     otherwise we try to find the largest TrueColor visual.
 434     Preference is given to 24 bit over larger depths if 24 bit is an option.
 435   */
 436
 437   depth = DefaultDepth(basedisplay->getXDisplay(), screen_number);
 438   visual = DefaultVisual(basedisplay->getXDisplay(), screen_number);
 439   colormap = DefaultColormap(basedisplay->getXDisplay(), screen_number);
 440
 441   if (depth < 8) {
 442     // search for a TrueColor Visual... if we can't find one...
 443     // we will use the default visual for the screen
 444     XVisualInfo vinfo_template, *vinfo_return;
 445     int vinfo_nitems;
 446     int best = -1;
 447
 448     vinfo_template.screen = screen_number;
 449     vinfo_template.c_class = TrueColor;
 450
 451     vinfo_return = XGetVisualInfo(basedisplay->getXDisplay(),
 452                                   VisualScreenMask | VisualClassMask,
 453                                   &vinfo_template, &vinfo_nitems);
 454     if (vinfo_return) {
 455       int max_depth = 1;
 456       for (int i = 0; i < vinfo_nitems; ++i) {
 457         if (vinfo_return[i].depth > max_depth) {
 458           if (max_depth == 24 && vinfo_return[i].depth > 24)
 459             break;          // prefer 24 bit over 32
 460           max_depth = vinfo_return[i].depth;
 461           best = i;
 462         }
 463       }
 464       if (max_depth < depth) best = -1;
 465     }
 466
 467     if (best != -1) {
 468       depth = vinfo_return[best].depth;
 469       visual = vinfo_return[best].visual;
 470       colormap = XCreateColormap(basedisplay->getXDisplay(), root_window,
 471                                  visual, AllocNone);
 472     }
 473
 474     XFree(vinfo_return);
 475   }
 476
 477   // get the default display string and strip the screen number
 478   string default_string = DisplayString(basedisplay->getXDisplay());
 479   const string::size_type pos = default_string.rfind(".");
 480   if (pos != string::npos)
 481     default_string.resize(pos);
 482
 483   display_string = string("DISPLAY=") + default_string + '.' +
 484     itostring(static_cast<unsigned long>(screen_number));
 485
 486 #ifdef    XINERAMA
 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       xinerama_active = 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 is
 500          why no screen number is used in this function call. There should never
 501          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         for (int i = 0; i < num; ++i) {
 507           xinerama_areas.push_back(Rect(info[i].x_org, info[i].y_org,
 508                                         info[i].width, info[i].height));
 509         }
 510         XFree(info);
 511       }
 512     }
 513   }
 514 #endif // XINERAMA
 515 }