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    HAVE_FCNTL_H
  39 #  include <fcntl.h>
  40 #endif // HAVE_FCNTL_H
  41
  42 #ifdef    HAVE_STDIO_H
  43 #  include <stdio.h>
  44 #endif // HAVE_STDIO_H
  45
  46 #ifdef HAVE_STDLIB_H
  47 #  include <stdlib.h>
  48 #endif // HAVE_STDLIB_H
  49
  50 #ifdef HAVE_STRING_H
  51 #  include <string.h>
  52 #endif // HAVE_STRING_H
  53
  54 #ifdef    HAVE_UNISTD_H
  55 #  include <sys/types.h>
  56 #  include <unistd.h>
  57 #endif // HAVE_UNISTD_H
  58
  59 #ifdef    HAVE_SYS_SELECT_H
  60 #  include <sys/select.h>
  61 #endif // HAVE_SYS_SELECT_H
  62
  63 #ifdef    HAVE_SIGNAL_H
  64 #  include <signal.h>
  65 #endif // HAVE_SIGNAL_H
  66
  67 #ifndef   SA_NODEFER
  68 #  ifdef   SA_INTERRUPT
  69 #    define SA_NODEFER SA_INTERRUPT
  70 #  else // !SA_INTERRUPT
  71 #    define SA_NODEFER (0)
  72 #  endif // SA_INTERRUPT
  73 #endif // SA_NODEFER
  74
  75 #ifdef    HAVE_SYS_WAIT_H
  76 #  include <sys/types.h>
  77 #  include <sys/wait.h>
  78 #endif // HAVE_SYS_WAIT_H
  79 }
  80
  81 #include <string>
  82 using std::string;
  83
  84 #include "i18n.hh"
  85 #include "BaseDisplay.hh"
  86 #include "GCCache.hh"
  87 #include "Timer.hh"
  88 #include "Util.hh"
  89
  90
  91 // X error handler to handle any and all X errors while the application is
  92 // running
  93 static bool internal_error = False;
  94
  95 BaseDisplay *base_display;
  96
  97 static int handleXErrors(Display *d, XErrorEvent *e) {
  98 #ifdef    DEBUG
  99   char errtxt[128];
 100
 101   XGetErrorText(d, e->error_code, errtxt, 128);
 102   fprintf(stderr,
 103           i18n(BaseDisplaySet, BaseDisplayXError,
 104                "%s:  X error: %s(%d) opcodes %d/%d\n  resource 0x%lx\n"),
 105           base_display->getApplicationName(), errtxt, e->error_code,
 106           e->request_code, e->minor_code, e->resourceid);
 107 #else
 108   // shutup gcc
 109   (void) d;
 110   (void) e;
 111 #endif // DEBUG
 112
 113   if (internal_error) abort();
 114
 115   return(False);
 116 }
 117
 118
 119 // signal handler to allow for proper and gentle shutdown
 120
 121 #ifndef   HAVE_SIGACTION
 122 static RETSIGTYPE signalhandler(int sig) {
 123 #else //  HAVE_SIGACTION
 124 static void signalhandler(int sig) {
 125 #endif // HAVE_SIGACTION
 126
 127   static int re_enter = 0;
 128
 129   switch (sig) {
 130   case SIGCHLD:
 131     int status;
 132     waitpid(-1, &status, WNOHANG | WUNTRACED);
 133
 134 #ifndef   HAVE_SIGACTION
 135     // assume broken, braindead sysv signal semantics
 136     signal(SIGCHLD, (RETSIGTYPE (*)(int)) signalhandler);
 137 #endif // HAVE_SIGACTION
 138
 139     break;
 140
 141   default:
 142     if (base_display->handleSignal(sig)) {
 143
 144 #ifndef   HAVE_SIGACTION
 145       // assume broken, braindead sysv signal semantics
 146       signal(sig, (RETSIGTYPE (*)(int)) signalhandler);
 147 #endif // HAVE_SIGACTION
 148
 149       return;
 150     }
 151
 152     fprintf(stderr, i18n(BaseDisplaySet, BaseDisplaySignalCaught,
 153                          "%s:  signal %d caught\n"),
 154             base_display->getApplicationName(), sig);
 155
 156     if (! base_display->isStartup() && ! re_enter) {
 157       internal_error = True;
 158
 159       re_enter = 1;
 160       fprintf(stderr, i18n(BaseDisplaySet, BaseDisplayShuttingDown,
 161                            "shutting down\n"));
 162       base_display->shutdown();
 163     }
 164
 165     if (sig != SIGTERM && sig != SIGINT) {
 166       fprintf(stderr, i18n(BaseDisplaySet, BaseDisplayAborting,
 167                            "aborting... dumping core\n"));
 168       abort();
 169     }
 170
 171     exit(0);
 172
 173     break;
 174   }
 175 }
 176
 177
 178 BaseDisplay::BaseDisplay(const char *app_name, const char *dpy_name) {
 179   application_name = app_name;
 180
 181   run_state = STARTUP;
 182
 183   ::base_display = this;
 184
 185 #ifdef    HAVE_SIGACTION
 186   struct sigaction action;
 187
 188   action.sa_handler = signalhandler;
 189   action.sa_mask = sigset_t();
 190   action.sa_flags = SA_NOCLDSTOP | SA_NODEFER;
 191
 192   sigaction(SIGPIPE, &action, NULL);
 193   sigaction(SIGSEGV, &action, NULL);
 194   sigaction(SIGFPE, &action, NULL);
 195   sigaction(SIGTERM, &action, NULL);
 196   sigaction(SIGINT, &action, NULL);
 197   sigaction(SIGCHLD, &action, NULL);
 198   sigaction(SIGHUP, &action, NULL);
 199   sigaction(SIGUSR1, &action, NULL);
 200   sigaction(SIGUSR2, &action, NULL);
 201 #else // !HAVE_SIGACTION
 202   signal(SIGPIPE, (RETSIGTYPE (*)(int)) signalhandler);
 203   signal(SIGSEGV, (RETSIGTYPE (*)(int)) signalhandler);
 204   signal(SIGFPE, (RETSIGTYPE (*)(int)) signalhandler);
 205   signal(SIGTERM, (RETSIGTYPE (*)(int)) signalhandler);
 206   signal(SIGINT, (RETSIGTYPE (*)(int)) signalhandler);
 207   signal(SIGUSR1, (RETSIGTYPE (*)(int)) signalhandler);
 208   signal(SIGUSR2, (RETSIGTYPE (*)(int)) signalhandler);
 209   signal(SIGHUP, (RETSIGTYPE (*)(int)) signalhandler);
 210   signal(SIGCHLD, (RETSIGTYPE (*)(int)) signalhandler);
 211 #endif // HAVE_SIGACTION
 212
 213   if (! (display = XOpenDisplay(dpy_name))) {
 214     fprintf(stderr,
 215             i18n(BaseDisplaySet, BaseDisplayXConnectFail,
 216                "BaseDisplay::BaseDisplay: connection to X server failed.\n"));
 217     ::exit(2);
 218   } else if (fcntl(ConnectionNumber(display), F_SETFD, 1) == -1) {
 219     fprintf(stderr,
 220             i18n(BaseDisplaySet, BaseDisplayCloseOnExecFail,
 221                  "BaseDisplay::BaseDisplay: couldn't mark display connection "
 222                  "as close-on-exec\n"));
 223     ::exit(2);
 224   }
 225
 226   display_name = XDisplayName(dpy_name);
 227
 228 #ifdef    SHAPE
 229   shape.extensions = XShapeQueryExtension(display, &shape.event_basep,
 230                                           &shape.error_basep);
 231 #else // !SHAPE
 232   shape.extensions = False;
 233 #endif // SHAPE
 234
 235   XSetErrorHandler((XErrorHandler) handleXErrors);
 236
 237   screenInfoList.reserve(ScreenCount(display));
 238   for (int i = 0; i < ScreenCount(display); ++i)
 239     screenInfoList.push_back(ScreenInfo(this, i));
 240
 241   NumLockMask = ScrollLockMask = 0;
 242
 243   const XModifierKeymap* const modmap = XGetModifierMapping(display);
 244   if (modmap && modmap->max_keypermod > 0) {
 245     const int mask_table[] = {
 246       ShiftMask, LockMask, ControlMask, Mod1Mask,
 247       Mod2Mask, Mod3Mask, Mod4Mask, Mod5Mask
 248     };
 249     const size_t size = (sizeof(mask_table) / sizeof(mask_table[0])) *
 250       modmap->max_keypermod;
 251     // get the values of the keyboard lock modifiers
 252     // Note: Caps lock is not retrieved the same way as Scroll and Num lock
 253     // since it doesn't need to be.
 254     const KeyCode num_lock = XKeysymToKeycode(display, XK_Num_Lock);
 255     const KeyCode scroll_lock = XKeysymToKeycode(display, XK_Scroll_Lock);
 256
 257     for (size_t cnt = 0; cnt < size; ++cnt) {
 258       if (! modmap->modifiermap[cnt]) continue;
 259
 260       if (num_lock == modmap->modifiermap[cnt])
 261         NumLockMask = mask_table[cnt / modmap->max_keypermod];
 262       if (scroll_lock == modmap->modifiermap[cnt])
 263         ScrollLockMask = mask_table[cnt / modmap->max_keypermod];
 264     }
 265   }
 266
 267   MaskList[0] = 0;
 268   MaskList[1] = LockMask;
 269   MaskList[2] = NumLockMask;
 270   MaskList[3] = LockMask | NumLockMask;
 271   MaskList[4] = ScrollLockMask;
 272   MaskList[5] = ScrollLockMask | LockMask;
 273   MaskList[6] = ScrollLockMask | NumLockMask;
 274   MaskList[7] = ScrollLockMask | LockMask | NumLockMask;
 275   MaskListLength = sizeof(MaskList) / sizeof(MaskList[0]);
 276
 277   if (modmap) XFreeModifiermap(const_cast<XModifierKeymap*>(modmap));
 278
 279   gccache = (BGCCache *) 0;
 280 }
 281
 282
 283 BaseDisplay::~BaseDisplay(void) {
 284   delete gccache;
 285
 286   XCloseDisplay(display);
 287 }
 288
 289
 290 void BaseDisplay::eventLoop(void) {
 291   run();
 292
 293   const int xfd = ConnectionNumber(display);
 294
 295   while (run_state == RUNNING && ! internal_error) {
 296     if (XPending(display)) {
 297       XEvent e;
 298       XNextEvent(display, &e);
 299       process_event(&e);
 300     } else {
 301       fd_set rfds;
 302       timeval now, tm, *timeout = (timeval *) 0;
 303
 304       FD_ZERO(&rfds);
 305       FD_SET(xfd, &rfds);
 306
 307       if (! timerList.empty()) {
 308         const BTimer* const timer = timerList.top();
 309
 310         gettimeofday(&now, 0);
 311         tm = timer->timeRemaining(now);
 312
 313         timeout = &tm;
 314       }
 315
 316       select(xfd + 1, &rfds, 0, 0, timeout);
 317
 318       // check for timer timeout
 319       gettimeofday(&now, 0);
 320
 321       // there is a small chance for deadlock here:
 322       // *IF* the timer list keeps getting refreshed *AND* the time between
 323       // timer->start() and timer->shouldFire() is within the timer's period
 324       // then the timer will keep firing.  This should be VERY near impossible.
 325       while (! timerList.empty()) {
 326         BTimer *timer = timerList.top();
 327         if (! timer->shouldFire(now))
 328           break;
 329
 330         timerList.pop();
 331
 332         timer->fireTimeout();
 333         timer->halt();
 334         if (timer->isRecurring())
 335           timer->start();
 336       }
 337     }
 338   }
 339 }
 340
 341
 342 void BaseDisplay::addTimer(BTimer *timer) {
 343   if (! timer) return;
 344
 345   timerList.push(timer);
 346 }
 347
 348
 349 void BaseDisplay::removeTimer(BTimer *timer) {
 350   timerList.release(timer);
 351 }
 352
 353
 354 /*
 355  * Grabs a button, but also grabs the button in every possible combination
 356  * with the keyboard lock keys, so that they do not cancel out the event.
 357
 358  * if allow_scroll_lock is true then only the top half of the lock mask
 359  * table is used and scroll lock is ignored.  This value defaults to false.
 360  */
 361 void BaseDisplay::grabButton(unsigned int button, unsigned int modifiers,
 362                              Window grab_window, bool owner_events,
 363                              unsigned int event_mask, int pointer_mode,
 364                              int keyboard_mode, Window confine_to,
 365                              Cursor cursor, bool allow_scroll_lock) const {
 366   unsigned int length = (allow_scroll_lock) ? MaskListLength / 2:
 367                                               MaskListLength;
 368   for (size_t cnt = 0; cnt < length; ++cnt)
 369     XGrabButton(display, button, modifiers | MaskList[cnt], grab_window,
 370                 owner_events, event_mask, pointer_mode, keyboard_mode,
 371                 confine_to, cursor);
 372 }
 373
 374
 375 /*
 376  * Releases the grab on a button, and ungrabs all possible combinations of the
 377  * keyboard lock keys.
 378  */
 379 void BaseDisplay::ungrabButton(unsigned int button, unsigned int modifiers,
 380                                Window grab_window) const {
 381   for (size_t cnt = 0; cnt < MaskListLength; ++cnt)
 382     XUngrabButton(display, button, modifiers | MaskList[cnt], grab_window);
 383 }
 384
 385
 386 const ScreenInfo* BaseDisplay::getScreenInfo(unsigned int s) const {
 387   if (s < screenInfoList.size())
 388     return &screenInfoList[s];
 389   return (const ScreenInfo*) 0;
 390 }
 391
 392
 393 BGCCache* BaseDisplay::gcCache(void) const {
 394   if (! gccache)
 395     gccache = new BGCCache(this);
 396
 397   return gccache;
 398 }
 399
 400
 401 ScreenInfo::ScreenInfo(BaseDisplay *d, unsigned int num) {
 402   basedisplay = d;
 403   screen_number = num;
 404
 405   root_window = RootWindow(basedisplay->getXDisplay(), screen_number);
 406
 407   rect.setSize(WidthOfScreen(ScreenOfDisplay(basedisplay->getXDisplay(),
 408                                              screen_number)),
 409                HeightOfScreen(ScreenOfDisplay(basedisplay->getXDisplay(),
 410                                               screen_number)));
 411   /*
 412     If the default depth is at least 8 we will use that,
 413     otherwise we try to find the largest TrueColor visual.
 414     Preference is given to 24 bit over larger depths if 24 bit is an option.
 415   */
 416
 417   depth = DefaultDepth(basedisplay->getXDisplay(), screen_number);
 418   visual = DefaultVisual(basedisplay->getXDisplay(), screen_number);
 419   colormap = DefaultColormap(basedisplay->getXDisplay(), screen_number);
 420
 421   if (depth < 8) {
 422     // search for a TrueColor Visual... if we can't find one...
 423     // we will use the default visual for the screen
 424     XVisualInfo vinfo_template, *vinfo_return;
 425     int vinfo_nitems;
 426     int best = -1;
 427
 428     vinfo_template.screen = screen_number;
 429     vinfo_template.c_class = TrueColor;
 430
 431     vinfo_return = XGetVisualInfo(basedisplay->getXDisplay(),
 432                                   VisualScreenMask | VisualClassMask,
 433                                   &vinfo_template, &vinfo_nitems);
 434     if (vinfo_return) {
 435       int max_depth = 1;
 436       for (int i = 0; i < vinfo_nitems; ++i) {
 437         if (vinfo_return[i].depth > max_depth) {
 438           if (max_depth == 24 && vinfo_return[i].depth > 24)
 439             break;          // prefer 24 bit over 32
 440           max_depth = vinfo_return[i].depth;
 441           best = i;
 442         }
 443       }
 444       if (max_depth < depth) best = -1;
 445     }
 446
 447     if (best != -1) {
 448       depth = vinfo_return[best].depth;
 449       visual = vinfo_return[best].visual;
 450       colormap = XCreateColormap(basedisplay->getXDisplay(), root_window,
 451                                  visual, AllocNone);
 452     }
 453
 454     XFree(vinfo_return);
 455   }
 456
 457   // get the default display string and strip the screen number
 458   string default_string = DisplayString(basedisplay->getXDisplay());
 459   const string::size_type pos = default_string.rfind(".");
 460   if (pos != string::npos)
 461     default_string.resize(pos);
 462
 463   display_string = string("DISPLAY=") + default_string + '.' +
 464     itostring(static_cast<unsigned long>(screen_number));
 465 }