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

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