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 #ifdef    HAVE_SYS_WAIT_H
  51 #  include <sys/types.h>
  52 #  include <sys/wait.h>
  53 #endif // HAVE_SYS_WAIT_H
  54 }
  55
  56 #include <string>
  57 using std::string;
  58
  59 #include "basedisplay.hh"
  60 #include "gccache.hh"
  61 #include "timer.hh"
  62 #include "util.hh"
  63
  64
  65 // X error handler to handle any and all X errors while the application is
  66 // running
  67 static bool internal_error = False;
  68
  69 BaseDisplay *base_display;
  70
  71 static int handleXErrors(Display *d, XErrorEvent *e) {
  72 #ifdef    DEBUG
  73   char errtxt[128];
  74
  75   XGetErrorText(d, e->error_code, errtxt, 128); // XXX: use this!!
  76   fprintf(stderr, "%s:  X error: %s(%d) opcodes %d/%d\n  resource 0x%lx\n",
  77           base_display->getApplicationName(), errtxt, e->error_code,
  78           e->request_code, e->minor_code, e->resourceid);
  79 #else
  80   // shutup gcc
  81   (void) d;
  82   (void) e;
  83 #endif // DEBUG
  84
  85   if (internal_error) abort();
  86
  87   return(False);
  88 }
  89
  90
  91 // signal handler to allow for proper and gentle shutdown
  92
  93 static void signalhandler(int sig) {
  94
  95   static int re_enter = 0;
  96
  97   switch (sig) {
  98   case SIGCHLD:
  99     int status;
 100     waitpid(-1, &status, WNOHANG | WUNTRACED);
 101     break;
 102
 103   default:
 104     if (base_display->handleSignal(sig))
 105       return;
 106
 107     fprintf(stderr, "%s:  signal %d caught\n",
 108             base_display->getApplicationName(), sig);
 109
 110     if (! base_display->isStartup() && ! re_enter) {
 111       internal_error = True;
 112
 113       re_enter = 1;
 114       fprintf(stderr, "shutting down\n");
 115       base_display->shutdown();
 116     }
 117
 118     if (sig != SIGTERM && sig != SIGINT) {
 119       fprintf(stderr, "aborting... dumping core\n");
 120       abort();
 121     }
 122
 123     exit(0);
 124
 125     break;
 126   }
 127 }
 128
 129
 130 BaseDisplay::BaseDisplay(const char *app_name, const char *dpy_name) {
 131   application_name = app_name;
 132
 133   run_state = STARTUP;
 134
 135   ::base_display = this;
 136
 137   struct sigaction action;
 138
 139   action.sa_handler = signalhandler;
 140   action.sa_mask = sigset_t();
 141   action.sa_flags = SA_NOCLDSTOP | SA_NODEFER;
 142
 143   sigaction(SIGPIPE, &action, NULL);
 144   sigaction(SIGSEGV, &action, NULL);
 145   sigaction(SIGFPE, &action, NULL);
 146   sigaction(SIGTERM, &action, NULL);
 147   sigaction(SIGINT, &action, NULL);
 148   sigaction(SIGCHLD, &action, NULL);
 149   sigaction(SIGHUP, &action, NULL);
 150   sigaction(SIGUSR1, &action, NULL);
 151   sigaction(SIGUSR2, &action, NULL);
 152
 153   if (! (display = XOpenDisplay(dpy_name))) {
 154     fprintf(stderr,
 155             "BaseDisplay::BaseDisplay: connection to X server failed.\n");
 156     ::exit(2);
 157   } else if (fcntl(ConnectionNumber(display), F_SETFD, 1) == -1) {
 158     fprintf(stderr,
 159             "BaseDisplay::BaseDisplay: couldn't mark display connection "
 160             "as close-on-exec\n");
 161     ::exit(2);
 162   }
 163
 164   display_name = XDisplayName(dpy_name);
 165
 166 #ifdef    SHAPE
 167   shape.extensions = XShapeQueryExtension(display, &shape.event_basep,
 168                                           &shape.error_basep);
 169 #else // !SHAPE
 170   shape.extensions = False;
 171 #endif // SHAPE
 172
 173 #ifdef    XINERAMA
 174   if (XineramaQueryExtension(display, &xinerama.event_basep,
 175                              &xinerama.error_basep) &&
 176       XineramaQueryVersion(display, &xinerama.major, &xinerama.minor)) {
 177 #ifdef    DEBUG
 178     fprintf(stderr,
 179             "BaseDisplay::BaseDisplay: Found Xinerama version %d.%d\n",
 180             xinerama.major, xinerama.minor);
 181 #endif // DEBUG
 182     xinerama.extensions = True;
 183   } else {
 184     xinerama.extensions = False;
 185   }
 186 #endif // XINERAMA
 187
 188   XSetErrorHandler((XErrorHandler) handleXErrors);
 189
 190   screenInfoList.reserve(ScreenCount(display));
 191   for (int i = 0; i < ScreenCount(display); ++i)
 192     screenInfoList.push_back(ScreenInfo(this, i));
 193
 194   NumLockMask = ScrollLockMask = 0;
 195
 196   const XModifierKeymap* const modmap = XGetModifierMapping(display);
 197   if (modmap && modmap->max_keypermod > 0) {
 198     const int mask_table[] = {
 199       ShiftMask, LockMask, ControlMask, Mod1Mask,
 200       Mod2Mask, Mod3Mask, Mod4Mask, Mod5Mask
 201     };
 202     const size_t size = (sizeof(mask_table) / sizeof(mask_table[0])) *
 203       modmap->max_keypermod;
 204     // get the values of the keyboard lock modifiers
 205     // Note: Caps lock is not retrieved the same way as Scroll and Num lock
 206     // since it doesn't need to be.
 207     const KeyCode num_lock = XKeysymToKeycode(display, XK_Num_Lock);
 208     const KeyCode scroll_lock = XKeysymToKeycode(display, XK_Scroll_Lock);
 209
 210     for (size_t cnt = 0; cnt < size; ++cnt) {
 211       if (! modmap->modifiermap[cnt]) continue;
 212
 213       if (num_lock == modmap->modifiermap[cnt])
 214         NumLockMask = mask_table[cnt / modmap->max_keypermod];
 215       if (scroll_lock == modmap->modifiermap[cnt])
 216         ScrollLockMask = mask_table[cnt / modmap->max_keypermod];
 217     }
 218   }
 219
 220   MaskList[0] = 0;
 221   MaskList[1] = LockMask;
 222   MaskList[2] = NumLockMask;
 223   MaskList[3] = LockMask | NumLockMask;
 224   MaskList[4] = ScrollLockMask;
 225   MaskList[5] = ScrollLockMask | LockMask;
 226   MaskList[6] = ScrollLockMask | NumLockMask;
 227   MaskList[7] = ScrollLockMask | LockMask | NumLockMask;
 228   MaskListLength = sizeof(MaskList) / sizeof(MaskList[0]);
 229
 230   if (modmap) XFreeModifiermap(const_cast<XModifierKeymap*>(modmap));
 231
 232   gccache = (BGCCache *) 0;
 233 }
 234
 235
 236 BaseDisplay::~BaseDisplay(void) {
 237   delete gccache;
 238
 239   XCloseDisplay(display);
 240 }
 241
 242
 243 void BaseDisplay::eventLoop(void) {
 244   run();
 245
 246   const int xfd = ConnectionNumber(display);
 247
 248   while (run_state == RUNNING && ! internal_error) {
 249     if (XPending(display)) {
 250       XEvent e;
 251       XNextEvent(display, &e);
 252       process_event(&e);
 253     } else {
 254       fd_set rfds;
 255       timeval now, tm, *timeout = (timeval *) 0;
 256
 257       FD_ZERO(&rfds);
 258       FD_SET(xfd, &rfds);
 259
 260       if (! timerList.empty()) {
 261         const BTimer* const timer = timerList.top();
 262
 263         gettimeofday(&now, 0);
 264         tm = timer->timeRemaining(now);
 265
 266         timeout = &tm;
 267       }
 268
 269       select(xfd + 1, &rfds, 0, 0, timeout);
 270
 271       // check for timer timeout
 272       gettimeofday(&now, 0);
 273
 274       // there is a small chance for deadlock here:
 275       // *IF* the timer list keeps getting refreshed *AND* the time between
 276       // timer->start() and timer->shouldFire() is within the timer's period
 277       // then the timer will keep firing.  This should be VERY near impossible.
 278       while (! timerList.empty()) {
 279         BTimer *timer = timerList.top();
 280         if (! timer->shouldFire(now))
 281           break;
 282
 283         timerList.pop();
 284
 285         timer->fireTimeout();
 286         timer->halt();
 287         if (timer->isRecurring())
 288           timer->start();
 289       }
 290     }
 291   }
 292 }
 293
 294
 295 void BaseDisplay::addTimer(BTimer *timer) {
 296   if (! timer) return;
 297
 298   timerList.push(timer);
 299 }
 300
 301
 302 void BaseDisplay::removeTimer(BTimer *timer) {
 303   timerList.release(timer);
 304 }
 305
 306
 307 /*
 308  * Grabs a button, but also grabs the button in every possible combination
 309  * with the keyboard lock keys, so that they do not cancel out the event.
 310
 311  * if allow_scroll_lock is true then only the top half of the lock mask
 312  * table is used and scroll lock is ignored.  This value defaults to false.
 313  */
 314 void BaseDisplay::grabButton(unsigned int button, unsigned int modifiers,
 315                              Window grab_window, bool owner_events,
 316                              unsigned int event_mask, int pointer_mode,
 317                              int keyboard_mode, Window confine_to,
 318                              Cursor cursor, bool allow_scroll_lock) const {
 319   unsigned int length = (allow_scroll_lock) ? MaskListLength / 2:
 320                                               MaskListLength;
 321   for (size_t cnt = 0; cnt < length; ++cnt)
 322     XGrabButton(display, button, modifiers | MaskList[cnt], grab_window,
 323                 owner_events, event_mask, pointer_mode, keyboard_mode,
 324                 confine_to, cursor);
 325 }
 326
 327
 328 /*
 329  * Releases the grab on a button, and ungrabs all possible combinations of the
 330  * keyboard lock keys.
 331  */
 332 void BaseDisplay::ungrabButton(unsigned int button, unsigned int modifiers,
 333                                Window grab_window) const {
 334   for (size_t cnt = 0; cnt < MaskListLength; ++cnt)
 335     XUngrabButton(display, button, modifiers | MaskList[cnt], grab_window);
 336 }
 337
 338
 339 const ScreenInfo* BaseDisplay::getScreenInfo(unsigned int s) const {
 340   if (s < screenInfoList.size())
 341     return &screenInfoList[s];
 342   return (const ScreenInfo*) 0;
 343 }
 344
 345
 346 BGCCache* BaseDisplay::gcCache(void) const {
 347   if (! gccache)
 348     gccache = new BGCCache(this, screenInfoList.size());
 349
 350   return gccache;
 351 }