awesome.c

   1 /*
   2  * awesome.c - awesome main functions
   3  *
   4  * Copyright © 2007-2008 Julien Danjou <julien@danjou.info>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  */
  21
  22 #include <errno.h>
  23 #include <locale.h>
  24 #include <stdio.h>
  25 #include <unistd.h>
  26 #include <sys/select.h>
  27 #include <sys/types.h>
  28 #include <sys/stat.h>
  29 #include <sys/socket.h>
  30 #include <sys/un.h>
  31 #include <fcntl.h>
  32 #include <signal.h>
  33 #include <X11/cursorfont.h>
  34 #include <X11/keysym.h>
  35 #include <X11/Xatom.h>
  36 #include <X11/Xproto.h>
  37 #include <X11/Xutil.h>
  38 #include <X11/extensions/shape.h>
  39 #include <X11/extensions/Xrandr.h>
  40
  41 #include "awesome.h"
  42 #include "event.h"
  43 #include "layout.h"
  44 #include "screen.h"
  45 #include "util.h"
  46 #include "statusbar.h"
  47 #include "uicb.h"
  48 #include "window.h"
  49 #include "client.h"
  50 #include "focus.h"
  51 #include "ewmh.h"
  52 #include "awesome-client.h"
  53
  54 static int (*xerrorxlib) (Display *, XErrorEvent *);
  55 static Bool running = True;
  56
  57 AwesomeConf globalconf;
  58
  59 /** Scan X to find windows to manage
  60  */
  61 static void
  62 scan()
  63 {
  64     unsigned int i, num;
  65     int screen, real_screen;
  66     Window *wins = NULL, d1, d2;
  67     XWindowAttributes wa;
  68
  69     for(screen = 0; screen < ScreenCount(globalconf.display); screen++)
  70     {
  71         if(XQueryTree(globalconf.display, RootWindow(globalconf.display, screen), &d1, &d2, &wins, &num))
  72         {
  73             real_screen = screen;
  74             for(i = 0; i < num; i++)
  75             {
  76                 if(!XGetWindowAttributes(globalconf.display, wins[i], &wa)
  77                    || wa.override_redirect
  78                    || XGetTransientForHint(globalconf.display, wins[i], &d1))
  79                     continue;
  80                 if(wa.map_state == IsViewable || window_getstate(wins[i]) == IconicState)
  81                 {
  82                     if(screen == 0)
  83                         real_screen = get_screen_bycoord(wa.x, wa.y);
  84                     client_manage(wins[i], &wa, real_screen);
  85                 }
  86             }
  87             /* now the transients */
  88             for(i = 0; i < num; i++)
  89             {
  90                 if(!XGetWindowAttributes(globalconf.display, wins[i], &wa))
  91                     continue;
  92                 if(XGetTransientForHint(globalconf.display, wins[i], &d1)
  93                    && (wa.map_state == IsViewable || window_getstate(wins[i]) == IconicState))
  94                 {
  95                     if(screen == 0)
  96                         real_screen = get_screen_bycoord(wa.x, wa.y);
  97                     client_manage(wins[i], &wa, real_screen);
  98                 }
  99             }
 100         }
 101         if(wins)
 102             XFree(wins);
 103     }
 104 }
 105
 106 /** Setup everything before running
 107  * \param screen Screen number
 108  * \todo clean things...
 109  */
 110 static void
 111 setup(int screen)
 112 {
 113     XSetWindowAttributes wa;
 114     Statusbar *statusbar;
 115     int phys_screen = get_phys_screen(screen);
 116
 117     /* init cursors */
 118     globalconf.cursor[CurNormal] = XCreateFontCursor(globalconf.display, XC_left_ptr);
 119     globalconf.cursor[CurResize] = XCreateFontCursor(globalconf.display, XC_sizing);
 120     globalconf.cursor[CurMove] = XCreateFontCursor(globalconf.display, XC_fleur);
 121
 122     /* select for events */
 123     wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
 124         | EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
 125     wa.cursor = globalconf.cursor[CurNormal];
 126
 127     XChangeWindowAttributes(globalconf.display,
 128                             RootWindow(globalconf.display, phys_screen),
 129                             CWEventMask | CWCursor, &wa);
 130
 131     XSelectInput(globalconf.display,
 132                  RootWindow(globalconf.display, phys_screen),
 133                  wa.event_mask);
 134
 135     grabkeys(phys_screen);
 136
 137     for(statusbar = globalconf.screens[screen].statusbar; statusbar; statusbar = statusbar->next)
 138         statusbar_init(statusbar, screen);
 139 }
 140
 141 /** Startup Error handler to check if another window manager
 142  * is already running.
 143  * \param disp Display
 144  * \param ee Error event
 145  */
 146 static int __attribute__ ((noreturn))
 147 xerrorstart(Display * disp __attribute__ ((unused)),
 148             XErrorEvent * ee __attribute__ ((unused)))
 149 {
 150     eprint("another window manager is already running\n");
 151 }
 152
 153 /** Quit awesome
 154  * \param screen Screen ID
 155  * \param arg nothing
 156  * \ingroup ui_callback
 157  */
 158 void
 159 uicb_quit(int screen __attribute__ ((unused)), char *arg __attribute__ ((unused)))
 160 {
 161     running = False;
 162 }
 163
 164 static void
 165 exit_on_signal(int sig __attribute__ ((unused)))
 166 {
 167     running = False;
 168 }
 169
 170 /* There's no way to check accesses to destroyed windows, thus those cases are
 171  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
 172  * default error handler, which may call exit.
 173  */
 174 static int
 175 xerror(Display * edpy, XErrorEvent * ee)
 176 {
 177     if(ee->error_code == BadWindow
 178        || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
 179        || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
 180        || (ee->request_code == X_PolyFillRectangle
 181            && ee->error_code == BadDrawable)
 182        || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
 183        || (ee->request_code == X_ConfigureWindow
 184            && ee->error_code == BadMatch) || (ee->request_code == X_GrabKey
 185                                               && ee->error_code == BadAccess)
 186        || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
 187         return 0;
 188     warn("fatal error: request code=%d, error code=%d\n", ee->request_code, ee->error_code);
 189     return xerrorxlib(edpy, ee);        /* may call exit */
 190 }
 191
 192 /** Hello, this is main
 193  * \param argc who knows
 194  * \param argv who knows
 195  * \return EXIT_SUCCESS I hope
 196  */
 197 typedef void event_handler (XEvent *);
 198 int
 199 main(int argc, char *argv[])
 200 {
 201     char buf[1024];
 202     const char *confpath = NULL;
 203     int r, xfd, e_dummy, csfd;
 204     fd_set rd;
 205     XEvent ev;
 206     Display * dpy;
 207     int shape_event, randr_event_base;
 208     int screen;
 209     event_handler **handler;
 210     struct sockaddr_un *addr;
 211
 212     /* check args */
 213     if(argc >= 2)
 214     {
 215         if(!a_strcmp("-v", argv[1]) || !a_strcmp("--version", argv[1]))
 216         {
 217             printf("awesome " VERSION " (" RELEASE ")\n");
 218             return EXIT_SUCCESS;
 219         }
 220         else if(!a_strcmp("-c", argv[1]))
 221         {
 222             if(a_strlen(argv[2]))
 223                 confpath = argv[2];
 224             else
 225                 eprint("-c require a file\n");
 226         }
 227         else
 228             eprint("options: [-v | -c configfile]\n");
 229     }
 230
 231     /* X stuff */
 232     if(!(dpy = XOpenDisplay(NULL)))
 233         eprint("cannot open display\n");
 234
 235     xfd = ConnectionNumber(dpy);
 236
 237     XSetErrorHandler(xerrorstart);
 238     for(screen = 0; screen < ScreenCount(dpy); screen++)
 239         /* this causes an error if some other window manager is running */
 240         XSelectInput(dpy, RootWindow(dpy, screen), SubstructureRedirectMask);
 241
 242     /* need to XSync to validate errorhandler */
 243     XSync(dpy, False);
 244     XSetErrorHandler(NULL);
 245     xerrorxlib = XSetErrorHandler(xerror);
 246     XSync(dpy, False);
 247
 248     /* store display */
 249     globalconf.display = dpy;
 250
 251     /* init EWMH atoms */
 252     ewmh_init_atoms();
 253
 254     /* init screens struct */
 255     globalconf.screens = p_new(VirtScreen, get_screen_count());
 256     focus_add_client(NULL);
 257
 258     /* parse config */
 259     config_parse(confpath);
 260
 261     /* for each virtual screen */
 262     for(screen = 0; screen < get_screen_count(); screen++)
 263         setup(screen);
 264
 265     /* do this only for real screen */
 266     for(screen = 0; screen < ScreenCount(dpy); screen++)
 267     {
 268         loadawesomeprops(screen);
 269         ewmh_set_supported_hints(screen);
 270     }
 271
 272     handler = p_new(event_handler *, LASTEvent);
 273     handler[ButtonPress] = handle_event_buttonpress;
 274     handler[ConfigureRequest] = handle_event_configurerequest;
 275     handler[ConfigureNotify] = handle_event_configurenotify;
 276     handler[DestroyNotify] = handle_event_destroynotify;
 277     handler[EnterNotify] = handle_event_enternotify;
 278     handler[LeaveNotify] = handle_event_leavenotify;
 279     handler[Expose] = handle_event_expose;
 280     handler[KeyPress] = handle_event_keypress;
 281     handler[MappingNotify] = handle_event_mappingnotify;
 282     handler[MapRequest] = handle_event_maprequest;
 283     handler[PropertyNotify] = handle_event_propertynotify;
 284     handler[UnmapNotify] = handle_event_unmapnotify;
 285     handler[ClientMessage] = handle_event_clientmessage;
 286
 287     /* check for shape extension */
 288     if((globalconf.have_shape = XShapeQueryExtension(dpy, &shape_event, &e_dummy)))
 289     {
 290         p_realloc(&handler, shape_event + 1);
 291         handler[shape_event] = handle_event_shape;
 292     }
 293
 294     /* check for randr extension */
 295     if((globalconf.have_randr = XRRQueryExtension(dpy, &randr_event_base, &e_dummy)))
 296     {
 297         p_realloc(&handler, randr_event_base + RRScreenChangeNotify + 1);
 298         handler[randr_event_base + RRScreenChangeNotify] = handle_event_randr_screen_change_notify;
 299     }
 300
 301     scan();
 302
 303     XSync(dpy, False);
 304
 305     /* get socket fd */
 306     csfd = get_client_socket();
 307     addr = get_client_addr(getenv("DISPLAY"));
 308
 309     if(bind(csfd, (const struct sockaddr *) addr, SUN_LEN(addr)))
 310     {
 311         if(errno == EADDRINUSE)
 312         {
 313             if(unlink(addr->sun_path))
 314                 perror("error unlinking existing file");
 315             if(bind(csfd, (const struct sockaddr *) addr, SUN_LEN(addr)))
 316                 perror("error binding UNIX domain socket");
 317         }
 318         else
 319             perror("error binding UNIX domain socket");
 320     }
 321
 322     /* register function for signals */
 323     signal(SIGINT, &exit_on_signal);
 324     signal(SIGTERM, &exit_on_signal);
 325     signal(SIGHUP, &exit_on_signal);
 326
 327     /* main event loop, also reads status text from socket */
 328     while(running)
 329     {
 330         FD_ZERO(&rd);
 331         if(csfd >= 0)
 332             FD_SET(csfd, &rd);
 333         FD_SET(xfd, &rd);
 334         if(select(MAX(xfd, csfd) + 1, &rd, NULL, NULL, NULL) == -1)
 335         {
 336             if(errno == EINTR)
 337                 continue;
 338             eprint("select failed\n");
 339         }
 340         if(csfd >= 0 && FD_ISSET(csfd, &rd))
 341             switch (r = recv(csfd, buf, sizeof(buf)-1, MSG_TRUNC))
 342             {
 343             case -1:
 344                 perror("awesome: error reading UNIX domain socket");
 345                 csfd = -1;
 346                 break;
 347             case 0:
 348                 break;
 349             default:
 350                 if(r >= ssizeof(buf))
 351                     break;
 352                 buf[r] = '\0';
 353                 parse_control(buf);
 354             }
 355
 356         while(XPending(dpy))
 357         {
 358             XNextEvent(dpy, &ev);
 359             if(handler[ev.type])
 360                 handler[ev.type](&ev);       /* call handler */
 361         }
 362     }
 363
 364     if(csfd > 0 && close(csfd))
 365         perror("error closing UNIX domain socket");
 366     if(unlink(addr->sun_path))
 367         perror("error unlinking UNIX domain socket");
 368     p_delete(&addr);
 369
 370     XCloseDisplay(dpy);
 371
 372     return EXIT_SUCCESS;
 373 }
 374 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80