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                 /* XGetWindowAttributes return 1 on success */
  77                 if(!XGetWindowAttributes(globalconf.display, wins[i], &wa)
  78                    || wa.override_redirect
  79                    || XGetTransientForHint(globalconf.display, wins[i], &d1))
  80                     continue;
  81                 if(wa.map_state == IsViewable || window_getstate(wins[i]) == IconicState)
  82                 {
  83                     if(screen == 0)
  84                         real_screen = get_screen_bycoord(wa.x, wa.y);
  85                     client_manage(wins[i], &wa, real_screen);
  86                 }
  87             }
  88             /* now the transients */
  89             for(i = 0; i < num; i++)
  90             {
  91                 if(!XGetWindowAttributes(globalconf.display, wins[i], &wa))
  92                     continue;
  93                 if(XGetTransientForHint(globalconf.display, wins[i], &d1)
  94                    && (wa.map_state == IsViewable || window_getstate(wins[i]) == IconicState))
  95                 {
  96                     if(screen == 0)
  97                         real_screen = get_screen_bycoord(wa.x, wa.y);
  98                     client_manage(wins[i], &wa, real_screen);
  99                 }
 100             }
 101         }
 102         if(wins)
 103             XFree(wins);
 104     }
 105 }
 106
 107 /** Setup everything before running
 108  * \param screen Screen number
 109  * \todo clean things...
 110  */
 111 static void
 112 setup(int screen)
 113 {
 114     XSetWindowAttributes wa;
 115     Statusbar *statusbar;
 116     int phys_screen = get_phys_screen(screen);
 117
 118     /* init cursors */
 119     globalconf.cursor[CurNormal] = XCreateFontCursor(globalconf.display, XC_left_ptr);
 120     globalconf.cursor[CurResize] = XCreateFontCursor(globalconf.display, XC_sizing);
 121     globalconf.cursor[CurMove] = XCreateFontCursor(globalconf.display, XC_fleur);
 122
 123     /* select for events */
 124     wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
 125         | EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
 126     wa.cursor = globalconf.cursor[CurNormal];
 127
 128     XChangeWindowAttributes(globalconf.display,
 129                             RootWindow(globalconf.display, phys_screen),
 130                             CWEventMask | CWCursor, &wa);
 131
 132     XSelectInput(globalconf.display,
 133                  RootWindow(globalconf.display, phys_screen),
 134                  wa.event_mask);
 135
 136     grabkeys(phys_screen);
 137
 138     for(statusbar = globalconf.screens[screen].statusbar; statusbar; statusbar = statusbar->next)
 139         statusbar_init(statusbar, screen);
 140 }
 141
 142 /** Startup Error handler to check if another window manager
 143  * is already running.
 144  * \param disp Display
 145  * \param ee Error event
 146  */
 147 static int __attribute__ ((noreturn))
 148 xerrorstart(Display * disp __attribute__ ((unused)),
 149             XErrorEvent * ee __attribute__ ((unused)))
 150 {
 151     eprint("another window manager is already running\n");
 152 }
 153
 154 /** Quit awesome
 155  * \param screen Screen ID
 156  * \param arg nothing
 157  * \ingroup ui_callback
 158  */
 159 void
 160 uicb_quit(int screen __attribute__ ((unused)), char *arg __attribute__ ((unused)))
 161 {
 162     running = False;
 163 }
 164
 165 static void
 166 exit_on_signal(int sig __attribute__ ((unused)))
 167 {
 168     running = False;
 169 }
 170
 171 /* There's no way to check accesses to destroyed windows, thus those cases are
 172  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
 173  * default error handler, which may call exit.
 174  */
 175 static int
 176 xerror(Display * edpy, XErrorEvent * ee)
 177 {
 178     if(ee->error_code == BadWindow
 179        || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
 180        || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
 181        || (ee->request_code == X_PolyFillRectangle
 182            && ee->error_code == BadDrawable)
 183        || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
 184        || (ee->request_code == X_ConfigureWindow
 185            && ee->error_code == BadMatch) || (ee->request_code == X_GrabKey
 186                                               && ee->error_code == BadAccess)
 187        || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
 188         return 0;
 189     warn("fatal error: request code=%d, error code=%d\n", ee->request_code, ee->error_code);
 190     return xerrorxlib(edpy, ee);        /* may call exit */
 191 }
 192
 193 /** Hello, this is main
 194  * \param argc who knows
 195  * \param argv who knows
 196  * \return EXIT_SUCCESS I hope
 197  */
 198 typedef void event_handler (XEvent *);
 199 int
 200 main(int argc, char *argv[])
 201 {
 202     char buf[1024];
 203     const char *confpath = NULL;
 204     int r, xfd, e_dummy, csfd;
 205     fd_set rd;
 206     XEvent ev;
 207     Display * dpy;
 208     int shape_event, randr_event_base;
 209     int screen;
 210     event_handler **handler;
 211     struct sockaddr_un *addr;
 212
 213     /* check args */
 214     if(argc >= 2)
 215     {
 216         if(!a_strcmp("-v", argv[1]) || !a_strcmp("--version", argv[1]))
 217         {
 218             printf("awesome " VERSION " (" RELEASE ")\n");
 219             return EXIT_SUCCESS;
 220         }
 221         else if(!a_strcmp("-c", argv[1]))
 222         {
 223             if(a_strlen(argv[2]))
 224                 confpath = argv[2];
 225             else
 226                 eprint("-c require a file\n");
 227         }
 228         else
 229             eprint("options: [-v | -c configfile]\n");
 230     }
 231
 232     /* X stuff */
 233     if(!(dpy = XOpenDisplay(NULL)))
 234         eprint("cannot open display\n");
 235
 236     xfd = ConnectionNumber(dpy);
 237
 238     XSetErrorHandler(xerrorstart);
 239     for(screen = 0; screen < ScreenCount(dpy); screen++)
 240         /* this causes an error if some other window manager is running */
 241         XSelectInput(dpy, RootWindow(dpy, screen), SubstructureRedirectMask);
 242
 243     /* need to XSync to validate errorhandler */
 244     XSync(dpy, False);
 245     XSetErrorHandler(NULL);
 246     xerrorxlib = XSetErrorHandler(xerror);
 247     XSync(dpy, False);
 248
 249     /* store display */
 250     globalconf.display = dpy;
 251
 252     /* init EWMH atoms */
 253     ewmh_init_atoms();
 254
 255     /* init screens struct */
 256     globalconf.screens = p_new(VirtScreen, get_screen_count());
 257     focus_add_client(NULL);
 258
 259     /* parse config */
 260     config_parse(confpath);
 261
 262     /* for each virtual screen */
 263     for(screen = 0; screen < get_screen_count(); screen++)
 264         setup(screen);
 265
 266     /* do this only for real screen */
 267     for(screen = 0; screen < ScreenCount(dpy); screen++)
 268     {
 269         loadawesomeprops(screen);
 270         ewmh_set_supported_hints(screen);
 271     }
 272
 273     handler = p_new(event_handler *, LASTEvent);
 274     handler[ButtonPress] = handle_event_buttonpress;
 275     handler[ConfigureRequest] = handle_event_configurerequest;
 276     handler[ConfigureNotify] = handle_event_configurenotify;
 277     handler[DestroyNotify] = handle_event_destroynotify;
 278     handler[EnterNotify] = handle_event_enternotify;
 279     handler[LeaveNotify] = handle_event_leavenotify;
 280     handler[Expose] = handle_event_expose;
 281     handler[KeyPress] = handle_event_keypress;
 282     handler[MappingNotify] = handle_event_mappingnotify;
 283     handler[MapRequest] = handle_event_maprequest;
 284     handler[PropertyNotify] = handle_event_propertynotify;
 285     handler[UnmapNotify] = handle_event_unmapnotify;
 286     handler[ClientMessage] = handle_event_clientmessage;
 287
 288     /* check for shape extension */
 289     if((globalconf.have_shape = XShapeQueryExtension(dpy, &shape_event, &e_dummy)))
 290     {
 291         p_realloc(&handler, shape_event + 1);
 292         handler[shape_event] = handle_event_shape;
 293     }
 294
 295     /* check for randr extension */
 296     if((globalconf.have_randr = XRRQueryExtension(dpy, &randr_event_base, &e_dummy)))
 297     {
 298         p_realloc(&handler, randr_event_base + RRScreenChangeNotify + 1);
 299         handler[randr_event_base + RRScreenChangeNotify] = handle_event_randr_screen_change_notify;
 300     }
 301
 302     scan();
 303
 304     XSync(dpy, False);
 305
 306     /* get socket fd */
 307     csfd = get_client_socket();
 308     addr = get_client_addr(getenv("DISPLAY"));
 309
 310     if(bind(csfd, (const struct sockaddr *) addr, SUN_LEN(addr)))
 311     {
 312         if(errno == EADDRINUSE)
 313         {
 314             if(unlink(addr->sun_path))
 315                 perror("error unlinking existing file");
 316             if(bind(csfd, (const struct sockaddr *) addr, SUN_LEN(addr)))
 317                 perror("error binding UNIX domain socket");
 318         }
 319         else
 320             perror("error binding UNIX domain socket");
 321     }
 322
 323     /* register function for signals */
 324     signal(SIGINT, &exit_on_signal);
 325     signal(SIGTERM, &exit_on_signal);
 326     signal(SIGHUP, &exit_on_signal);
 327
 328     /* main event loop, also reads status text from socket */
 329     while(running)
 330     {
 331         FD_ZERO(&rd);
 332         if(csfd >= 0)
 333             FD_SET(csfd, &rd);
 334         FD_SET(xfd, &rd);
 335         if(select(MAX(xfd, csfd) + 1, &rd, NULL, NULL, NULL) == -1)
 336         {
 337             if(errno == EINTR)
 338                 continue;
 339             eprint("select failed\n");
 340         }
 341         if(csfd >= 0 && FD_ISSET(csfd, &rd))
 342             switch (r = recv(csfd, buf, sizeof(buf)-1, MSG_TRUNC))
 343             {
 344               case -1:
 345                 perror("awesome: error reading UNIX domain socket");
 346                 csfd = -1;
 347                 break;
 348               case 0:
 349                 break;
 350               default:
 351                 if(r >= ssizeof(buf))
 352                     break;
 353                 buf[r] = '\0';
 354                 parse_control(buf);
 355             }
 356
 357         while(XPending(dpy))
 358         {
 359             XNextEvent(dpy, &ev);
 360             if(handler[ev.type])
 361                 handler[ev.type](&ev);       /* call handler */
 362         }
 363
 364         statusbar_refresh();
 365     }
 366
 367     if(csfd > 0 && close(csfd))
 368         perror("error closing UNIX domain socket");
 369     if(unlink(addr->sun_path))
 370         perror("error unlinking UNIX domain socket");
 371     p_delete(&addr);
 372
 373     XCloseDisplay(dpy);
 374
 375     return EXIT_SUCCESS;
 376 }
 377 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80