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 "common/awesome-version.h"
  42 #include "awesome.h"
  43 #include "event.h"
  44 #include "layout.h"
  45 #include "screen.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 #include "common/util.h"
  54
  55 static int (*xerrorxlib) (Display *, XErrorEvent *);
  56 static Bool running = True;
  57
  58 AwesomeConf globalconf;
  59
  60 /** Scan X to find windows to manage
  61  */
  62 static void
  63 scan()
  64 {
  65     unsigned int i, num;
  66     int screen, real_screen;
  67     Window *wins = NULL, d1, d2;
  68     XWindowAttributes wa;
  69
  70     for(screen = 0; screen < ScreenCount(globalconf.display); screen++)
  71     {
  72         if(XQueryTree(globalconf.display, RootWindow(globalconf.display, screen), &d1, &d2, &wins, &num))
  73         {
  74             real_screen = screen;
  75             for(i = 0; i < num; i++)
  76             {
  77                 /* XGetWindowAttributes return 1 on success */
  78                 if(!XGetWindowAttributes(globalconf.display, wins[i], &wa)
  79                    || wa.override_redirect
  80                    || XGetTransientForHint(globalconf.display, wins[i], &d1))
  81                     continue;
  82                 if(wa.map_state == IsViewable || window_getstate(wins[i]) == IconicState)
  83                 {
  84                     if(screen == 0)
  85                         real_screen = get_screen_bycoord(wa.x, wa.y);
  86                     client_manage(wins[i], &wa, real_screen);
  87                 }
  88             }
  89             /* now the transients */
  90             for(i = 0; i < num; i++)
  91             {
  92                 if(!XGetWindowAttributes(globalconf.display, wins[i], &wa))
  93                     continue;
  94                 if(XGetTransientForHint(globalconf.display, wins[i], &d1)
  95                    && (wa.map_state == IsViewable || window_getstate(wins[i]) == IconicState))
  96                 {
  97                     if(screen == 0)
  98                         real_screen = get_screen_bycoord(wa.x, wa.y);
  99                     client_manage(wins[i], &wa, real_screen);
 100                 }
 101             }
 102         }
 103         if(wins)
 104             XFree(wins);
 105     }
 106 }
 107
 108 /** Setup everything before running
 109  * \param screen Screen number
 110  * \todo clean things...
 111  */
 112 static void
 113 setup(int screen)
 114 {
 115     XSetWindowAttributes wa;
 116     Statusbar *statusbar;
 117     int phys_screen = get_phys_screen(screen);
 118
 119     /* init cursors */
 120     globalconf.cursor[CurNormal] = XCreateFontCursor(globalconf.display, XC_left_ptr);
 121     globalconf.cursor[CurResize] = XCreateFontCursor(globalconf.display, XC_sizing);
 122     globalconf.cursor[CurMove] = XCreateFontCursor(globalconf.display, XC_fleur);
 123
 124     /* select for events */
 125     wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
 126         | EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
 127     wa.cursor = globalconf.cursor[CurNormal];
 128
 129     XChangeWindowAttributes(globalconf.display,
 130                             RootWindow(globalconf.display, phys_screen),
 131                             CWEventMask | CWCursor, &wa);
 132
 133     XSelectInput(globalconf.display,
 134                  RootWindow(globalconf.display, phys_screen),
 135                  wa.event_mask);
 136
 137     grabkeys(phys_screen);
 138
 139     for(statusbar = globalconf.screens[screen].statusbar; statusbar; statusbar = statusbar->next)
 140         statusbar_init(statusbar);
 141 }
 142
 143 /** Startup Error handler to check if another window manager
 144  * is already running.
 145  * \param disp Display
 146  * \param ee Error event
 147  */
 148 static int __attribute__ ((noreturn))
 149 xerrorstart(Display * disp __attribute__ ((unused)),
 150             XErrorEvent * ee __attribute__ ((unused)))
 151 {
 152     eprint("another window manager is already running\n");
 153 }
 154
 155 /** Quit awesome
 156  * \param screen Screen ID
 157  * \param arg nothing
 158  * \ingroup ui_callback
 159  */
 160 void
 161 uicb_quit(int screen __attribute__ ((unused)), char *arg __attribute__ ((unused)))
 162 {
 163     running = False;
 164 }
 165
 166 static void
 167 exit_on_signal(int sig __attribute__ ((unused)))
 168 {
 169     running = False;
 170 }
 171
 172 /* There's no way to check accesses to destroyed windows, thus those cases are
 173  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
 174  * default error handler, which may call exit.
 175  */
 176 static int
 177 xerror(Display * edpy, XErrorEvent * ee)
 178 {
 179     if(ee->error_code == BadWindow)
 180         return 0;
 181     warn("fatal error: request code=%d, error code=%d\n", ee->request_code, ee->error_code);
 182     return xerrorxlib(edpy, ee);        /* may call exit */
 183 }
 184
 185 /** Print help and exit(2) with given exit_code.
 186  */
 187 static void __attribute__ ((noreturn))
 188 exit_help(int exit_code)
 189 {
 190     FILE *outfile = (exit_code == EXIT_SUCCESS) ? stdout : stderr;
 191     fprintf(outfile, "Usage: awesome [-v | -h | -c configfile]\n");
 192     exit(exit_code);
 193 }
 194
 195 /** Hello, this is main
 196  * \param argc who knows
 197  * \param argv who knows
 198  * \return EXIT_SUCCESS I hope
 199  */
 200 typedef void event_handler (XEvent *);
 201 int
 202 main(int argc, char *argv[])
 203 {
 204     char buf[1024];
 205     const char *confpath = NULL;
 206     int r, xfd, e_dummy, csfd;
 207     fd_set rd;
 208     XEvent ev;
 209     Display * dpy;
 210     int shape_event, randr_event_base;
 211     int screen;
 212     int i, cmdlen;
 213     event_handler **handler;
 214     struct sockaddr_un *addr;
 215     int args_ok = 1;
 216
 217     /* check args */
 218     if(argc >= 2)
 219     {
 220         args_ok = 0;
 221         if(!a_strcmp("-v", argv[1]) || !a_strcmp("--version", argv[1]))
 222             eprint_version("awesome");
 223         else if(!a_strcmp("-h", argv[1]) || !a_strcmp("--help", argv[1]))
 224             exit_help(EXIT_SUCCESS);
 225         else if(!a_strcmp("-c", argv[1]))
 226         {
 227             if(a_strlen(argv[2]))
 228                 confpath = argv[2], args_ok = 1;
 229             else
 230                 eprint("-c option requires a file name\n");
 231         }
 232         else
 233             exit_help(EXIT_FAILURE);
 234     }
 235     if(!args_ok)
 236         exit_help(EXIT_FAILURE);
 237
 238     /* Text won't be printed correctly otherwise */
 239     setlocale(LC_CTYPE, "");
 240
 241     /* X stuff */
 242     if(!(dpy = XOpenDisplay(NULL)))
 243         eprint("cannot open display\n");
 244
 245     for(cmdlen = 0, i = 0; i < argc; i++)
 246         cmdlen += a_strlen(argv[i] + 1);
 247     globalconf.argv = p_new(char, cmdlen);
 248     a_strcpy(globalconf.argv, cmdlen, argv[0]);
 249     for(i = 1; i < argc; i++)
 250     {
 251         a_strcat(globalconf.argv, cmdlen, " ");
 252         a_strcat(globalconf.argv, cmdlen, argv[i]);
 253     }
 254
 255     xfd = ConnectionNumber(dpy);
 256
 257     XSetErrorHandler(xerrorstart);
 258     for(screen = 0; screen < ScreenCount(dpy); screen++)
 259         /* this causes an error if some other window manager is running */
 260         XSelectInput(dpy, RootWindow(dpy, screen), SubstructureRedirectMask);
 261
 262     /* need to XSync to validate errorhandler */
 263     XSync(dpy, False);
 264     XSetErrorHandler(NULL);
 265     xerrorxlib = XSetErrorHandler(xerror);
 266     XSync(dpy, False);
 267
 268     /* store display */
 269     globalconf.display = dpy;
 270
 271     /* init EWMH atoms */
 272     ewmh_init_atoms();
 273
 274     /* init screens struct */
 275     screen_build_screens();
 276     focus_add_client(NULL);
 277
 278     /* parse config */
 279     config_parse(confpath);
 280
 281     scan();
 282
 283     /* for each virtual screen */
 284     for(screen = 0; screen < globalconf.nscreen; screen++)
 285         setup(screen);
 286
 287     /* do this only for real screen */
 288     for(screen = 0; screen < ScreenCount(dpy); screen++)
 289     {
 290         loadawesomeprops(screen);
 291         ewmh_set_supported_hints(screen);
 292         /* call this to at least grab root window clicks */
 293         window_root_grabbuttons(screen);
 294     }
 295
 296     handler = p_new(event_handler *, LASTEvent);
 297     handler[ButtonPress] = handle_event_buttonpress;
 298     handler[ConfigureRequest] = handle_event_configurerequest;
 299     handler[ConfigureNotify] = handle_event_configurenotify;
 300     handler[DestroyNotify] = handle_event_destroynotify;
 301     handler[EnterNotify] = handle_event_enternotify;
 302     handler[LeaveNotify] = handle_event_leavenotify;
 303     handler[Expose] = handle_event_expose;
 304     handler[KeyPress] = handle_event_keypress;
 305     handler[MappingNotify] = handle_event_mappingnotify;
 306     handler[MapRequest] = handle_event_maprequest;
 307     handler[PropertyNotify] = handle_event_propertynotify;
 308     handler[UnmapNotify] = handle_event_unmapnotify;
 309     handler[ClientMessage] = handle_event_clientmessage;
 310
 311     /* check for shape extension */
 312     if((globalconf.have_shape = XShapeQueryExtension(dpy, &shape_event, &e_dummy)))
 313     {
 314         p_realloc(&handler, shape_event + 1);
 315         handler[shape_event] = handle_event_shape;
 316     }
 317
 318     /* check for randr extension */
 319     if((globalconf.have_randr = XRRQueryExtension(dpy, &randr_event_base, &e_dummy)))
 320     {
 321         p_realloc(&handler, randr_event_base + RRScreenChangeNotify + 1);
 322         handler[randr_event_base + RRScreenChangeNotify] = handle_event_randr_screen_change_notify;
 323     }
 324
 325     XSync(dpy, False);
 326
 327     /* get socket fd */
 328     csfd = get_client_socket();
 329     addr = get_client_addr(getenv("DISPLAY"));
 330
 331     if(bind(csfd, (const struct sockaddr *) addr, SUN_LEN(addr)))
 332     {
 333         if(errno == EADDRINUSE)
 334         {
 335             if(unlink(addr->sun_path))
 336                 perror("error unlinking existing file");
 337             if(bind(csfd, (const struct sockaddr *) addr, SUN_LEN(addr)))
 338                 perror("error binding UNIX domain socket");
 339         }
 340         else
 341             perror("error binding UNIX domain socket");
 342     }
 343
 344     /* register function for signals */
 345     signal(SIGINT, &exit_on_signal);
 346     signal(SIGTERM, &exit_on_signal);
 347     signal(SIGHUP, &exit_on_signal);
 348
 349     /* refresh everything before waiting events */
 350     statusbar_refresh();
 351     layout_refresh();
 352
 353     /* main event loop, also reads status text from socket */
 354     while(running)
 355     {
 356         FD_ZERO(&rd);
 357         if(csfd >= 0)
 358             FD_SET(csfd, &rd);
 359         FD_SET(xfd, &rd);
 360         if(select(MAX(xfd, csfd) + 1, &rd, NULL, NULL, NULL) == -1)
 361         {
 362             if(errno == EINTR)
 363                 continue;
 364             eprint("select failed\n");
 365         }
 366         if(csfd >= 0 && FD_ISSET(csfd, &rd))
 367             switch (r = recv(csfd, buf, sizeof(buf)-1, MSG_TRUNC))
 368             {
 369               case -1:
 370                 perror("awesome: error reading UNIX domain socket");
 371                 csfd = -1;
 372                 break;
 373               case 0:
 374                 break;
 375               default:
 376                 if(r >= ssizeof(buf))
 377                     break;
 378                 buf[r] = '\0';
 379                 parse_control(buf);
 380                 statusbar_refresh();
 381                 layout_refresh();
 382             }
 383         /* two level XPending:
 384          * we need to first check we have XEvent to handle
 385          * and if so, we handle them all in a round.
 386          * Then when we have refresh()'ed stuff so maybe new XEvent
 387          * are available and select() won't tell us, so let's check
 388          * with XPending() again.
 389          */
 390         while(XPending(dpy))
 391         {
 392             while(XPending(dpy))
 393             {
 394                 XNextEvent(dpy, &ev);
 395                 if(handler[ev.type])
 396                     handler[ev.type](&ev);       /* call handler */
 397
 398                 /* drop events requested to */
 399                 if(globalconf.drop_events)
 400                 {
 401                     /* need to resync */
 402                     XSync(dpy, False);
 403                     while(XCheckMaskEvent(dpy, globalconf.drop_events, &ev));
 404                     globalconf.drop_events = NoEventMask;
 405                 }
 406
 407                 /* need to resync */
 408                 XSync(dpy, False);
 409             }
 410
 411             statusbar_refresh();
 412             layout_refresh();
 413
 414             /* need to resync */
 415             XSync(dpy, False);
 416         }
 417     }
 418
 419     if(csfd > 0 && close(csfd))
 420         perror("error closing UNIX domain socket");
 421     if(unlink(addr->sun_path))
 422         perror("error unlinking UNIX domain socket");
 423     p_delete(&addr);
 424
 425     XCloseDisplay(dpy);
 426
 427     return EXIT_SUCCESS;
 428 }
 429 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80