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 #define _GNU_SOURCE
  23 #include <getopt.h>
  24
  25 #include <errno.h>
  26 #include <locale.h>
  27 #include <stdio.h>
  28 #include <unistd.h>
  29 #include <sys/select.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <sys/socket.h>
  33 #include <sys/un.h>
  34 #include <fcntl.h>
  35 #include <signal.h>
  36 #include <X11/cursorfont.h>
  37 #include <X11/keysym.h>
  38 #include <X11/Xatom.h>
  39 #include <X11/Xproto.h>
  40 #include <X11/Xutil.h>
  41 #include <X11/extensions/shape.h>
  42 #include <X11/extensions/Xrandr.h>
  43
  44 #include "config.h"
  45 #include "awesome.h"
  46 #include "event.h"
  47 #include "layout.h"
  48 #include "screen.h"
  49 #include "statusbar.h"
  50 #include "uicb.h"
  51 #include "window.h"
  52 #include "client.h"
  53 #include "focus.h"
  54 #include "ewmh.h"
  55 #include "tag.h"
  56 #include "common/socket.h"
  57 #include "common/util.h"
  58 #include "common/version.h"
  59 #include "common/configopts.h"
  60 #include "common/xscreen.h"
  61
  62 static int (*xerrorxlib) (Display *, XErrorEvent *);
  63 static Bool running = True;
  64
  65 AwesomeConf globalconf;
  66
  67 /** Scan X to find windows to manage
  68  */
  69 static void
  70 scan()
  71 {
  72     unsigned int i, num;
  73     int screen, real_screen;
  74     Window *wins = NULL, d1, d2;
  75     XWindowAttributes wa;
  76
  77     for(screen = 0; screen < ScreenCount(globalconf.display); screen++)
  78     {
  79         if(XQueryTree(globalconf.display, RootWindow(globalconf.display, screen), &d1, &d2, &wins, &num))
  80             for(i = 0; i < num; i++)
  81                 /* XGetWindowAttributes return 1 on success */
  82                 if(XGetWindowAttributes(globalconf.display, wins[i], &wa)
  83                    && !wa.override_redirect
  84                    && (wa.map_state == IsViewable || window_getstate(wins[i]) == IconicState))
  85                 {
  86                     real_screen = screen_get_bycoord(globalconf.screens_info, screen, wa.x, wa.y);
  87                     client_manage(wins[i], &wa, real_screen);
  88                 }
  89         if(wins)
  90             XFree(wins);
  91     }
  92 }
  93
  94 /** Startup Error handler to check if another window manager
  95  * is already running.
  96  * \param disp Display
  97  * \param ee Error event
  98  */
  99 static int __attribute__ ((noreturn))
 100 xerrorstart(Display * disp __attribute__ ((unused)),
 101             XErrorEvent * ee __attribute__ ((unused)))
 102 {
 103     eprint("another window manager is already running\n");
 104 }
 105
 106 /** Quit awesome
 107  * \param screen Screen ID
 108  * \param arg nothing
 109  * \ingroup ui_callback
 110  */
 111 void
 112 uicb_quit(int screen __attribute__ ((unused)), char *arg __attribute__ ((unused)))
 113 {
 114     running = False;
 115 }
 116
 117 static void
 118 exit_on_signal(int sig __attribute__ ((unused)))
 119 {
 120     running = False;
 121 }
 122
 123 /** \brief awesome xerror function
 124  * There's no way to check accesses to destroyed windows, thus those cases are
 125  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
 126  * default error handler, which may call exit.
 127  * \param edpy display ref
 128  * \param ee XErrorEvent event
 129  * \return 0 if no error, or xerror's xlib return status
 130  */
 131 static int
 132 xerror(Display *edpy, XErrorEvent *ee)
 133 {
 134     if(ee->error_code == BadWindow
 135        || (ee->error_code == BadMatch && ee->request_code == X_SetInputFocus)
 136        || (ee->error_code == BadValue && ee->request_code == X_KillClient)
 137        || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch))
 138         return 0;
 139     warn("fatal error: request code=%d, error code=%d\n", ee->request_code, ee->error_code);
 140     return xerrorxlib(edpy, ee);        /* may call exit */
 141 }
 142
 143 /** Print help and exit(2) with given exit_code.
 144  */
 145 static void __attribute__ ((noreturn))
 146 exit_help(int exit_code)
 147 {
 148     FILE *outfile = (exit_code == EXIT_SUCCESS) ? stdout : stderr;
 149     fprintf(outfile,
 150 "Usage: awesome [OPTION]\n\
 151   -h, --help             show help\n\
 152   -v, --version          show version\n\
 153   -c, --config FILE      configuration file to use\n\
 154   -k, --check            check configuration file syntax\n\
 155   -s  --sync             enable synchronization (X debug)\n");
 156     exit(exit_code);
 157 }
 158
 159 /** Hello, this is main
 160  * \param argc who knows
 161  * \param argv who knows
 162  * \return EXIT_SUCCESS I hope
 163  */
 164 typedef void event_handler (XEvent *);
 165 int
 166 main(int argc, char *argv[])
 167 {
 168     char buf[1024];
 169     const char *confpath = NULL;
 170     int r, xfd, e_dummy, csfd, shape_event, randr_event_base, i, screen, opt;
 171     ssize_t cmdlen = 1;
 172     Statusbar *statusbar;
 173     fd_set rd;
 174     XEvent ev;
 175     Display * dpy;
 176     event_handler **handler;
 177     struct sockaddr_un *addr;
 178     Client *c;
 179     XSetWindowAttributes wa;
 180     Bool xsync = False, confcheck = False;
 181     static struct option long_options[] =
 182     {
 183         {"help",    0, NULL, 'h'},
 184         {"version", 0, NULL, 'v'},
 185         {"check",   0, NULL, 'k'},
 186         {"config",  1, NULL, 'c'},
 187         {"sync",    0, NULL, 's'},
 188         {NULL,      0, NULL, 0}
 189     };
 190
 191     /* save argv */
 192     for(i = 0; i < argc; i++)
 193         cmdlen += a_strlen(argv[i]) + 1;
 194
 195     globalconf.argv = p_new(char, cmdlen);
 196     a_strcpy(globalconf.argv, cmdlen, argv[0]);
 197
 198     for(i = 1; i < argc; i++)
 199     {
 200         a_strcat(globalconf.argv, cmdlen, " ");
 201         a_strcat(globalconf.argv, cmdlen, argv[i]);
 202     }
 203
 204     /* check args */
 205     while((opt = getopt_long(argc, argv, "vhkc:s",
 206                              long_options, NULL)) != -1)
 207         switch(opt)
 208         {
 209           case 'v':
 210             eprint_version("awesome");
 211             break;
 212           case 'h':
 213             exit_help(EXIT_SUCCESS);
 214             break;
 215           case 'c':
 216             if(a_strlen(optarg))
 217                 confpath = a_strdup(optarg);
 218             else
 219                 eprint("-c option requires a file name\n");
 220             break;
 221           case 'k':
 222             confcheck = True;
 223             break;
 224           case 's':
 225             xsync = True;
 226             break;
 227         }
 228
 229     /* Text won't be printed correctly otherwise */
 230     setlocale(LC_CTYPE, "");
 231
 232     if(confcheck)
 233         return config_check(confpath);
 234
 235     /* X stuff */
 236     if(!(dpy = XOpenDisplay(NULL)))
 237         eprint("cannot open display\n");
 238
 239     xfd = ConnectionNumber(dpy);
 240
 241     XSetErrorHandler(xerrorstart);
 242     for(screen = 0; screen < ScreenCount(dpy); screen++)
 243         /* this causes an error if some other window manager is running */
 244         XSelectInput(dpy, RootWindow(dpy, screen), SubstructureRedirectMask);
 245
 246     /* need to XSync to validate errorhandler */
 247     XSync(dpy, False);
 248     XSetErrorHandler(NULL);
 249     xerrorxlib = XSetErrorHandler(xerror);
 250     XSync(dpy, False);
 251
 252     if(xsync)
 253         XSynchronize(dpy, True);
 254
 255     /* store display */
 256     globalconf.display = dpy;
 257
 258     /* init EWMH atoms */
 259     ewmh_init_atoms();
 260
 261     /* init screens struct */
 262     globalconf.screens_info = screensinfo_new(dpy);
 263     globalconf.screens = p_new(VirtScreen, globalconf.screens_info->nscreen);
 264     focus_add_client(NULL);
 265
 266     /* parse config */
 267     config_parse(confpath);
 268
 269     /* init cursors */
 270     globalconf.cursor[CurNormal] = XCreateFontCursor(globalconf.display, XC_left_ptr);
 271     globalconf.cursor[CurResize] = XCreateFontCursor(globalconf.display, XC_sizing);
 272     globalconf.cursor[CurMove] = XCreateFontCursor(globalconf.display, XC_fleur);
 273
 274     /* for each virtual screen */
 275     for(screen = 0; screen < globalconf.screens_info->nscreen; screen++)
 276     {
 277         /* view at least one tag */
 278         tag_view(globalconf.screens[screen].tags, True);
 279
 280         for(statusbar = globalconf.screens[screen].statusbar; statusbar; statusbar = statusbar->next)
 281             statusbar_init(statusbar);
 282     }
 283
 284     /* select for events */
 285     wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
 286         | EnterWindowMask | LeaveWindowMask | StructureNotifyMask | PointerMotionMask;
 287     wa.cursor = globalconf.cursor[CurNormal];
 288
 289     /* do this only for real screen */
 290     for(screen = 0; screen < ScreenCount(dpy); screen++)
 291     {
 292         XChangeWindowAttributes(globalconf.display,
 293                                 RootWindow(globalconf.display, screen),
 294                                 CWEventMask | CWCursor, &wa);
 295         XSelectInput(globalconf.display,
 296                      RootWindow(globalconf.display, screen),
 297                      wa.event_mask);
 298         ewmh_set_supported_hints(screen);
 299         /* call this to at least grab root window clicks */
 300         window_root_grabbuttons(screen);
 301         window_root_grabkeys(screen);
 302     }
 303
 304     /* scan existing windows */
 305     scan();
 306
 307     handler = p_new(event_handler *, LASTEvent);
 308     handler[ButtonPress] = event_handle_buttonpress;
 309     handler[ConfigureRequest] = event_handle_configurerequest;
 310     handler[ConfigureNotify] = event_handle_configurenotify;
 311     handler[DestroyNotify] = event_handle_destroynotify;
 312     handler[EnterNotify] = event_handle_enternotify;
 313     handler[LeaveNotify] = event_handle_leavenotify;
 314     handler[MotionNotify] = event_handle_motionnotify;
 315     handler[Expose] = event_handle_expose;
 316     handler[KeyPress] = event_handle_keypress;
 317     handler[MappingNotify] = event_handle_mappingnotify;
 318     handler[MapRequest] = event_handle_maprequest;
 319     handler[PropertyNotify] = event_handle_propertynotify;
 320     handler[UnmapNotify] = event_handle_unmapnotify;
 321     handler[ClientMessage] = event_handle_clientmessage;
 322
 323     /* check for shape extension */
 324     if((globalconf.have_shape = XShapeQueryExtension(dpy, &shape_event, &e_dummy)))
 325     {
 326         p_realloc(&handler, shape_event + 1);
 327         handler[shape_event] = event_handle_shape;
 328     }
 329
 330     /* check for randr extension */
 331     if((globalconf.have_randr = XRRQueryExtension(dpy, &randr_event_base, &e_dummy)))
 332     {
 333         p_realloc(&handler, randr_event_base + RRScreenChangeNotify + 1);
 334         handler[randr_event_base + RRScreenChangeNotify] = event_handle_randr_screen_change_notify;
 335     }
 336
 337     XSync(dpy, False);
 338
 339     /* get socket fd */
 340     csfd = socket_getclient();
 341     addr = socket_getaddr(getenv("DISPLAY"));
 342
 343     if(bind(csfd, (const struct sockaddr *) addr, SUN_LEN(addr)))
 344     {
 345         if(errno == EADDRINUSE)
 346         {
 347             if(unlink(addr->sun_path))
 348                 warn("error unlinking existing file: %s\n", strerror(errno));
 349             if(bind(csfd, (const struct sockaddr *) addr, SUN_LEN(addr)))
 350                 warn("error binding UNIX domain socket: %s\n", strerror(errno));
 351         }
 352         else
 353             warn("error binding UNIX domain socket: %s\n", strerror(errno));
 354     }
 355
 356     /* register function for signals */
 357     signal(SIGINT, &exit_on_signal);
 358     signal(SIGTERM, &exit_on_signal);
 359     signal(SIGHUP, &exit_on_signal);
 360
 361     /* refresh everything before waiting events */
 362     statusbar_refresh();
 363     layout_refresh();
 364
 365     /* main event loop, also reads status text from socket */
 366     while(running)
 367     {
 368         FD_ZERO(&rd);
 369         if(csfd >= 0)
 370             FD_SET(csfd, &rd);
 371         FD_SET(xfd, &rd);
 372         if(select(MAX(xfd, csfd) + 1, &rd, NULL, NULL, NULL) == -1)
 373         {
 374             if(errno == EINTR)
 375                 continue;
 376             eprint("select failed\n");
 377         }
 378         if(csfd >= 0 && FD_ISSET(csfd, &rd))
 379             switch (r = recv(csfd, buf, sizeof(buf)-1, MSG_TRUNC))
 380             {
 381               case -1:
 382                 warn("error reading UNIX domain socket: %s\n", strerror(errno));
 383                 csfd = -1;
 384                 break;
 385               case 0:
 386                 break;
 387               default:
 388                 if(r >= ssizeof(buf))
 389                     break;
 390                 buf[r] = '\0';
 391                 parse_control(buf);
 392                 statusbar_refresh();
 393                 layout_refresh();
 394             }
 395         /* two level XPending:
 396          * we need to first check we have XEvent to handle
 397          * and if so, we handle them all in a round.
 398          * Then when we have refresh()'ed stuff so maybe new XEvent
 399          * are available and select() won't tell us, so let's check
 400          * with XPending() again.
 401          */
 402         while(XPending(dpy))
 403         {
 404             while(XPending(dpy))
 405             {
 406                 XNextEvent(dpy, &ev);
 407                 if(handler[ev.type])
 408                     handler[ev.type](&ev);
 409
 410                 /* need to resync */
 411                 XSync(dpy, False);
 412             }
 413
 414             statusbar_refresh();
 415             layout_refresh();
 416
 417             /* need to resync */
 418             XSync(dpy, False);
 419         }
 420     }
 421
 422
 423     if(csfd > 0 && close(csfd))
 424         warn("error closing UNIX domain socket: %s\n", strerror(errno));
 425     if(unlink(addr->sun_path))
 426         warn("error unlinking UNIX domain socket: %s\n", strerror(errno));
 427     p_delete(&addr);
 428
 429     /* remap all clients since some WM won't handle them otherwise */
 430     for(c = globalconf.clients; c; c = c->next)
 431         client_unban(c);
 432
 433     XSync(globalconf.display, False);
 434
 435     XCloseDisplay(dpy);
 436
 437     return EXIT_SUCCESS;
 438 }
 439 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80