summaryrefslogtreecommitdiff
path: root/src/core/main.c
blob: d6d789e236cf0324225d23c254f7762381d68072 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */

/* Marco main() */

/*
 * Copyright (C) 2001 Havoc Pennington
 * Copyright (C) 2006 Elijah Newren
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

/**
 * \file
 * Program startup.
 * Functions which parse the command-line arguments, create the display,
 * kick everything off and then close down Marco when it's time to go.
 */

/**
 * \mainpage
 * Marco - a boring window manager for the adult in you
 *
 * Many window managers are like Marshmallow Froot Loops; Marco
 * is like Cheerios.
 *
 * The best way to get a handle on how the whole system fits together
 * is discussed in doc/code-overview.txt; if you're looking for functions
 * to investigate, read main(), meta_display_open(), and event_callback().
 */

#define _GNU_SOURCE
#define _SVID_SOURCE /* for putenv() and some signal-related functions */

#include <config.h>
#include "main.h"
#include "util.h"
#include "display-private.h"
#include "errors.h"
#include "ui.h"
#include "session.h"
#include "prefs.h"

#include <glib-object.h>
#include <glib/gprintf.h>

#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <locale.h>
#include <time.h>
#include <unistd.h>

/**
 * The exit code we'll return to our parent process when we eventually die.
 */
static MetaExitCode meta_exit_code = META_EXIT_SUCCESS;

/**
 * Handle on the main loop, so that we have an easy way of shutting Marco
 * down.
 */
static GMainLoop *meta_main_loop = NULL;

/**
 * If set, Marco will spawn an identical copy of itself immediately
 * before quitting.
 */
static gboolean meta_restart_after_quit = FALSE;

static void prefs_changed_callback (MetaPreference pref,
                                    gpointer       data);

/**
 * Prints log messages. If Marco was compiled with backtrace support,
 * also prints a backtrace (see meta_print_backtrace()).
 *
 * \param log_domain  the domain the error occurred in (we ignore this)
 * \param log_level   the log level so that we can filter out less
 *                    important messages
 * \param message     the message to log
 * \param user_data   arbitrary data (we ignore this)
 */
static void
log_handler (const gchar   *log_domain,
             GLogLevelFlags log_level,
             const gchar   *message,
             gpointer       user_data)
{
  meta_warning ("Log level %d: %s\n", log_level, message);
  meta_print_backtrace ();
}

/**
 * Prints the version notice. This is shown when Marco is called
 * with the --version switch.
 */
static void
version (void)
{
  const int latest_year = 2009;
  char yearbuffer[256];
  GDate date;

  /* this is all so the string to translate stays constant.
   * see how much we love the translators.
   */
  g_date_set_dmy (&date, 1, G_DATE_JANUARY, latest_year);
  if (g_date_strftime (yearbuffer, sizeof (yearbuffer), "%Y", &date)==0)
    /* didn't work?  fall back to decimal representation */
    g_sprintf (yearbuffer, "%d", latest_year);

  g_print (_("marco %s\n"
             "Copyright (C) 2001-%s Havoc Pennington, Red Hat, Inc., and others\n"
             "This is free software; see the source for copying conditions.\n"
             "There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"),
           VERSION, yearbuffer);
  exit (0);
}

/**
 * Prints a list of which configure script options were used to
 * build this copy of Marco. This is actually always called
 * on startup, but it's all no-op unless we're in verbose mode
 * (see meta_set_verbose).
 */
static void
meta_print_compilation_info (void)
{
#ifdef HAVE_SHAPE
  meta_verbose ("Compiled with shape extension\n");
#else
  meta_verbose ("Compiled without shape extension\n");
#endif
#ifdef HAVE_XINERAMA
  meta_topic (META_DEBUG_XINERAMA, "Compiled with Xinerama extension\n");
#else
  meta_topic (META_DEBUG_XINERAMA, "Compiled without Xinerama extension\n");
#endif
#ifdef HAVE_XFREE_XINERAMA
  meta_topic (META_DEBUG_XINERAMA, " (using XFree86 Xinerama)\n");
#else
  meta_topic (META_DEBUG_XINERAMA, " (not using XFree86 Xinerama)\n");
#endif
#ifdef HAVE_SOLARIS_XINERAMA
  meta_topic (META_DEBUG_XINERAMA, " (using Solaris Xinerama)\n");
#else
  meta_topic (META_DEBUG_XINERAMA, " (not using Solaris Xinerama)\n");
#endif
#ifdef HAVE_XSYNC
  meta_verbose ("Compiled with sync extension\n");
#else
  meta_verbose ("Compiled without sync extension\n");
#endif
#ifdef HAVE_RANDR
  meta_verbose ("Compiled with randr extension\n");
#else
  meta_verbose ("Compiled without randr extension\n");
#endif
#ifdef HAVE_STARTUP_NOTIFICATION
  meta_verbose ("Compiled with startup notification\n");
#else
  meta_verbose ("Compiled without startup notification\n");
#endif
#ifdef HAVE_COMPOSITE_EXTENSIONS
  meta_verbose ("Compiled with composite extensions\n");
#else
  meta_verbose ("Compiled without composite extensions\n");
#endif
}

/**
 * Prints the version number, the current timestamp (not the
 * build date), the locale, the character encoding, and a list
 * of configure script options that were used to build this
 * copy of Marco. This is actually always called
 * on startup, but it's all no-op unless we're in verbose mode
 * (see meta_set_verbose).
 */
static void
meta_print_self_identity (void)
{
  char buf[256];
  GDate d;
  const char *charset;

  /* Version and current date. */
  g_date_clear (&d, 1);
  g_date_set_time_t (&d, time (NULL));
  g_date_strftime (buf, sizeof (buf), "%x", &d);
  meta_verbose ("Marco version %s running on %s\n",
    VERSION, buf);

  /* Locale and encoding. */
  g_get_charset (&charset);
  meta_verbose ("Running in locale \"%s\" with encoding \"%s\"\n",
    setlocale (LC_ALL, NULL), charset);

  /* Compilation settings. */
  meta_print_compilation_info ();
}

/**
 * The set of possible options that can be set on Marco's
 * command line. This type exists so that meta_parse_options() can
 * write to an instance of it.
 */
typedef struct
{
  gchar *save_file;
  gchar *display_name;
  gchar *client_id;
  gboolean replace_wm;
  gboolean disable_sm;
  gboolean print_version;
  gboolean sync;
  gboolean composite;
  gboolean no_composite;
  gboolean no_force_fullscreen;
} MetaArguments;

#ifdef HAVE_COMPOSITE_EXTENSIONS
#define COMPOSITE_OPTS_FLAGS 0
#else /* HAVE_COMPOSITE_EXTENSIONS */
/* No compositor, so don't show the arguments in --help */
#define COMPOSITE_OPTS_FLAGS G_OPTION_FLAG_HIDDEN
#endif /* HAVE_COMPOSITE_EXTENSIONS */

/**
 * Parses argc and argv and returns the
 * arguments that Marco understands in meta_args.
 *
 * The strange call signature has to be written like it is so
 * that g_option_context_parse() gets a chance to modify argc and
 * argv.
 *
 * \param argc  Pointer to the number of arguments Marco was given
 * \param argv  Pointer to the array of arguments Marco was given
 * \param meta_args  The result of parsing the arguments.
 **/
static void
meta_parse_options (int *argc, char ***argv,
                    MetaArguments *meta_args)
{
  MetaArguments my_args = {NULL, NULL, NULL,
                           FALSE, FALSE, FALSE, FALSE, FALSE};
  GOptionEntry options[] = {
    {
      "sm-disable", 0, 0, G_OPTION_ARG_NONE,
      &my_args.disable_sm,
      N_("Disable connection to session manager"),
      NULL
    },
    {
      "replace", 0, 0, G_OPTION_ARG_NONE,
      &my_args.replace_wm,
      N_("Replace the running window manager with Marco"),
      NULL
    },
    {
      "sm-client-id", 0, 0, G_OPTION_ARG_STRING,
      &my_args.client_id,
      N_("Specify session management ID"),
      "ID"
    },
    {
      "display", 'd', 0, G_OPTION_ARG_STRING,
      &my_args.display_name, N_("X Display to use"),
      "DISPLAY"
    },
    {
      "sm-save-file", 0, 0, G_OPTION_ARG_FILENAME,
      &my_args.save_file,
      N_("Initialize session from savefile"),
      "FILE"
    },
    {
      "version", 0, 0, G_OPTION_ARG_NONE,
      &my_args.print_version,
      N_("Print version"),
      NULL
    },
    {
      "sync", 0, 0, G_OPTION_ARG_NONE,
      &my_args.sync,
      N_("Make X calls synchronous"),
      NULL
    },
    {
      "composite", 'c', COMPOSITE_OPTS_FLAGS, G_OPTION_ARG_NONE,
      &my_args.composite,
      N_("Turn compositing on"),
      NULL
    },
    {
      "no-composite", 0, COMPOSITE_OPTS_FLAGS, G_OPTION_ARG_NONE,
      &my_args.no_composite,
      N_("Turn compositing off"),
      NULL
    },
    {
      "no-force-fullscreen", 0, COMPOSITE_OPTS_FLAGS, G_OPTION_ARG_NONE,
      &my_args.no_force_fullscreen,
      N_("Don't make fullscreen windows that are maximized and have no decorations"),
      NULL
    },
    {NULL}
  };
  GOptionContext *ctx;
  GError *error = NULL;

  ctx = g_option_context_new (NULL);
  g_option_context_add_main_entries (ctx, options, "marco");
  if (!g_option_context_parse (ctx, argc, argv, &error))
    {
      g_print ("marco: %s\n", error->message);
      exit(1);
    }
  g_option_context_free (ctx);
  /* Return the parsed options through the meta_args param. */
  *meta_args = my_args;
}

/**
 * Selects which display Marco should use. It first tries to use
 * display_name as the display. If display_name is NULL then
 * try to use the environment variable MARCO_DISPLAY. If that
 * also is NULL, use the default - :0.0
 */
static void
meta_select_display (gchar *display_name)
{
  gchar *envVar = "";
  if (display_name)
    envVar = g_strconcat ("DISPLAY=", display_name, NULL);
  else if (g_getenv ("MARCO_DISPLAY"))
    envVar = g_strconcat ("DISPLAY=",
      g_getenv ("MARCO_DISPLAY"), NULL);
  /* DO NOT FREE envVar, putenv() sucks */
  putenv (envVar);
}

static void
meta_finalize (void)
{
  MetaDisplay *display = meta_get_display();
  if (display)
    meta_display_close (display,
                        CurrentTime); /* I doubt correct timestamps matter here */

  meta_session_shutdown ();
}

static int sigterm_pipe_fds[2] = { -1, -1 };

static void
sigterm_handler (int signum)
{
  if (sigterm_pipe_fds[1] >= 0)
    {
      G_GNUC_UNUSED int dummy;

      dummy = write (sigterm_pipe_fds[1], "", 1);
      close (sigterm_pipe_fds[1]);
      sigterm_pipe_fds[1] = -1;
    }
}

static gboolean
on_sigterm (void)
{
  meta_quit (META_EXIT_SUCCESS);
  return FALSE;
}

/**
 * This is where the story begins. It parses commandline options and
 * environment variables, sets up the screen, hands control off to
 * GTK, and cleans up afterwards.
 *
 * \param argc Number of arguments (as usual)
 * \param argv Array of arguments (as usual)
 *
 * \bug It's a bit long. It would be good to split it out into separate
 * functions.
 */
int
main (int argc, char **argv)
{
  struct sigaction act;
  sigset_t empty_mask;
  MetaArguments meta_args;
  const gchar *log_domains[] = {
    NULL, G_LOG_DOMAIN, "Gtk", "Gdk", "GLib",
    "Pango", "GLib-GObject", "GThread"
  };
  guint i;
  GIOChannel *channel;

  if (setlocale (LC_ALL, "") == NULL)
    meta_warning ("Locale not understood by C library, internationalization will not work\n");

  sigemptyset (&empty_mask);
  act.sa_handler = SIG_IGN;
  act.sa_mask    = empty_mask;
  act.sa_flags   = 0;
  if (sigaction (SIGPIPE,  &act, NULL) < 0)
    g_printerr ("Failed to register SIGPIPE handler: %s\n",
                g_strerror (errno));
#ifdef SIGXFSZ
  if (sigaction (SIGXFSZ,  &act, NULL) < 0)
    g_printerr ("Failed to register SIGXFSZ handler: %s\n",
                g_strerror (errno));
#endif

  if (pipe (sigterm_pipe_fds) != 0)
    g_printerr ("Failed to create SIGTERM pipe: %s\n",
                g_strerror (errno));

  channel = g_io_channel_unix_new (sigterm_pipe_fds[0]);
  g_io_channel_set_flags (channel, G_IO_FLAG_NONBLOCK, NULL);
  g_io_add_watch (channel, G_IO_IN, (GIOFunc) on_sigterm, NULL);
  g_io_channel_set_close_on_unref (channel, TRUE);
  g_io_channel_unref (channel);

  act.sa_handler = &sigterm_handler;
  if (sigaction (SIGTERM, &act, NULL) < 0)
    g_printerr ("Failed to register SIGTERM handler: %s\n",
		g_strerror (errno));

  if (g_getenv ("MARCO_VERBOSE"))
    meta_set_verbose (TRUE);
  if (g_getenv ("MARCO_DEBUG"))
    meta_set_debugging (TRUE);

  if (g_get_home_dir ())
    if (chdir (g_get_home_dir ()) < 0)
      meta_warning ("Could not change to home directory %s.\n",
                    g_get_home_dir ());

  meta_print_self_identity ();

  bindtextdomain (GETTEXT_PACKAGE, MARCO_LOCALEDIR);
  bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
  textdomain (GETTEXT_PACKAGE);

  /* Parse command line arguments.*/
  meta_parse_options (&argc, &argv, &meta_args);

  meta_set_syncing (meta_args.sync || (g_getenv ("MARCO_SYNC") != NULL));

  if (meta_args.print_version)
    version ();

  meta_select_display (meta_args.display_name);

  if (meta_args.replace_wm)
    meta_set_replace_current_wm (TRUE);

  if (meta_args.save_file && meta_args.client_id)
    meta_fatal ("Can't specify both SM save file and SM client id\n");

  meta_main_loop = g_main_loop_new (NULL, FALSE);

  meta_ui_init (&argc, &argv);

  /* must be after UI init so we can override GDK handlers */
  meta_errors_init ();

  /* Load prefs */
  meta_prefs_init ();
  meta_prefs_add_listener (prefs_changed_callback, NULL);


#if 1

  for (i=0; i<G_N_ELEMENTS(log_domains); i++)
    g_log_set_handler (log_domains[i],
                       G_LOG_LEVEL_MASK | G_LOG_FLAG_FATAL | G_LOG_FLAG_RECURSION,
                       log_handler, NULL);

#endif

  if (g_getenv ("MARCO_G_FATAL_WARNINGS") != NULL)
    g_log_set_always_fatal (G_LOG_LEVEL_MASK);

  meta_ui_set_current_theme (meta_prefs_get_theme (), FALSE);

  /* Try to find some theme that'll work if the theme preference
   * doesn't exist.  First try Simple (the default theme) then just
   * try anything in the themes directory.
   */
  if (!meta_ui_have_a_theme ())
    meta_ui_set_current_theme ("Simple", FALSE);

  if (!meta_ui_have_a_theme ())
    {
      const char *dir_entry = NULL;
      GError *err = NULL;
      GDir   *themes_dir = NULL;

      if (!(themes_dir = g_dir_open (MARCO_DATADIR"/themes", 0, &err)))
        {
          meta_fatal (_("Failed to scan themes directory: %s\n"), err->message);
          g_error_free (err);
        }
      else
        {
          while (((dir_entry = g_dir_read_name (themes_dir)) != NULL) &&
                 (!meta_ui_have_a_theme ()))
            {
              meta_ui_set_current_theme (dir_entry, FALSE);
            }

          g_dir_close (themes_dir);
        }
    }

  if (!meta_ui_have_a_theme ())
    meta_fatal (_("Could not find a theme! Be sure %s exists and contains the usual themes.\n"),
                MARCO_DATADIR"/themes");

  /* Connect to SM as late as possible - but before managing display,
   * or we might try to manage a window before we have the session
   * info
   */
  if (!meta_args.disable_sm)
    {
      if (meta_args.client_id == NULL)
        {
          const gchar *desktop_autostart_id;

          desktop_autostart_id = g_getenv ("DESKTOP_AUTOSTART_ID");

          if (desktop_autostart_id != NULL)
            meta_args.client_id = g_strdup (desktop_autostart_id);
        }

      /* Unset DESKTOP_AUTOSTART_ID in order to avoid child processes to
       * use the same client id. */
      g_unsetenv ("DESKTOP_AUTOSTART_ID");

      meta_session_init (meta_args.client_id, meta_args.save_file);
    }
  /* Free memory possibly allocated by the argument parsing which are
   * no longer needed.
   */
  g_free (meta_args.save_file);
  g_free (meta_args.display_name);
  g_free (meta_args.client_id);

  if (meta_args.composite || meta_args.no_composite)
    meta_prefs_set_force_compositing_manager (meta_args.composite);

  if (meta_args.no_force_fullscreen)
    meta_prefs_set_force_fullscreen (FALSE);

  if (!meta_display_open ())
    meta_exit (META_EXIT_ERROR);

  g_main_loop_run (meta_main_loop);

  meta_finalize ();

  if (meta_restart_after_quit)
    {
      GError *err;

      err = NULL;
      if (!g_spawn_async (NULL,
                          argv,
                          NULL,
                          G_SPAWN_SEARCH_PATH,
                          NULL,
                          NULL,
                          NULL,
                          &err))
        {
          meta_fatal (_("Failed to restart: %s\n"),
                      err->message);
          g_error_free (err); /* not reached anyhow */
          meta_exit_code = META_EXIT_ERROR;
        }
    }

  return meta_exit_code;
}

/**
 * Stops Marco. This tells the event loop to stop processing; it is rather
 * dangerous to use this rather than meta_restart() because this will leave
 * the user with no window manager. We generally do this only if, for example,
 * the session manager asks us to; we assume the session manager knows what
 * it's talking about.
 *
 * \param code The success or failure code to return to the calling process.
 */
void
meta_quit (MetaExitCode code)
{
  meta_exit_code = code;

  if (g_main_loop_is_running (meta_main_loop))
    g_main_loop_quit (meta_main_loop);
}

/**
 * Restarts Marco. In practice, this tells the event loop to stop
 * processing, having first set the meta_restart_after_quit flag which
 * tells Marco to spawn an identical copy of itself before quitting.
 * This happens on receipt of a _MARCO_RESTART_MESSAGE client event.
 */
void
meta_restart (void)
{
  meta_restart_after_quit = TRUE;
  meta_quit (META_EXIT_SUCCESS);
}

/**
 * Called on pref changes. (One of several functions of its kind and purpose.)
 *
 * \bug Why are these particular prefs handled in main.c and not others?
 * Should they be?
 *
 * \param pref  Which preference has changed
 * \param data  Arbitrary data (which we ignore)
 */
static void
prefs_changed_callback (MetaPreference pref,
                        gpointer       data)
{
  switch (pref)
    {
    case META_PREF_THEME:
      meta_ui_set_current_theme (meta_prefs_get_theme (), FALSE);
      meta_display_retheme_all ();
      break;

    case META_PREF_CURSOR_THEME:
    case META_PREF_CURSOR_SIZE:
      meta_display_set_cursor_theme (meta_prefs_get_cursor_theme (),
				     meta_prefs_get_cursor_size ());
      break;
    default:
      /* handled elsewhere or otherwise */
      break;
    }
}