src/main.c

   1 /*
   2    Main program for the Midnight Commander
   3
   4    Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
   5    2003, 2004, 2005, 2006, 2007, 2009, 2011
   6    The Free Software Foundation, Inc.
   7
   8    Written by:
   9    Miguel de Icaza, 1994, 1995, 1996, 1997
  10    Janne Kukonlehto, 1994, 1995
  11    Norbert Warmuth, 1997
  12
  13    This file is part of the Midnight Commander.
  14
  15    The Midnight Commander is free software: you can redistribute it
  16    and/or modify it under the terms of the GNU General Public License as
  17    published by the Free Software Foundation, either version 3 of the License,
  18    or (at your option) any later version.
  19
  20    The Midnight Commander is distributed in the hope that it will be useful,
  21    but WITHOUT ANY WARRANTY; without even the implied warranty of
  22    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23    GNU General Public License for more details.
  24
  25    You should have received a copy of the GNU General Public License
  26    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  27  */
  28
  29 /** \file main.c
  30  *  \brief Source: this is a main module
  31  */
  32
  33 #include <config.h>
  34
  35 #include <ctype.h>
  36 #include <errno.h>
  37 #include <locale.h>
  38 #include <pwd.h>                /* for username in xterm title */
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <sys/wait.h>
  43 #include <signal.h>
  44
  45 #include "lib/global.h"
  46
  47 #include "lib/event.h"
  48 #include "lib/tty/tty.h"
  49 #include "lib/tty/key.h"        /* For init_key() */
  50 #include "lib/tty/mouse.h"      /* init_mouse() */
  51 #include "lib/skin.h"
  52 #include "lib/filehighlight.h"
  53 #include "lib/fileloc.h"
  54 #include "lib/strutil.h"
  55 #include "lib/util.h"
  56 #include "lib/vfs/vfs.h"        /* vfs_init(), vfs_shut() */
  57
  58 #include "filemanager/midnight.h"       /* current_panel */
  59 #include "filemanager/treestore.h"      /* tree_store_save */
  60 #include "filemanager/layout.h" /* command_prompt */
  61 #include "filemanager/ext.h"    /* flush_extension_file() */
  62 #include "filemanager/command.h"        /* cmdline */
  63 #include "filemanager/panel.h"  /* panalized_panel */
  64
  65 #include "vfs/plugins_init.h"
  66
  67 #include "events_init.h"
  68 #include "args.h"
  69 #ifdef ENABLE_SUBSHELL
  70 #include "subshell.h"
  71 #endif
  72 #include "setup.h"              /* load_setup() */
  73
  74 #ifdef HAVE_CHARSET
  75 #include "lib/charsets.h"
  76 #include "selcodepage.h"
  77 #endif /* HAVE_CHARSET */
  78
  79 #include "consaver/cons.saver.h"        /* cons_saver_pid */
  80
  81 /*** global variables ****************************************************************************/
  82
  83 /*** file scope macro definitions ****************************************************************/
  84
  85 /*** file scope type declarations ****************************************************************/
  86
  87 /*** file scope variables ************************************************************************/
  88
  89 /*** file scope functions ************************************************************************/
  90 /* --------------------------------------------------------------------------------------------- */
  91
  92 static void
  93 check_codeset (void)
  94 {
  95     const char *current_system_codepage = NULL;
  96
  97     current_system_codepage = str_detect_termencoding ();
  98
  99 #ifdef HAVE_CHARSET
 100     {
 101         const char *_display_codepage;
 102
 103         _display_codepage = get_codepage_id (mc_global.display_codepage);
 104
 105         if (strcmp (_display_codepage, current_system_codepage) != 0)
 106         {
 107             mc_global.display_codepage = get_codepage_index (current_system_codepage);
 108             if (mc_global.display_codepage == -1)
 109                 mc_global.display_codepage = 0;
 110
 111             mc_config_set_string (mc_main_config, CONFIG_MISC_SECTION, "display_codepage",
 112                                   cp_display);
 113         }
 114     }
 115 #endif
 116
 117     mc_global.utf8_display = str_isutf8 (current_system_codepage);
 118 }
 119
 120 /* --------------------------------------------------------------------------------------------- */
 121
 122 /** POSIX version.  The only version we support.  */
 123 static void
 124 OS_Setup (void)
 125 {
 126     const char *shell_env;
 127     const char *datadir_env;
 128
 129     shell_env = getenv ("SHELL");
 130     if ((shell_env == NULL) || (shell_env[0] == '\0'))
 131     {
 132         struct passwd *pwd;
 133
 134         pwd = getpwuid (geteuid ());
 135         if (pwd != NULL)
 136             mc_global.tty.shell = g_strdup (pwd->pw_shell);
 137     }
 138     else
 139         mc_global.tty.shell = g_strdup (shell_env);
 140
 141     if ((mc_global.tty.shell == NULL) || (mc_global.tty.shell[0] == '\0'))
 142     {
 143         g_free (mc_global.tty.shell);
 144         mc_global.tty.shell = g_strdup ("/bin/sh");
 145     }
 146
 147     /* This is the directory, where MC was installed, on Unix this is DATADIR */
 148     /* and can be overriden by the MC_DATADIR environment variable */
 149     datadir_env = g_getenv ("MC_DATADIR");
 150     if (datadir_env != NULL)
 151         mc_global.sysconfig_dir = g_strdup (datadir_env);
 152     else
 153         mc_global.sysconfig_dir = g_strdup (SYSCONFDIR);
 154
 155     mc_global.share_data_dir = g_strdup (DATADIR);
 156
 157     /* Set up temporary directory */
 158     mc_tmpdir ();
 159 }
 160
 161 /* --------------------------------------------------------------------------------------------- */
 162
 163 static void
 164 sigchld_handler_no_subshell (int sig)
 165 {
 166 #ifdef __linux__
 167     int pid, status;
 168
 169     if (!mc_global.tty.console_flag != '\0')
 170         return;
 171
 172     /* COMMENT: if it were true that after the call to handle_console(..INIT)
 173        the value of mc_global.tty.console_flag never changed, we could simply not install
 174        this handler at all if (!mc_global.tty.console_flag && !mc_global.tty.use_subshell). */
 175
 176     /* That comment is no longer true.  We need to wait() on a sigchld
 177        handler (that's at least what the tarfs code expects currently). */
 178
 179     pid = waitpid (cons_saver_pid, &status, WUNTRACED | WNOHANG);
 180
 181     if (pid == cons_saver_pid)
 182     {
 183
 184         if (WIFSTOPPED (status))
 185         {
 186             /* Someone has stopped cons.saver - restart it */
 187             kill (pid, SIGCONT);
 188         }
 189         else
 190         {
 191             /* cons.saver has died - disable console saving */
 192             handle_console (CONSOLE_DONE);
 193             mc_global.tty.console_flag = '\0';
 194         }
 195     }
 196     /* If we got here, some other child exited; ignore it */
 197 #endif /* __linux__ */
 198
 199     (void) sig;
 200 }
 201
 202 /* --------------------------------------------------------------------------------------------- */
 203
 204 static void
 205 init_sigchld (void)
 206 {
 207     struct sigaction sigchld_action;
 208
 209     sigchld_action.sa_handler =
 210 #ifdef ENABLE_SUBSHELL
 211         mc_global.tty.use_subshell ? sigchld_handler :
 212 #endif /* ENABLE_SUBSHELL */
 213         sigchld_handler_no_subshell;
 214
 215     sigemptyset (&sigchld_action.sa_mask);
 216
 217 #ifdef SA_RESTART
 218     sigchld_action.sa_flags = SA_RESTART;
 219 #else
 220     sigchld_action.sa_flags = 0;
 221 #endif /* !SA_RESTART */
 222
 223     if (sigaction (SIGCHLD, &sigchld_action, NULL) == -1)
 224     {
 225 #ifdef ENABLE_SUBSHELL
 226         /*
 227          * This may happen on QNX Neutrino 6, where SA_RESTART
 228          * is defined but not implemented.  Fallback to no subshell.
 229          */
 230         mc_global.tty.use_subshell = FALSE;
 231 #endif /* ENABLE_SUBSHELL */
 232     }
 233 }
 234
 235 /* --------------------------------------------------------------------------------------------- */
 236 /*** public functions ****************************************************************************/
 237 /* --------------------------------------------------------------------------------------------- */
 238
 239 int
 240 main (int argc, char *argv[])
 241 {
 242     GError *error = NULL;
 243     gboolean config_migrated = FALSE;
 244     char *config_migrate_msg;
 245     int exit_code = EXIT_FAILURE;
 246
 247     /* We had LC_CTYPE before, LC_ALL includs LC_TYPE as well */
 248 #ifdef HAVE_SETLOCALE
 249     (void) setlocale (LC_ALL, "");
 250 #endif
 251     (void) bindtextdomain (PACKAGE, LOCALEDIR);
 252     (void) textdomain (PACKAGE);
 253
 254     /* do this before args parsing */
 255     str_init_strings (NULL);
 256
 257     if (!mc_args_parse (&argc, &argv, "mc", &error))
 258     {
 259       startup_exit_falure:
 260         fprintf (stderr, _("Failed to run:\n%s\n"), error->message);
 261         g_error_free (error);
 262         g_free (mc_global.tty.shell);
 263       startup_exit_ok:
 264         str_uninit_strings ();
 265         return exit_code;
 266     }
 267
 268     /* do this before mc_args_show_info () to view paths in the --datadir-info output */
 269     OS_Setup ();
 270
 271     if (!g_path_is_absolute (mc_config_get_home_dir ()))
 272     {
 273         error = g_error_new (MC_ERROR, 0, "%s: %s", _("Home directory path is not absolute"),
 274                              mc_config_get_home_dir ());
 275         mc_event_deinit (NULL);
 276         goto startup_exit_falure;
 277     }
 278
 279     if (!mc_args_show_info ())
 280     {
 281         exit_code = EXIT_SUCCESS;
 282         goto startup_exit_ok;
 283     }
 284
 285     if (!events_init (&error))
 286         goto startup_exit_falure;
 287
 288     mc_config_init_config_paths (&error);
 289     if (error == NULL)
 290         config_migrated = mc_config_migrate_from_old_place (&error, &config_migrate_msg);
 291     if (error != NULL)
 292     {
 293         mc_event_deinit (NULL);
 294         goto startup_exit_falure;
 295     }
 296
 297     vfs_init ();
 298     vfs_plugins_init ();
 299     vfs_setup_work_dir ();
 300
 301     /* do this after vfs initialization due to mc_setctl() call in mc_setup_by_args() */
 302     if (!mc_setup_by_args (argc, argv, &error))
 303     {
 304         vfs_shut ();
 305         mc_event_deinit (NULL);
 306         goto startup_exit_falure;
 307     }
 308
 309     /* check terminal type
 310      * $TEMR must be set and not empty
 311      * mc_global.tty.xterm_flag is used in init_key() and tty_init()
 312      * Do this after mc_args_handle() where mc_args__force_xterm is set up.
 313      */
 314     mc_global.tty.xterm_flag = tty_check_term (mc_args__force_xterm);
 315
 316     /* NOTE: This has to be called before tty_init or whatever routine
 317        calls any define_sequence */
 318     init_key ();
 319
 320     /* Must be done before installing the SIGCHLD handler [[FIXME]] */
 321     handle_console (CONSOLE_INIT);
 322
 323 #ifdef ENABLE_SUBSHELL
 324     /* Don't use subshell when invoked as viewer or editor */
 325     if (mc_global.mc_run_mode != MC_RUN_FULL)
 326         mc_global.tty.use_subshell = FALSE;
 327
 328     if (mc_global.tty.use_subshell)
 329         subshell_get_console_attributes ();
 330 #endif /* ENABLE_SUBSHELL */
 331
 332     /* Install the SIGCHLD handler; must be done before init_subshell() */
 333     init_sigchld ();
 334
 335     /* We need this, since ncurses endwin () doesn't restore the signals */
 336     save_stop_handler ();
 337
 338     /* Must be done before init_subshell, to set up the terminal size: */
 339     /* FIXME: Should be removed and LINES and COLS computed on subshell */
 340     tty_init (!mc_args__nomouse, mc_global.tty.xterm_flag);
 341
 342     load_setup ();
 343
 344     /* start check mc_global.display_codepage and mc_global.source_codepage */
 345     check_codeset ();
 346
 347     /* Removing this from the X code let's us type C-c */
 348     load_key_defs ();
 349
 350     load_keymap_defs (!mc_args__nokeymap);
 351
 352     macros_list = g_array_new (TRUE, FALSE, sizeof (macros_t));
 353
 354     tty_init_colors (mc_global.tty.disable_colors, mc_args__force_colors);
 355
 356     mc_skin_init (&error);
 357     if (error != NULL)
 358     {
 359         message (D_ERROR, _("Warning"), "%s", error->message);
 360         g_error_free (error);
 361         error = NULL;
 362     }
 363
 364     dlg_set_default_colors ();
 365
 366 #ifdef ENABLE_SUBSHELL
 367     /* Done here to ensure that the subshell doesn't  */
 368     /* inherit the file descriptors opened below, etc */
 369     if (mc_global.tty.use_subshell)
 370         init_subshell ();
 371 #endif /* ENABLE_SUBSHELL */
 372
 373     /* Also done after init_subshell, to save any shell init file messages */
 374     if (mc_global.tty.console_flag != '\0')
 375         handle_console (CONSOLE_SAVE);
 376
 377     if (mc_global.tty.alternate_plus_minus)
 378         application_keypad_mode ();
 379
 380     /* Done after subshell initialization to allow select and paste text by mouse
 381        w/o Shift button in subshell in the native console */
 382     init_mouse ();
 383
 384     /* subshell_prompt is NULL here */
 385     mc_prompt = (geteuid () == 0) ? "# " : "$ ";
 386
 387     if (config_migrated)
 388     {
 389         message (D_ERROR, _("Warning"), "%s", config_migrate_msg);
 390         g_free (config_migrate_msg);
 391     }
 392
 393     /* Program main loop */
 394     if (mc_global.midnight_shutdown)
 395         exit_code = EXIT_SUCCESS;
 396     else
 397         exit_code = do_nc ()? EXIT_SUCCESS : EXIT_FAILURE;
 398
 399     /* Save the tree store */
 400     (void) tree_store_save ();
 401
 402     free_keymap_defs ();
 403
 404     /* Virtual File System shutdown */
 405     vfs_shut ();
 406
 407     flush_extension_file ();    /* does only free memory */
 408
 409     mc_skin_deinit ();
 410     tty_colors_done ();
 411
 412     tty_shutdown ();
 413
 414     done_setup ();
 415
 416     if (mc_global.tty.console_flag != '\0' && (quit & SUBSHELL_EXIT) == 0)
 417         handle_console (CONSOLE_RESTORE);
 418     if (mc_global.tty.alternate_plus_minus)
 419         numeric_keypad_mode ();
 420
 421     (void) signal (SIGCHLD, SIG_DFL);   /* Disable the SIGCHLD handler */
 422
 423     if (mc_global.tty.console_flag != '\0')
 424         handle_console (CONSOLE_DONE);
 425
 426     if (mc_global.mc_run_mode == MC_RUN_FULL && mc_args__last_wd_file != NULL
 427         && last_wd_string != NULL && !print_last_revert)
 428     {
 429         int last_wd_fd;
 430
 431         last_wd_fd = open (mc_args__last_wd_file, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL,
 432                            S_IRUSR | S_IWUSR);
 433         if (last_wd_fd != -1)
 434         {
 435             ssize_t ret1;
 436             int ret2;
 437             ret1 = write (last_wd_fd, last_wd_string, strlen (last_wd_string));
 438             ret2 = close (last_wd_fd);
 439             (void) ret1;
 440             (void) ret2;
 441         }
 442     }
 443     g_free (last_wd_string);
 444
 445     g_free (mc_global.tty.shell);
 446
 447     done_key ();
 448
 449     if (macros_list != NULL)
 450     {
 451         guint i;
 452         macros_t *macros;
 453         for (i = 0; i < macros_list->len; i++)
 454         {
 455             macros = &g_array_index (macros_list, struct macros_t, i);
 456             if (macros != NULL && macros->macro != NULL)
 457                 (void) g_array_free (macros->macro, FALSE);
 458         }
 459         (void) g_array_free (macros_list, TRUE);
 460     }
 461
 462     str_uninit_strings ();
 463
 464     if (mc_global.mc_run_mode != MC_RUN_EDITOR)
 465         g_free (mc_run_param0);
 466     else
 467     {
 468         g_list_foreach ((GList *) mc_run_param0, (GFunc) mcedit_arg_free, NULL);
 469         g_list_free ((GList *) mc_run_param0);
 470     }
 471     g_free (mc_run_param1);
 472
 473     mc_config_deinit_config_paths ();
 474
 475     (void) mc_event_deinit (&error);
 476     if (error != NULL)
 477     {
 478         fprintf (stderr, _("\nFailed while close:\n%s\n"), error->message);
 479         g_error_free (error);
 480         exit_code = EXIT_FAILURE;
 481     }
 482
 483     (void) putchar ('\n');      /* Hack to make shell's prompt start at left of screen */
 484
 485     return exit_code;
 486 }
 487
 488 /* --------------------------------------------------------------------------------------------- */