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