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     int exit_code = EXIT_FAILURE;
 242
 243     /* We had LC_CTYPE before, LC_ALL includs LC_TYPE as well */
 244 #ifdef HAVE_SETLOCALE
 245     (void) setlocale (LC_ALL, "");
 246 #endif
 247     (void) bindtextdomain (PACKAGE, LOCALEDIR);
 248     (void) textdomain (PACKAGE);
 249
 250     /* do this before args parsing */
 251     str_init_strings (NULL);
 252
 253     if (!mc_args_parse (&argc, &argv, "mc", &error))
 254     {
 255       startup_exit_falure:
 256         fprintf (stderr, _("Failed to run:\n%s\n"), error->message);
 257         g_error_free (error);
 258         g_free (shell);
 259       startup_exit_ok:
 260         str_uninit_strings ();
 261         return exit_code;
 262     }
 263
 264     /* do this before mc_args_show_info () to view paths in the --datadir-info output */
 265     OS_Setup ();
 266
 267     if (!g_path_is_absolute (mc_config_get_home_dir ()))
 268     {
 269         error = g_error_new (MC_ERROR, 0, "%s: %s", _("Home directory path is not absolute"),
 270                              mc_config_get_home_dir ());
 271         mc_event_deinit (NULL);
 272         goto startup_exit_falure;
 273     }
 274
 275     if (!mc_args_show_info ())
 276     {
 277         exit_code = EXIT_SUCCESS;
 278         goto startup_exit_ok;
 279     }
 280
 281     if (!events_init (&error))
 282         goto startup_exit_falure;
 283
 284     mc_config_init_config_paths (&error);
 285     if (error == NULL && mc_config_deprecated_dir_present ())
 286         mc_config_migrate_from_old_place (&error);
 287     if (error != NULL)
 288     {
 289         mc_event_deinit (NULL);
 290         goto startup_exit_falure;
 291     }
 292
 293     vfs_init ();
 294     vfs_plugins_init ();
 295     vfs_setup_work_dir ();
 296
 297     /* do this after vfs initialization due to mc_setctl() call in mc_setup_by_args() */
 298     if (!mc_setup_by_args (argc, argv, &error))
 299     {
 300         vfs_shut ();
 301         mc_event_deinit (NULL);
 302         goto startup_exit_falure;
 303     }
 304
 305     /* check terminal type
 306      * $TEMR must be set and not empty
 307      * mc_global.tty.xterm_flag is used in init_key() and tty_init()
 308      * Do this after mc_args_handle() where mc_args__force_xterm is set up.
 309      */
 310     mc_global.tty.xterm_flag = tty_check_term (mc_args__force_xterm);
 311
 312     /* NOTE: This has to be called before tty_init or whatever routine
 313        calls any define_sequence */
 314     init_key ();
 315
 316     /* Must be done before installing the SIGCHLD handler [[FIXME]] */
 317     handle_console (CONSOLE_INIT);
 318
 319 #ifdef ENABLE_SUBSHELL
 320     /* Don't use subshell when invoked as viewer or editor */
 321     if (mc_global.mc_run_mode != MC_RUN_FULL)
 322         mc_global.tty.use_subshell = FALSE;
 323
 324     if (mc_global.tty.use_subshell)
 325         subshell_get_console_attributes ();
 326 #endif /* ENABLE_SUBSHELL */
 327
 328     /* Install the SIGCHLD handler; must be done before init_subshell() */
 329     init_sigchld ();
 330
 331     /* We need this, since ncurses endwin () doesn't restore the signals */
 332     save_stop_handler ();
 333
 334     /* Must be done before init_subshell, to set up the terminal size: */
 335     /* FIXME: Should be removed and LINES and COLS computed on subshell */
 336     tty_init (!mc_args__nomouse, mc_global.tty.xterm_flag);
 337
 338     load_setup ();
 339
 340     /* start check mc_global.display_codepage and mc_global.source_codepage */
 341     check_codeset ();
 342
 343     /* Removing this from the X code let's us type C-c */
 344     load_key_defs ();
 345
 346     load_keymap_defs (!mc_args__nokeymap);
 347
 348     macros_list = g_array_new (TRUE, FALSE, sizeof (macros_t));
 349
 350     tty_init_colors (mc_global.tty.disable_colors, mc_args__force_colors);
 351
 352     mc_skin_init (&error);
 353     if (error != NULL)
 354     {
 355         message (D_ERROR, _("Warning"), "%s", error->message);
 356         g_error_free (error);
 357         error = NULL;
 358     }
 359
 360     dlg_set_default_colors ();
 361
 362 #ifdef ENABLE_SUBSHELL
 363     /* Done here to ensure that the subshell doesn't  */
 364     /* inherit the file descriptors opened below, etc */
 365     if (mc_global.tty.use_subshell)
 366         init_subshell ();
 367
 368 #endif /* ENABLE_SUBSHELL */
 369
 370     /* Also done after init_subshell, to save any shell init file messages */
 371     if (mc_global.tty.console_flag != '\0')
 372         handle_console (CONSOLE_SAVE);
 373
 374     if (mc_global.tty.alternate_plus_minus)
 375         application_keypad_mode ();
 376
 377 #ifdef ENABLE_SUBSHELL
 378     if (mc_global.tty.use_subshell)
 379     {
 380         mc_prompt = strip_ctrl_codes (subshell_prompt);
 381         if (mc_prompt == NULL)
 382             mc_prompt = (geteuid () == 0) ? "# " : "$ ";
 383     }
 384     else
 385 #endif /* ENABLE_SUBSHELL */
 386         mc_prompt = (geteuid () == 0) ? "# " : "$ ";
 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 /* --------------------------------------------------------------------------------------------- */