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
 133         pwd = getpwuid (geteuid ());
 134         if (pwd != NULL)
 135             mc_global.tty.shell = g_strdup (pwd->pw_shell);
 136     }
 137     else
 138         mc_global.tty.shell = g_strdup (shell_env);
 139
 140     if ((mc_global.tty.shell == NULL) || (mc_global.tty.shell[0] == '\0'))
 141     {
 142         g_free (mc_global.tty.shell);
 143         mc_global.tty.shell = g_strdup ("/bin/sh");
 144     }
 145
 146     /* This is the directory, where MC was installed, on Unix this is DATADIR */
 147     /* and can be overriden by the MC_DATADIR environment variable */
 148     datadir_env = g_getenv ("MC_DATADIR");
 149     if (datadir_env != NULL)
 150         mc_global.sysconfig_dir = g_strdup (datadir_env);
 151     else
 152         mc_global.sysconfig_dir = g_strdup (SYSCONFDIR);
 153
 154     mc_global.share_data_dir = g_strdup (DATADIR);
 155
 156     /* Set up temporary directory */
 157     mc_tmpdir ();
 158 }
 159
 160 /* --------------------------------------------------------------------------------------------- */
 161
 162 static void
 163 sigchld_handler_no_subshell (int sig)
 164 {
 165 #ifdef __linux__
 166     int pid, status;
 167
 168     if (!mc_global.tty.console_flag != '\0')
 169         return;
 170
 171     /* COMMENT: if it were true that after the call to handle_console(..INIT)
 172        the value of mc_global.tty.console_flag never changed, we could simply not install
 173        this handler at all if (!mc_global.tty.console_flag && !mc_global.tty.use_subshell). */
 174
 175     /* That comment is no longer true.  We need to wait() on a sigchld
 176        handler (that's at least what the tarfs code expects currently). */
 177
 178     pid = waitpid (cons_saver_pid, &status, WUNTRACED | WNOHANG);
 179
 180     if (pid == cons_saver_pid)
 181     {
 182
 183         if (WIFSTOPPED (status))
 184         {
 185             /* Someone has stopped cons.saver - restart it */
 186             kill (pid, SIGCONT);
 187         }
 188         else
 189         {
 190             /* cons.saver has died - disable console saving */
 191             handle_console (CONSOLE_DONE);
 192             mc_global.tty.console_flag = '\0';
 193         }
 194     }
 195     /* If we got here, some other child exited; ignore it */
 196 #endif /* __linux__ */
 197
 198     (void) sig;
 199 }
 200
 201 /* --------------------------------------------------------------------------------------------- */
 202
 203 static void
 204 init_sigchld (void)
 205 {
 206     struct sigaction sigchld_action;
 207
 208     sigchld_action.sa_handler =
 209 #ifdef ENABLE_SUBSHELL
 210         mc_global.tty.use_subshell ? sigchld_handler :
 211 #endif /* ENABLE_SUBSHELL */
 212         sigchld_handler_no_subshell;
 213
 214     sigemptyset (&sigchld_action.sa_mask);
 215
 216 #ifdef SA_RESTART
 217     sigchld_action.sa_flags = SA_RESTART;
 218 #else
 219     sigchld_action.sa_flags = 0;
 220 #endif /* !SA_RESTART */
 221
 222     if (sigaction (SIGCHLD, &sigchld_action, NULL) == -1)
 223     {
 224 #ifdef ENABLE_SUBSHELL
 225         /*
 226          * This may happen on QNX Neutrino 6, where SA_RESTART
 227          * is defined but not implemented.  Fallback to no subshell.
 228          */
 229         mc_global.tty.use_subshell = FALSE;
 230 #endif /* ENABLE_SUBSHELL */
 231     }
 232 }
 233
 234 /* --------------------------------------------------------------------------------------------- */
 235 /*** public functions ****************************************************************************/
 236 /* --------------------------------------------------------------------------------------------- */
 237
 238 int
 239 main (int argc, char *argv[])
 240 {
 241     GError *error = NULL;
 242     gboolean config_migrated = FALSE;
 243     char *config_migrate_msg;
 244     int exit_code = EXIT_FAILURE;
 245
 246     /* We had LC_CTYPE before, LC_ALL includs LC_TYPE as well */
 247 #ifdef HAVE_SETLOCALE
 248     (void) setlocale (LC_ALL, "");
 249 #endif
 250     (void) bindtextdomain (PACKAGE, LOCALEDIR);
 251     (void) textdomain (PACKAGE);
 252
 253     /* do this before args parsing */
 254     str_init_strings (NULL);
 255
 256     if (!mc_args_parse (&argc, &argv, "mc", &error))
 257     {
 258       startup_exit_falure:
 259         fprintf (stderr, _("Failed to run:\n%s\n"), error->message);
 260         g_error_free (error);
 261         g_free (mc_global.tty.shell);
 262       startup_exit_ok:
 263         str_uninit_strings ();
 264         return exit_code;
 265     }
 266
 267     /* do this before mc_args_show_info () to view paths in the --datadir-info output */
 268     OS_Setup ();
 269
 270     if (!g_path_is_absolute (mc_config_get_home_dir ()))
 271     {
 272         error = g_error_new (MC_ERROR, 0, "%s: %s", _("Home directory path is not absolute"),
 273                              mc_config_get_home_dir ());
 274         mc_event_deinit (NULL);
 275         goto startup_exit_falure;
 276     }
 277
 278     if (!mc_args_show_info ())
 279     {
 280         exit_code = EXIT_SUCCESS;
 281         goto startup_exit_ok;
 282     }
 283
 284     if (!events_init (&error))
 285         goto startup_exit_falure;
 286
 287     mc_config_init_config_paths (&error);
 288     if (error == NULL)
 289         config_migrated = mc_config_migrate_from_old_place (&error, &config_migrate_msg);
 290     if (error != NULL)
 291     {
 292         mc_event_deinit (NULL);
 293         goto startup_exit_falure;
 294     }
 295
 296     vfs_init ();
 297     vfs_plugins_init ();
 298     vfs_setup_work_dir ();
 299
 300     /* do this after vfs initialization due to mc_setctl() call in mc_setup_by_args() */
 301     if (!mc_setup_by_args (argc, argv, &error))
 302     {
 303         vfs_shut ();
 304         mc_event_deinit (NULL);
 305         goto startup_exit_falure;
 306     }
 307
 308     /* check terminal type
 309      * $TEMR must be set and not empty
 310      * mc_global.tty.xterm_flag is used in init_key() and tty_init()
 311      * Do this after mc_args_handle() where mc_args__force_xterm is set up.
 312      */
 313     mc_global.tty.xterm_flag = tty_check_term (mc_args__force_xterm);
 314
 315     /* NOTE: This has to be called before tty_init or whatever routine
 316        calls any define_sequence */
 317     init_key ();
 318
 319     /* Must be done before installing the SIGCHLD handler [[FIXME]] */
 320     handle_console (CONSOLE_INIT);
 321
 322 #ifdef ENABLE_SUBSHELL
 323     /* Don't use subshell when invoked as viewer or editor */
 324     if (mc_global.mc_run_mode != MC_RUN_FULL)
 325         mc_global.tty.use_subshell = FALSE;
 326
 327     if (mc_global.tty.use_subshell)
 328         subshell_get_console_attributes ();
 329 #endif /* ENABLE_SUBSHELL */
 330
 331     /* Install the SIGCHLD handler; must be done before init_subshell() */
 332     init_sigchld ();
 333
 334     /* We need this, since ncurses endwin () doesn't restore the signals */
 335     save_stop_handler ();
 336
 337     /* Must be done before init_subshell, to set up the terminal size: */
 338     /* FIXME: Should be removed and LINES and COLS computed on subshell */
 339     tty_init (!mc_args__nomouse, mc_global.tty.xterm_flag);
 340
 341     load_setup ();
 342
 343     /* start check mc_global.display_codepage and mc_global.source_codepage */
 344     check_codeset ();
 345
 346     /* Removing this from the X code let's us type C-c */
 347     load_key_defs ();
 348
 349     load_keymap_defs (!mc_args__nokeymap);
 350
 351     macros_list = g_array_new (TRUE, FALSE, sizeof (macros_t));
 352
 353     tty_init_colors (mc_global.tty.disable_colors, mc_args__force_colors);
 354
 355     mc_skin_init (&error);
 356     if (error != NULL)
 357     {
 358         message (D_ERROR, _("Warning"), "%s", error->message);
 359         g_error_free (error);
 360         error = NULL;
 361     }
 362
 363     dlg_set_default_colors ();
 364
 365 #ifdef ENABLE_SUBSHELL
 366     /* Done here to ensure that the subshell doesn't  */
 367     /* inherit the file descriptors opened below, etc */
 368     if (mc_global.tty.use_subshell)
 369         init_subshell ();
 370
 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     /* subshell_prompt is NULL here */
 381     mc_prompt = (geteuid () == 0) ? "# " : "$ ";
 382
 383     if (config_migrated)
 384     {
 385         message (D_ERROR, _("Warning"), "%s", config_migrate_msg);
 386         g_free (config_migrate_msg);
 387     }
 388
 389     /* Program main loop */
 390     if (mc_global.midnight_shutdown)
 391         exit_code = EXIT_SUCCESS;
 392     else
 393         exit_code = do_nc ()? EXIT_SUCCESS : EXIT_FAILURE;
 394
 395     /* Save the tree store */
 396     (void) tree_store_save ();
 397
 398     free_keymap_defs ();
 399
 400     /* Virtual File System shutdown */
 401     vfs_shut ();
 402
 403     flush_extension_file ();    /* does only free memory */
 404
 405     mc_skin_deinit ();
 406     tty_colors_done ();
 407
 408     tty_shutdown ();
 409
 410     done_setup ();
 411
 412     if (mc_global.tty.console_flag != '\0' && (quit & SUBSHELL_EXIT) == 0)
 413         handle_console (CONSOLE_RESTORE);
 414     if (mc_global.tty.alternate_plus_minus)
 415         numeric_keypad_mode ();
 416
 417     (void) signal (SIGCHLD, SIG_DFL);   /* Disable the SIGCHLD handler */
 418
 419     if (mc_global.tty.console_flag != '\0')
 420         handle_console (CONSOLE_DONE);
 421
 422     if (mc_global.mc_run_mode == MC_RUN_FULL && mc_args__last_wd_file != NULL
 423         && last_wd_string != NULL && !print_last_revert)
 424     {
 425         int last_wd_fd;
 426
 427         last_wd_fd = open (mc_args__last_wd_file, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL,
 428                            S_IRUSR | S_IWUSR);
 429         if (last_wd_fd != -1)
 430         {
 431             ssize_t ret1;
 432             int ret2;
 433             ret1 = write (last_wd_fd, last_wd_string, strlen (last_wd_string));
 434             ret2 = close (last_wd_fd);
 435             (void) ret1;
 436             (void) ret2;
 437         }
 438     }
 439     g_free (last_wd_string);
 440
 441     g_free (mc_global.tty.shell);
 442
 443     done_key ();
 444
 445     if (macros_list != NULL)
 446     {
 447         guint i;
 448         macros_t *macros;
 449         for (i = 0; i < macros_list->len; i++)
 450         {
 451             macros = &g_array_index (macros_list, struct macros_t, i);
 452             if (macros != NULL && macros->macro != NULL)
 453                 (void) g_array_free (macros->macro, FALSE);
 454         }
 455         (void) g_array_free (macros_list, TRUE);
 456     }
 457
 458     str_uninit_strings ();
 459
 460     if (mc_global.mc_run_mode != MC_RUN_EDITOR)
 461         g_free (mc_run_param0);
 462     else
 463     {
 464         g_list_foreach ((GList *) mc_run_param0, (GFunc) mcedit_arg_free, NULL);
 465         g_list_free ((GList *) mc_run_param0);
 466     }
 467     g_free (mc_run_param1);
 468
 469     mc_config_deinit_config_paths ();
 470
 471     (void) mc_event_deinit (&error);
 472     if (error != NULL)
 473     {
 474         fprintf (stderr, _("\nFailed while close:\n%s\n"), error->message);
 475         g_error_free (error);
 476         exit_code = EXIT_FAILURE;
 477     }
 478
 479     (void) putchar ('\n');      /* Hack to make shell's prompt start at left of screen */
 480
 481     return exit_code;
 482 }
 483
 484 /* --------------------------------------------------------------------------------------------- */