src/main.c

   1 /*
   2    Main program for the Midnight Commander
   3
   4    Copyright (C) 1994-2016
   5    Free Software Foundation, Inc.
   6
   7    Written by:
   8    Miguel de Icaza, 1994, 1995, 1996, 1997
   9    Janne Kukonlehto, 1994, 1995
  10    Norbert Warmuth, 1997
  11
  12    This file is part of the Midnight Commander.
  13
  14    The Midnight Commander is free software: you can redistribute it
  15    and/or modify it under the terms of the GNU General Public License as
  16    published by the Free Software Foundation, either version 3 of the License,
  17    or (at your option) any later version.
  18
  19    The Midnight Commander is distributed in the hope that it will be useful,
  20    but WITHOUT ANY WARRANTY; without even the implied warranty of
  21    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22    GNU General Public License for more details.
  23
  24    You should have received a copy of the GNU General Public License
  25    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  26  */
  27
  28 /** \file main.c
  29  *  \brief Source: this is a main module
  30  */
  31
  32 #include <config.h>
  33
  34 #include <ctype.h>
  35 #include <errno.h>
  36 #include <locale.h>
  37 #include <pwd.h>                /* for username in xterm title */
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <sys/wait.h>
  42 #include <signal.h>
  43
  44 #include "lib/global.h"
  45
  46 #include "lib/event.h"
  47 #include "lib/tty/tty.h"
  48 #include "lib/tty/key.h"        /* For init_key() */
  49 #include "lib/tty/mouse.h"      /* init_mouse() */
  50 #include "lib/timer.h"
  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/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_global.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 /** POSIX version.  The only version we support.  */
 122
 123 static void
 124 OS_Setup (void)
 125 {
 126     const char *datadir_env;
 127
 128     mc_shell_init ();
 129
 130     /* This is the directory, where MC was installed, on Unix this is DATADIR */
 131     /* and can be overriden by the MC_DATADIR environment variable */
 132     datadir_env = g_getenv ("MC_DATADIR");
 133     if (datadir_env != NULL)
 134         mc_global.sysconfig_dir = g_strdup (datadir_env);
 135     else
 136         mc_global.sysconfig_dir = g_strdup (SYSCONFDIR);
 137
 138     mc_global.share_data_dir = g_strdup (DATADIR);
 139 }
 140
 141 /* --------------------------------------------------------------------------------------------- */
 142
 143 static void
 144 sigchld_handler_no_subshell (int sig)
 145 {
 146 #ifdef __linux__
 147     int pid, status;
 148
 149     if (mc_global.tty.console_flag == '\0')
 150         return;
 151
 152     /* COMMENT: if it were true that after the call to handle_console(..INIT)
 153        the value of mc_global.tty.console_flag never changed, we could simply not install
 154        this handler at all if (!mc_global.tty.console_flag && !mc_global.tty.use_subshell). */
 155
 156     /* That comment is no longer true.  We need to wait() on a sigchld
 157        handler (that's at least what the tarfs code expects currently). */
 158
 159     pid = waitpid (cons_saver_pid, &status, WUNTRACED | WNOHANG);
 160
 161     if (pid == cons_saver_pid)
 162     {
 163         if (WIFSTOPPED (status))
 164         {
 165             /* Someone has stopped cons.saver - restart it */
 166             kill (pid, SIGCONT);
 167         }
 168         else
 169         {
 170             /* cons.saver has died - disable console saving */
 171             handle_console (CONSOLE_DONE);
 172             mc_global.tty.console_flag = '\0';
 173         }
 174     }
 175     /* If we got here, some other child exited; ignore it */
 176 #endif /* __linux__ */
 177
 178     (void) sig;
 179 }
 180
 181 /* --------------------------------------------------------------------------------------------- */
 182
 183 static void
 184 init_sigchld (void)
 185 {
 186     struct sigaction sigchld_action;
 187
 188     memset (&sigchld_action, 0, sizeof (sigchld_action));
 189     sigchld_action.sa_handler =
 190 #ifdef ENABLE_SUBSHELL
 191         mc_global.tty.use_subshell ? sigchld_handler :
 192 #endif /* ENABLE_SUBSHELL */
 193         sigchld_handler_no_subshell;
 194
 195     sigemptyset (&sigchld_action.sa_mask);
 196
 197 #ifdef SA_RESTART
 198     sigchld_action.sa_flags = SA_RESTART;
 199 #endif /* !SA_RESTART */
 200
 201     if (sigaction (SIGCHLD, &sigchld_action, NULL) == -1)
 202     {
 203 #ifdef ENABLE_SUBSHELL
 204         /*
 205          * This may happen on QNX Neutrino 6, where SA_RESTART
 206          * is defined but not implemented.  Fallback to no subshell.
 207          */
 208         mc_global.tty.use_subshell = FALSE;
 209 #endif /* ENABLE_SUBSHELL */
 210     }
 211 }
 212
 213 /* --------------------------------------------------------------------------------------------- */
 214 /*** public functions ****************************************************************************/
 215 /* --------------------------------------------------------------------------------------------- */
 216
 217 int
 218 main (int argc, char *argv[])
 219 {
 220     GError *mcerror = NULL;
 221     gboolean config_migrated = FALSE;
 222     char *config_migrate_msg;
 223     int exit_code = EXIT_FAILURE;
 224
 225     mc_global.timer = mc_timer_new ();
 226
 227     /* We had LC_CTYPE before, LC_ALL includs LC_TYPE as well */
 228 #ifdef HAVE_SETLOCALE
 229     (void) setlocale (LC_ALL, "");
 230 #endif
 231     (void) bindtextdomain (PACKAGE, LOCALEDIR);
 232     (void) textdomain (PACKAGE);
 233
 234     /* do this before args parsing */
 235     str_init_strings (NULL);
 236
 237     if (!mc_args_parse (&argc, &argv, "mc", &mcerror))
 238     {
 239       startup_exit_falure:
 240         fprintf (stderr, _("Failed to run:\n%s\n"), mcerror->message);
 241         g_error_free (mcerror);
 242       startup_exit_ok:
 243         mc_shell_deinit ();
 244         str_uninit_strings ();
 245         mc_timer_destroy (mc_global.timer);
 246         return exit_code;
 247     }
 248
 249     /* do this before mc_args_show_info () to view paths in the --datadir-info output */
 250     OS_Setup ();
 251
 252     if (!g_path_is_absolute (mc_config_get_home_dir ()))
 253     {
 254         mc_propagate_error (&mcerror, 0, "%s: %s", _("Home directory path is not absolute"),
 255                             mc_config_get_home_dir ());
 256         mc_event_deinit (NULL);
 257         goto startup_exit_falure;
 258     }
 259
 260     if (!mc_args_show_info ())
 261     {
 262         exit_code = EXIT_SUCCESS;
 263         goto startup_exit_ok;
 264     }
 265
 266     if (!events_init (&mcerror))
 267         goto startup_exit_falure;
 268
 269     mc_config_init_config_paths (&mcerror);
 270     config_migrated = mc_config_migrate_from_old_place (&mcerror, &config_migrate_msg);
 271     if (mcerror != NULL)
 272     {
 273         mc_event_deinit (NULL);
 274         goto startup_exit_falure;
 275     }
 276
 277     vfs_init ();
 278     vfs_plugins_init ();
 279
 280     load_setup ();
 281
 282     /* Must be done after load_setup because depends on mc_global.vfs.cd_symlinks */
 283     vfs_setup_work_dir ();
 284
 285     /* Resolve the other_dir panel option. Must be done after vfs_setup_work_dir */
 286     {
 287         char *buffer;
 288         vfs_path_t *vpath;
 289
 290         buffer = mc_config_get_string (mc_global.panels_config, "Dirs", "other_dir", ".");
 291         vpath = vfs_path_from_str (buffer);
 292         if (vfs_file_is_local (vpath))
 293             saved_other_dir = buffer;
 294         else
 295             g_free (buffer);
 296         vfs_path_free (vpath);
 297     }
 298
 299     /* Set up temporary directory after VFS initialization */
 300     mc_tmpdir ();
 301
 302     /* do this after vfs initialization and vfs working directory setup
 303        due to mc_setctl() and mcedit_arg_vpath_new() calls in mc_setup_by_args() */
 304     if (!mc_setup_by_args (argc, argv, &mcerror))
 305     {
 306         vfs_shut ();
 307         done_setup ();
 308         g_free (saved_other_dir);
 309         mc_event_deinit (NULL);
 310         goto startup_exit_falure;
 311     }
 312
 313     /* check terminal type
 314      * $TEMR must be set and not empty
 315      * mc_global.tty.xterm_flag is used in init_key() and tty_init()
 316      * Do this after mc_args_handle() where mc_args__force_xterm is set up.
 317      */
 318     mc_global.tty.xterm_flag = tty_check_term (mc_args__force_xterm);
 319
 320     /* NOTE: This has to be called before tty_init or whatever routine
 321        calls any define_sequence */
 322     init_key ();
 323
 324     /* Must be done before installing the SIGCHLD handler [[FIXME]] */
 325     handle_console (CONSOLE_INIT);
 326
 327 #ifdef ENABLE_SUBSHELL
 328     /* Don't use subshell when invoked as viewer or editor */
 329     if (mc_global.mc_run_mode != MC_RUN_FULL)
 330         mc_global.tty.use_subshell = FALSE;
 331
 332     if (mc_global.tty.use_subshell)
 333         subshell_get_console_attributes ();
 334 #endif /* ENABLE_SUBSHELL */
 335
 336     /* Install the SIGCHLD handler; must be done before init_subshell() */
 337     init_sigchld ();
 338
 339     /* We need this, since ncurses endwin () doesn't restore the signals */
 340     save_stop_handler ();
 341
 342     /* Must be done before init_subshell, to set up the terminal size: */
 343     /* FIXME: Should be removed and LINES and COLS computed on subshell */
 344     tty_init (!mc_args__nomouse, mc_global.tty.xterm_flag);
 345
 346     /* start check mc_global.display_codepage and mc_global.source_codepage */
 347     check_codeset ();
 348
 349     /* Removing this from the X code let's us type C-c */
 350     load_key_defs ();
 351
 352     load_keymap_defs (!mc_args__nokeymap);
 353
 354 #ifdef USE_INTERNAL_EDIT
 355     macros_list = g_array_new (TRUE, FALSE, sizeof (macros_t));
 356 #endif /* USE_INTERNAL_EDIT */
 357
 358     tty_init_colors (mc_global.tty.disable_colors, mc_args__force_colors);
 359
 360     mc_skin_init (NULL, &mcerror);
 361     dlg_set_default_colors ();
 362     input_set_default_colors ();
 363     if (mc_global.mc_run_mode == MC_RUN_FULL)
 364         command_set_default_colors ();
 365
 366     mc_error_message (&mcerror, NULL);
 367
 368 #ifdef ENABLE_SUBSHELL
 369     /* Done here to ensure that the subshell doesn't  */
 370     /* inherit the file descriptors opened below, etc */
 371     if (mc_global.tty.use_subshell)
 372         init_subshell ();
 373 #endif /* ENABLE_SUBSHELL */
 374
 375     /* Also done after init_subshell, to save any shell init file messages */
 376     if (mc_global.tty.console_flag != '\0')
 377         handle_console (CONSOLE_SAVE);
 378
 379     if (mc_global.tty.alternate_plus_minus)
 380         application_keypad_mode ();
 381
 382     /* Done after subshell initialization to allow select and paste text by mouse
 383        w/o Shift button in subshell in the native console */
 384     init_mouse ();
 385
 386     /* Done after tty_enter_ca_mode (tty_init) because in VTE bracketed mode is
 387        separate for the normal and alternate screens */
 388     enable_bracketed_paste ();
 389
 390     /* subshell_prompt is NULL here */
 391     mc_prompt = (geteuid () == 0) ? "# " : "$ ";
 392
 393     if (config_migrated)
 394     {
 395         message (D_ERROR, _("Warning"), "%s", config_migrate_msg);
 396         g_free (config_migrate_msg);
 397     }
 398
 399     /* Program main loop */
 400     if (mc_global.midnight_shutdown)
 401         exit_code = EXIT_SUCCESS;
 402     else
 403         exit_code = do_nc ()? EXIT_SUCCESS : EXIT_FAILURE;
 404
 405     /* Save the tree store */
 406     (void) tree_store_save ();
 407
 408     free_keymap_defs ();
 409
 410     /* Virtual File System shutdown */
 411     vfs_shut ();
 412
 413     flush_extension_file ();    /* does only free memory */
 414
 415     mc_skin_deinit ();
 416     tty_colors_done ();
 417
 418     tty_shutdown ();
 419
 420     done_setup ();
 421
 422     if (mc_global.tty.console_flag != '\0' && (quit & SUBSHELL_EXIT) == 0)
 423         handle_console (CONSOLE_RESTORE);
 424     if (mc_global.tty.alternate_plus_minus)
 425         numeric_keypad_mode ();
 426
 427     (void) signal (SIGCHLD, SIG_DFL);   /* Disable the SIGCHLD handler */
 428
 429     if (mc_global.tty.console_flag != '\0')
 430         handle_console (CONSOLE_DONE);
 431
 432     if (mc_global.mc_run_mode == MC_RUN_FULL && mc_args__last_wd_file != NULL
 433         && last_wd_string != NULL && !print_last_revert)
 434     {
 435         int last_wd_fd;
 436
 437         last_wd_fd = open (mc_args__last_wd_file, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL,
 438                            S_IRUSR | S_IWUSR);
 439         if (last_wd_fd != -1)
 440         {
 441             ssize_t ret1;
 442             int ret2;
 443             ret1 = write (last_wd_fd, last_wd_string, strlen (last_wd_string));
 444             ret2 = close (last_wd_fd);
 445             (void) ret1;
 446             (void) ret2;
 447         }
 448     }
 449     g_free (last_wd_string);
 450
 451     mc_shell_deinit ();
 452
 453     done_key ();
 454
 455 #ifdef USE_INTERNAL_EDIT
 456     if (macros_list != NULL)
 457     {
 458         guint i;
 459
 460         for (i = 0; i < macros_list->len; i++)
 461         {
 462             macros_t *macros;
 463
 464             macros = &g_array_index (macros_list, struct macros_t, i);
 465             if (macros != NULL && macros->macro != NULL)
 466                 (void) g_array_free (macros->macro, TRUE);
 467         }
 468         (void) g_array_free (macros_list, TRUE);
 469     }
 470 #endif /* USE_INTERNAL_EDIT */
 471
 472     str_uninit_strings ();
 473
 474     if (mc_global.mc_run_mode != MC_RUN_EDITOR)
 475         g_free (mc_run_param0);
 476     else
 477         g_list_free_full ((GList *) mc_run_param0, (GDestroyNotify) mcedit_arg_free);
 478
 479     g_free (mc_run_param1);
 480     g_free (saved_other_dir);
 481
 482     mc_config_deinit_config_paths ();
 483
 484     (void) mc_event_deinit (&mcerror);
 485     if (mcerror != NULL)
 486     {
 487         fprintf (stderr, _("\nFailed while close:\n%s\n"), mcerror->message);
 488         g_error_free (mcerror);
 489         exit_code = EXIT_FAILURE;
 490     }
 491
 492     mc_timer_destroy (mc_global.timer);
 493
 494     (void) putchar ('\n');      /* Hack to make shell's prompt start at left of screen */
 495
 496     return exit_code;
 497 }
 498
 499 /* --------------------------------------------------------------------------------------------- */