src/main.c

   1 /*
   2    Main program for the Midnight Commander
   3
   4    Copyright (C) 1994-2015
   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.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
 158 /* --------------------------------------------------------------------------------------------- */
 159
 160 static void
 161 sigchld_handler_no_subshell (int sig)
 162 {
 163 #ifdef __linux__
 164     int pid, status;
 165
 166     if (mc_global.tty.console_flag == '\0')
 167         return;
 168
 169     /* COMMENT: if it were true that after the call to handle_console(..INIT)
 170        the value of mc_global.tty.console_flag never changed, we could simply not install
 171        this handler at all if (!mc_global.tty.console_flag && !mc_global.tty.use_subshell). */
 172
 173     /* That comment is no longer true.  We need to wait() on a sigchld
 174        handler (that's at least what the tarfs code expects currently). */
 175
 176     pid = waitpid (cons_saver_pid, &status, WUNTRACED | WNOHANG);
 177
 178     if (pid == cons_saver_pid)
 179     {
 180         if (WIFSTOPPED (status))
 181         {
 182             /* Someone has stopped cons.saver - restart it */
 183             kill (pid, SIGCONT);
 184         }
 185         else
 186         {
 187             /* cons.saver has died - disable console saving */
 188             handle_console (CONSOLE_DONE);
 189             mc_global.tty.console_flag = '\0';
 190         }
 191     }
 192     /* If we got here, some other child exited; ignore it */
 193 #endif /* __linux__ */
 194
 195     (void) sig;
 196 }
 197
 198 /* --------------------------------------------------------------------------------------------- */
 199
 200 static void
 201 init_sigchld (void)
 202 {
 203     struct sigaction sigchld_action;
 204
 205     memset (&sigchld_action, 0, sizeof (sigchld_action));
 206     sigchld_action.sa_handler =
 207 #ifdef ENABLE_SUBSHELL
 208         mc_global.tty.use_subshell ? sigchld_handler :
 209 #endif /* ENABLE_SUBSHELL */
 210         sigchld_handler_no_subshell;
 211
 212     sigemptyset (&sigchld_action.sa_mask);
 213
 214 #ifdef SA_RESTART
 215     sigchld_action.sa_flags = SA_RESTART;
 216 #endif /* !SA_RESTART */
 217
 218     if (sigaction (SIGCHLD, &sigchld_action, NULL) == -1)
 219     {
 220 #ifdef ENABLE_SUBSHELL
 221         /*
 222          * This may happen on QNX Neutrino 6, where SA_RESTART
 223          * is defined but not implemented.  Fallback to no subshell.
 224          */
 225         mc_global.tty.use_subshell = FALSE;
 226 #endif /* ENABLE_SUBSHELL */
 227     }
 228 }
 229
 230 /* --------------------------------------------------------------------------------------------- */
 231 /*** public functions ****************************************************************************/
 232 /* --------------------------------------------------------------------------------------------- */
 233
 234 int
 235 main (int argc, char *argv[])
 236 {
 237     GError *mcerror = NULL;
 238     gboolean config_migrated = FALSE;
 239     char *config_migrate_msg;
 240     int exit_code = EXIT_FAILURE;
 241
 242     mc_global.timer = mc_timer_new ();
 243
 244     /* We had LC_CTYPE before, LC_ALL includs LC_TYPE as well */
 245 #ifdef HAVE_SETLOCALE
 246     (void) setlocale (LC_ALL, "");
 247 #endif
 248     (void) bindtextdomain (PACKAGE, LOCALEDIR);
 249     (void) textdomain (PACKAGE);
 250
 251     /* do this before args parsing */
 252     str_init_strings (NULL);
 253
 254     if (!mc_args_parse (&argc, &argv, "mc", &mcerror))
 255     {
 256       startup_exit_falure:
 257         fprintf (stderr, _("Failed to run:\n%s\n"), mcerror->message);
 258         g_error_free (mcerror);
 259         g_free (mc_global.tty.shell);
 260       startup_exit_ok:
 261         str_uninit_strings ();
 262         mc_timer_destroy (mc_global.timer);
 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         mc_propagate_error (&mcerror, 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 (&mcerror))
 284         goto startup_exit_falure;
 285
 286     mc_config_init_config_paths (&mcerror);
 287     config_migrated = mc_config_migrate_from_old_place (&mcerror, &config_migrate_msg);
 288     if (mcerror != NULL)
 289     {
 290         mc_event_deinit (NULL);
 291         goto startup_exit_falure;
 292     }
 293
 294     vfs_init ();
 295     vfs_plugins_init ();
 296
 297     load_setup ();
 298
 299     /* Must be done after load_setup because depends on mc_global.vfs.cd_symlinks */
 300     vfs_setup_work_dir ();
 301
 302     /* Resolve the other_dir panel option. Must be done after vfs_setup_work_dir */
 303     {
 304         char *buffer;
 305         vfs_path_t *vpath;
 306
 307         buffer = mc_config_get_string (mc_panels_config, "Dirs", "other_dir", ".");
 308         vpath = vfs_path_from_str (buffer);
 309         if (vfs_file_is_local (vpath))
 310             saved_other_dir = buffer;
 311         else
 312             g_free (buffer);
 313         vfs_path_free (vpath);
 314     }
 315
 316     /* Set up temporary directory after VFS initialization */
 317     mc_tmpdir ();
 318
 319     /* do this after vfs initialization and vfs working directory setup
 320        due to mc_setctl() and mcedit_arg_vpath_new() calls in mc_setup_by_args() */
 321     if (!mc_setup_by_args (argc, argv, &mcerror))
 322     {
 323         vfs_shut ();
 324         done_setup ();
 325         g_free (saved_other_dir);
 326         mc_event_deinit (NULL);
 327         goto startup_exit_falure;
 328     }
 329
 330     /* check terminal type
 331      * $TEMR must be set and not empty
 332      * mc_global.tty.xterm_flag is used in init_key() and tty_init()
 333      * Do this after mc_args_handle() where mc_args__force_xterm is set up.
 334      */
 335     mc_global.tty.xterm_flag = tty_check_term (mc_args__force_xterm);
 336
 337     /* NOTE: This has to be called before tty_init or whatever routine
 338        calls any define_sequence */
 339     init_key ();
 340
 341     /* Must be done before installing the SIGCHLD handler [[FIXME]] */
 342     handle_console (CONSOLE_INIT);
 343
 344 #ifdef ENABLE_SUBSHELL
 345     /* Don't use subshell when invoked as viewer or editor */
 346     if (mc_global.mc_run_mode != MC_RUN_FULL)
 347         mc_global.tty.use_subshell = FALSE;
 348
 349     if (mc_global.tty.use_subshell)
 350         subshell_get_console_attributes ();
 351 #endif /* ENABLE_SUBSHELL */
 352
 353     /* Install the SIGCHLD handler; must be done before init_subshell() */
 354     init_sigchld ();
 355
 356     /* We need this, since ncurses endwin () doesn't restore the signals */
 357     save_stop_handler ();
 358
 359     /* Must be done before init_subshell, to set up the terminal size: */
 360     /* FIXME: Should be removed and LINES and COLS computed on subshell */
 361     tty_init (!mc_args__nomouse, mc_global.tty.xterm_flag);
 362
 363     /* start check mc_global.display_codepage and mc_global.source_codepage */
 364     check_codeset ();
 365
 366     /* Removing this from the X code let's us type C-c */
 367     load_key_defs ();
 368
 369     load_keymap_defs (!mc_args__nokeymap);
 370
 371     macros_list = g_array_new (TRUE, FALSE, sizeof (macros_t));
 372
 373     tty_init_colors (mc_global.tty.disable_colors, mc_args__force_colors);
 374
 375     mc_skin_init (NULL, &mcerror);
 376     dlg_set_default_colors ();
 377     input_set_default_colors ();
 378     if (mc_global.mc_run_mode == MC_RUN_FULL)
 379         command_set_default_colors ();
 380
 381     mc_error_message (&mcerror, NULL);
 382
 383 #ifdef ENABLE_SUBSHELL
 384     /* Done here to ensure that the subshell doesn't  */
 385     /* inherit the file descriptors opened below, etc */
 386     if (mc_global.tty.use_subshell)
 387         init_subshell ();
 388 #endif /* ENABLE_SUBSHELL */
 389
 390     /* Also done after init_subshell, to save any shell init file messages */
 391     if (mc_global.tty.console_flag != '\0')
 392         handle_console (CONSOLE_SAVE);
 393
 394     if (mc_global.tty.alternate_plus_minus)
 395         application_keypad_mode ();
 396
 397     /* Done after subshell initialization to allow select and paste text by mouse
 398        w/o Shift button in subshell in the native console */
 399     init_mouse ();
 400
 401     /* Done after do_enter_ca_mode (tty_init) because in VTE bracketed mode is
 402        separate for the normal and alternate screens */
 403     enable_bracketed_paste ();
 404
 405     /* subshell_prompt is NULL here */
 406     mc_prompt = (geteuid () == 0) ? "# " : "$ ";
 407
 408     if (config_migrated)
 409     {
 410         message (D_ERROR, _("Warning"), "%s", config_migrate_msg);
 411         g_free (config_migrate_msg);
 412     }
 413
 414     /* Program main loop */
 415     if (mc_global.midnight_shutdown)
 416         exit_code = EXIT_SUCCESS;
 417     else
 418         exit_code = do_nc ()? EXIT_SUCCESS : EXIT_FAILURE;
 419
 420     /* Save the tree store */
 421     (void) tree_store_save ();
 422
 423     free_keymap_defs ();
 424
 425     /* Virtual File System shutdown */
 426     vfs_shut ();
 427
 428     flush_extension_file ();    /* does only free memory */
 429
 430     mc_skin_deinit ();
 431     tty_colors_done ();
 432
 433     tty_shutdown ();
 434
 435     done_setup ();
 436
 437     if (mc_global.tty.console_flag != '\0' && (quit & SUBSHELL_EXIT) == 0)
 438         handle_console (CONSOLE_RESTORE);
 439     if (mc_global.tty.alternate_plus_minus)
 440         numeric_keypad_mode ();
 441
 442     (void) signal (SIGCHLD, SIG_DFL);   /* Disable the SIGCHLD handler */
 443
 444     if (mc_global.tty.console_flag != '\0')
 445         handle_console (CONSOLE_DONE);
 446
 447     if (mc_global.mc_run_mode == MC_RUN_FULL && mc_args__last_wd_file != NULL
 448         && last_wd_string != NULL && !print_last_revert)
 449     {
 450         int last_wd_fd;
 451
 452         last_wd_fd = open (mc_args__last_wd_file, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL,
 453                            S_IRUSR | S_IWUSR);
 454         if (last_wd_fd != -1)
 455         {
 456             ssize_t ret1;
 457             int ret2;
 458             ret1 = write (last_wd_fd, last_wd_string, strlen (last_wd_string));
 459             ret2 = close (last_wd_fd);
 460             (void) ret1;
 461             (void) ret2;
 462         }
 463     }
 464     g_free (last_wd_string);
 465
 466     g_free (mc_global.tty.shell);
 467
 468     done_key ();
 469
 470     if (macros_list != NULL)
 471     {
 472         guint i;
 473         for (i = 0; i < macros_list->len; i++)
 474         {
 475             macros_t *macros;
 476
 477             macros = &g_array_index (macros_list, struct macros_t, i);
 478             if (macros != NULL && macros->macro != NULL)
 479                 (void) g_array_free (macros->macro, FALSE);
 480         }
 481         (void) g_array_free (macros_list, TRUE);
 482     }
 483
 484     str_uninit_strings ();
 485
 486     if (mc_global.mc_run_mode != MC_RUN_EDITOR)
 487         g_free (mc_run_param0);
 488     else
 489         g_list_free_full ((GList *) mc_run_param0, (GDestroyNotify) mcedit_arg_free);
 490
 491     g_free (mc_run_param1);
 492     g_free (saved_other_dir);
 493
 494     mc_config_deinit_config_paths ();
 495
 496     (void) mc_event_deinit (&mcerror);
 497     if (mcerror != NULL)
 498     {
 499         fprintf (stderr, _("\nFailed while close:\n%s\n"), mcerror->message);
 500         g_error_free (mcerror);
 501         exit_code = EXIT_FAILURE;
 502     }
 503
 504     mc_timer_destroy (mc_global.timer);
 505
 506     (void) putchar ('\n');      /* Hack to make shell's prompt start at left of screen */
 507
 508     return exit_code;
 509 }
 510
 511 /* --------------------------------------------------------------------------------------------- */