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 #include "subshell.h"
  69 #include "setup.h"              /* load_setup() */
  70
  71 #ifdef HAVE_CHARSET
  72 #include "lib/charsets.h"
  73 #include "selcodepage.h"
  74 #endif /* HAVE_CHARSET */
  75
  76 #include "consaver/cons.saver.h"        /* cons_saver_pid */
  77
  78 /*** global variables ****************************************************************************/
  79
  80 /*** file scope macro definitions ****************************************************************/
  81
  82 /*** file scope type declarations ****************************************************************/
  83
  84 /*** file scope variables ************************************************************************/
  85
  86 /*** file scope functions ************************************************************************/
  87 /* --------------------------------------------------------------------------------------------- */
  88
  89 static void
  90 check_codeset (void)
  91 {
  92     const char *current_system_codepage = NULL;
  93
  94     current_system_codepage = str_detect_termencoding ();
  95
  96 #ifdef HAVE_CHARSET
  97     {
  98         const char *_display_codepage;
  99
 100         _display_codepage = get_codepage_id (mc_global.display_codepage);
 101
 102         if (strcmp (_display_codepage, current_system_codepage) != 0)
 103         {
 104             mc_global.display_codepage = get_codepage_index (current_system_codepage);
 105             if (mc_global.display_codepage == -1)
 106                 mc_global.display_codepage = 0;
 107
 108             mc_config_set_string (mc_main_config, CONFIG_MISC_SECTION, "display_codepage",
 109                                   cp_display);
 110         }
 111     }
 112 #endif
 113
 114     mc_global.utf8_display = str_isutf8 (current_system_codepage);
 115 }
 116
 117 /* --------------------------------------------------------------------------------------------- */
 118
 119 /** POSIX version.  The only version we support.  */
 120 static void
 121 OS_Setup (void)
 122 {
 123     const char *shell_env;
 124     const char *datadir_env;
 125
 126     shell_env = getenv ("SHELL");
 127     if ((shell_env == NULL) || (shell_env[0] == '\0'))
 128     {
 129         struct passwd *pwd;
 130         pwd = getpwuid (geteuid ());
 131         if (pwd != NULL)
 132             shell = g_strdup (pwd->pw_shell);
 133     }
 134     else
 135         shell = g_strdup (shell_env);
 136
 137     if ((shell == NULL) || (shell[0] == '\0'))
 138     {
 139         g_free (shell);
 140         shell = g_strdup ("/bin/sh");
 141     }
 142
 143     /* This is the directory, where MC was installed, on Unix this is DATADIR */
 144     /* and can be overriden by the MC_DATADIR environment variable */
 145     datadir_env = g_getenv ("MC_DATADIR");
 146     if (datadir_env != NULL)
 147         mc_global.sysconfig_dir = g_strdup (datadir_env);
 148     else
 149         mc_global.sysconfig_dir = g_strdup (SYSCONFDIR);
 150
 151     mc_global.share_data_dir = g_strdup (DATADIR);
 152
 153     /* Set up temporary directory */
 154     mc_tmpdir ();
 155 }
 156
 157 /* --------------------------------------------------------------------------------------------- */
 158
 159 static void
 160 sigchld_handler_no_subshell (int sig)
 161 {
 162 #ifdef __linux__
 163     int pid, status;
 164
 165     if (!mc_global.tty.console_flag != '\0')
 166         return;
 167
 168     /* COMMENT: if it were true that after the call to handle_console(..INIT)
 169        the value of mc_global.tty.console_flag never changed, we could simply not install
 170        this handler at all if (!mc_global.tty.console_flag && !mc_global.tty.use_subshell). */
 171
 172     /* That comment is no longer true.  We need to wait() on a sigchld
 173        handler (that's at least what the tarfs code expects currently). */
 174
 175     pid = waitpid (cons_saver_pid, &status, WUNTRACED | WNOHANG);
 176
 177     if (pid == cons_saver_pid)
 178     {
 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     sigchld_action.sa_handler =
 206 #ifdef HAVE_SUBSHELL_SUPPORT
 207         mc_global.tty.use_subshell ? sigchld_handler :
 208 #endif /* HAVE_SUBSHELL_SUPPORT */
 209         sigchld_handler_no_subshell;
 210
 211     sigemptyset (&sigchld_action.sa_mask);
 212
 213 #ifdef SA_RESTART
 214     sigchld_action.sa_flags = SA_RESTART;
 215 #else
 216     sigchld_action.sa_flags = 0;
 217 #endif /* !SA_RESTART */
 218
 219     if (sigaction (SIGCHLD, &sigchld_action, NULL) == -1)
 220     {
 221 #ifdef HAVE_SUBSHELL_SUPPORT
 222         /*
 223          * This may happen on QNX Neutrino 6, where SA_RESTART
 224          * is defined but not implemented.  Fallback to no subshell.
 225          */
 226         mc_global.tty.use_subshell = FALSE;
 227 #endif /* HAVE_SUBSHELL_SUPPORT */
 228     }
 229 }
 230
 231 /* --------------------------------------------------------------------------------------------- */
 232 /*** public functions ****************************************************************************/
 233 /* --------------------------------------------------------------------------------------------- */
 234
 235 int
 236 main (int argc, char *argv[])
 237 {
 238     GError *error = NULL;
 239     int exit_code = EXIT_FAILURE;
 240
 241     /* We had LC_CTYPE before, LC_ALL includs LC_TYPE as well */
 242 #ifdef HAVE_SETLOCALE
 243     (void) setlocale (LC_ALL, "");
 244 #endif
 245     (void) bindtextdomain (PACKAGE, LOCALEDIR);
 246     (void) textdomain (PACKAGE);
 247
 248     /* do this before args parsing */
 249     str_init_strings (NULL);
 250
 251     if (!mc_args_parse (&argc, &argv, "mc", &error))
 252     {
 253       startup_exit_falure:
 254         fprintf (stderr, _("Failed to run:\n%s\n"), error->message);
 255         g_error_free (error);
 256         g_free (shell);
 257       startup_exit_ok:
 258         str_uninit_strings ();
 259         return exit_code;
 260     }
 261
 262     /* do this before mc_args_show_info () to view paths in the --datadir-info output */
 263     OS_Setup ();
 264
 265     if (!g_path_is_absolute (mc_config_get_home_dir ()))
 266     {
 267         error = g_error_new (MC_ERROR, 0, "%s: %s", _("Home directory path is not absolute"),
 268                              mc_config_get_home_dir ());
 269         mc_event_deinit (NULL);
 270         goto startup_exit_falure;
 271     }
 272
 273     if (!mc_args_show_info ())
 274     {
 275         exit_code = EXIT_SUCCESS;
 276         goto startup_exit_ok;
 277     }
 278
 279     if (!events_init (&error))
 280         goto startup_exit_falure;
 281
 282     mc_config_init_config_paths (&error);
 283     if (error == NULL && mc_config_deprecated_dir_present ())
 284         mc_config_migrate_from_old_place (&error);
 285     if (error != NULL)
 286     {
 287         mc_event_deinit (NULL);
 288         goto startup_exit_falure;
 289     }
 290
 291     vfs_init ();
 292     vfs_plugins_init ();
 293     vfs_setup_work_dir ();
 294
 295     /* do this after vfs initialization due to mc_setctl() call in mc_setup_by_args() */
 296     if (!mc_setup_by_args (argc, argv, &error))
 297     {
 298         vfs_shut ();
 299         mc_event_deinit (NULL);
 300         goto startup_exit_falure;
 301     }
 302
 303     /* check terminal type
 304      * $TEMR must be set and not empty
 305      * mc_global.tty.xterm_flag is used in init_key() and tty_init()
 306      * Do this after mc_args_handle() where mc_args__force_xterm is set up.
 307      */
 308     mc_global.tty.xterm_flag = tty_check_term (mc_args__force_xterm);
 309
 310     /* NOTE: This has to be called before tty_init or whatever routine
 311        calls any define_sequence */
 312     init_key ();
 313
 314     /* Must be done before installing the SIGCHLD handler [[FIXME]] */
 315     handle_console (CONSOLE_INIT);
 316
 317 #ifdef HAVE_SUBSHELL_SUPPORT
 318     /* Don't use subshell when invoked as viewer or editor */
 319     if (mc_global.mc_run_mode != MC_RUN_FULL)
 320         mc_global.tty.use_subshell = FALSE;
 321
 322     if (mc_global.tty.use_subshell)
 323         subshell_get_console_attributes ();
 324 #endif /* HAVE_SUBSHELL_SUPPORT */
 325
 326     /* Install the SIGCHLD handler; must be done before init_subshell() */
 327     init_sigchld ();
 328
 329     /* We need this, since ncurses endwin () doesn't restore the signals */
 330     save_stop_handler ();
 331
 332     /* Must be done before init_subshell, to set up the terminal size: */
 333     /* FIXME: Should be removed and LINES and COLS computed on subshell */
 334     tty_init (!mc_args__nomouse, mc_global.tty.xterm_flag);
 335
 336     load_setup ();
 337
 338     /* start check mc_global.display_codepage and mc_global.source_codepage */
 339     check_codeset ();
 340
 341     /* Removing this from the X code let's us type C-c */
 342     load_key_defs ();
 343
 344     load_keymap_defs (!mc_args__nokeymap);
 345
 346     macros_list = g_array_new (TRUE, FALSE, sizeof (macros_t));
 347
 348     tty_init_colors (mc_global.tty.disable_colors, mc_args__force_colors);
 349
 350     mc_skin_init (&error);
 351     if (error != NULL)
 352     {
 353         message (D_ERROR, _("Warning"), "%s", error->message);
 354         g_error_free (error);
 355         error = NULL;
 356     }
 357
 358     mc_filehighlight = mc_fhl_new (TRUE);
 359     dlg_set_default_colors ();
 360
 361 #ifdef HAVE_SUBSHELL_SUPPORT
 362     /* Done here to ensure that the subshell doesn't  */
 363     /* inherit the file descriptors opened below, etc */
 364     if (mc_global.tty.use_subshell)
 365         init_subshell ();
 366
 367 #endif /* HAVE_SUBSHELL_SUPPORT */
 368
 369     /* Also done after init_subshell, to save any shell init file messages */
 370     if (mc_global.tty.console_flag != '\0')
 371         handle_console (CONSOLE_SAVE);
 372
 373     if (mc_global.tty.alternate_plus_minus)
 374         application_keypad_mode ();
 375
 376 #ifdef HAVE_SUBSHELL_SUPPORT
 377     if (mc_global.tty.use_subshell)
 378     {
 379         mc_prompt = strip_ctrl_codes (subshell_prompt);
 380         if (mc_prompt == NULL)
 381             mc_prompt = (geteuid () == 0) ? "# " : "$ ";
 382     }
 383     else
 384 #endif /* HAVE_SUBSHELL_SUPPORT */
 385         mc_prompt = (geteuid () == 0) ? "# " : "$ ";
 386
 387     /* Program main loop */
 388     if (mc_global.midnight_shutdown)
 389         exit_code = EXIT_SUCCESS;
 390     else
 391         exit_code = do_nc ()? EXIT_SUCCESS : EXIT_FAILURE;
 392
 393     /* Save the tree store */
 394     (void) tree_store_save ();
 395
 396     free_keymap_defs ();
 397
 398     /* Virtual File System shutdown */
 399     vfs_shut ();
 400
 401     flush_extension_file ();    /* does only free memory */
 402
 403     mc_fhl_free (&mc_filehighlight);
 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 /* --------------------------------------------------------------------------------------------- */