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Diffstat (limited to 'src/main.c')
| -rw-r--r-- | src/main.c | 556 |
1 files changed, 556 insertions, 0 deletions
diff --git a/src/main.c b/src/main.c new file mode 100644 index 0000000..c18e069 --- /dev/null +++ b/src/main.c @@ -0,0 +1,556 @@ +/* + Main program for the Midnight Commander + + Copyright (C) 1994-2023 + Free Software Foundation, Inc. + + Written by: + Miguel de Icaza, 1994, 1995, 1996, 1997 + Janne Kukonlehto, 1994, 1995 + Norbert Warmuth, 1997 + + This file is part of the Midnight Commander. + + The Midnight Commander is free software: you can redistribute it + and/or modify it under the terms of the GNU General Public License as + published by the Free Software Foundation, either version 3 of the License, + or (at your option) any later version. + + The Midnight Commander is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +/** \file main.c + * \brief Source: this is a main module + */ + +#include <config.h> + +#include <ctype.h> +#include <errno.h> +#include <locale.h> +#include <pwd.h> /* for username in xterm title */ +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/types.h> +#include <sys/wait.h> +#include <signal.h> +#include <unistd.h> /* getsid() */ + +#include "lib/global.h" + +#include "lib/event.h" +#include "lib/tty/tty.h" +#include "lib/tty/key.h" /* For init_key() */ +#include "lib/tty/mouse.h" /* init_mouse() */ +#include "lib/skin.h" +#include "lib/filehighlight.h" +#include "lib/fileloc.h" +#include "lib/strutil.h" +#include "lib/util.h" +#include "lib/vfs/vfs.h" /* vfs_init(), vfs_shut() */ + +#include "filemanager/filemanager.h" +#include "filemanager/treestore.h" /* tree_store_save */ +#include "filemanager/layout.h" +#include "filemanager/ext.h" /* flush_extension_file() */ +#include "filemanager/command.h" /* cmdline */ +#include "filemanager/panel.h" /* panalized_panel */ + +#include "vfs/plugins_init.h" + +#include "events_init.h" +#include "args.h" +#ifdef ENABLE_SUBSHELL +#include "subshell/subshell.h" +#endif +#include "keymap.h" +#include "setup.h" /* load_setup() */ + +#ifdef HAVE_CHARSET +#include "lib/charsets.h" +#include "selcodepage.h" +#endif /* HAVE_CHARSET */ + +#include "consaver/cons.saver.h" /* cons_saver_pid */ + +/*** global variables ****************************************************************************/ + +/*** file scope macro definitions ****************************************************************/ + +/*** file scope type declarations ****************************************************************/ + +/*** forward declarations (file scope functions) *************************************************/ + +/*** file scope variables ************************************************************************/ + +/* --------------------------------------------------------------------------------------------- */ +/*** file scope functions ************************************************************************/ +/* --------------------------------------------------------------------------------------------- */ + +static void +check_codeset (void) +{ + const char *current_system_codepage = NULL; + + current_system_codepage = str_detect_termencoding (); + +#ifdef HAVE_CHARSET + { + const char *_display_codepage; + + _display_codepage = get_codepage_id (mc_global.display_codepage); + + if (strcmp (_display_codepage, current_system_codepage) != 0) + { + mc_global.display_codepage = get_codepage_index (current_system_codepage); + if (mc_global.display_codepage == -1) + mc_global.display_codepage = 0; + + mc_config_set_string (mc_global.main_config, CONFIG_MISC_SECTION, "display_codepage", + cp_display); + } + } +#endif + + mc_global.utf8_display = str_isutf8 (current_system_codepage); +} + +/* --------------------------------------------------------------------------------------------- */ +/** POSIX version. The only version we support. */ + +static void +OS_Setup (void) +{ + const char *datadir_env; + + mc_shell_init (); + + /* This is the directory, where MC was installed, on Unix this is DATADIR */ + /* and can be overridden by the MC_DATADIR environment variable */ + datadir_env = g_getenv ("MC_DATADIR"); + if (datadir_env != NULL) + mc_global.sysconfig_dir = g_strdup (datadir_env); + else + mc_global.sysconfig_dir = g_strdup (SYSCONFDIR); + + mc_global.share_data_dir = g_strdup (DATADIR); +} + +/* --------------------------------------------------------------------------------------------- */ + +static void +sigchld_handler_no_subshell (int sig) +{ +#ifdef __linux__ + int pid, status; + + if (mc_global.tty.console_flag == '\0') + return; + + /* COMMENT: if it were true that after the call to handle_console(..INIT) + the value of mc_global.tty.console_flag never changed, we could simply not install + this handler at all if (!mc_global.tty.console_flag && !mc_global.tty.use_subshell). */ + + /* That comment is no longer true. We need to wait() on a sigchld + handler (that's at least what the tarfs code expects currently). */ + + pid = waitpid (cons_saver_pid, &status, WUNTRACED | WNOHANG); + + if (pid == cons_saver_pid) + { + if (WIFSTOPPED (status)) + { + /* Someone has stopped cons.saver - restart it */ + kill (pid, SIGCONT); + } + else + { + /* cons.saver has died - disable console saving */ + handle_console (CONSOLE_DONE); + mc_global.tty.console_flag = '\0'; + } + } + /* If we got here, some other child exited; ignore it */ +#endif /* __linux__ */ + + (void) sig; +} + +/* --------------------------------------------------------------------------------------------- */ + +static void +init_sigchld (void) +{ + struct sigaction sigchld_action; + + memset (&sigchld_action, 0, sizeof (sigchld_action)); + sigchld_action.sa_handler = +#ifdef ENABLE_SUBSHELL + mc_global.tty.use_subshell ? sigchld_handler : +#endif /* ENABLE_SUBSHELL */ + sigchld_handler_no_subshell; + + sigemptyset (&sigchld_action.sa_mask); + +#ifdef SA_RESTART + sigchld_action.sa_flags = SA_RESTART; +#endif /* !SA_RESTART */ + + if (sigaction (SIGCHLD, &sigchld_action, NULL) == -1) + { +#ifdef ENABLE_SUBSHELL + /* + * This may happen on QNX Neutrino 6, where SA_RESTART + * is defined but not implemented. Fallback to no subshell. + */ + mc_global.tty.use_subshell = FALSE; +#endif /* ENABLE_SUBSHELL */ + } +} + +/* --------------------------------------------------------------------------------------------- */ +/** + * Check MC_SID to prevent running one mc from another. + * + * @return TRUE if no parent mc in our session was found, FALSE otherwise. + */ + +static gboolean +check_sid (void) +{ + pid_t my_sid, old_sid; + const char *sid_str; + + sid_str = getenv ("MC_SID"); + if (sid_str == NULL) + return TRUE; + + old_sid = (pid_t) strtol (sid_str, NULL, 0); + if (old_sid == 0) + return TRUE; + + my_sid = getsid (0); + if (my_sid == -1) + return TRUE; + + /* The parent mc is in a different session, it's OK */ + return (old_sid != my_sid); +} + +/* --------------------------------------------------------------------------------------------- */ +/*** public functions ****************************************************************************/ +/* --------------------------------------------------------------------------------------------- */ + +int +main (int argc, char *argv[]) +{ + GError *mcerror = NULL; + int exit_code = EXIT_FAILURE; + + mc_global.run_from_parent_mc = !check_sid (); + + /* We had LC_CTYPE before, LC_ALL includs LC_TYPE as well */ +#ifdef HAVE_SETLOCALE + (void) setlocale (LC_ALL, ""); +#endif + (void) bindtextdomain (PACKAGE, LOCALEDIR); + (void) textdomain (PACKAGE); + + /* do this before args parsing */ + str_init_strings (NULL); + + mc_setup_run_mode (argv); /* are we mc? editor? viewer? etc... */ + + if (!mc_args_parse (&argc, &argv, "mc", &mcerror)) + { + startup_exit_falure: + fprintf (stderr, _("Failed to run:\n%s\n"), mcerror->message); + g_error_free (mcerror); + startup_exit_ok: + mc_shell_deinit (); + str_uninit_strings (); + return exit_code; + } + + /* do this before mc_args_show_info () to view paths in the --datadir-info output */ + OS_Setup (); + + if (!g_path_is_absolute (mc_config_get_home_dir ())) + { + mc_propagate_error (&mcerror, 0, "%s: %s", _("Home directory path is not absolute"), + mc_config_get_home_dir ()); + mc_event_deinit (NULL); + goto startup_exit_falure; + } + + if (!mc_args_show_info ()) + { + exit_code = EXIT_SUCCESS; + goto startup_exit_ok; + } + + if (!events_init (&mcerror)) + goto startup_exit_falure; + + mc_config_init_config_paths (&mcerror); + if (mcerror != NULL) + { + mc_event_deinit (NULL); + goto startup_exit_falure; + } + + vfs_init (); + vfs_plugins_init (); + + load_setup (); + + /* Must be done after load_setup because depends on mc_global.vfs.cd_symlinks */ + vfs_setup_work_dir (); + + /* Set up temporary directory after VFS initialization */ + mc_tmpdir (); + + /* do this after vfs initialization and vfs working directory setup + due to mc_setctl() and mcedit_arg_vpath_new() calls in mc_setup_by_args() */ + if (!mc_setup_by_args (argc, argv, &mcerror)) + { + vfs_shut (); + done_setup (); + g_free (saved_other_dir); + mc_event_deinit (NULL); + goto startup_exit_falure; + } + + /* Resolve the other_dir panel option. + * 1. Must be done after vfs_setup_work_dir(). + * 2. Must be done after mc_setup_by_args() because of mc_run_mode. + */ + if (mc_global.mc_run_mode == MC_RUN_FULL) + { + char *buffer; + vfs_path_t *vpath; + + buffer = mc_config_get_string (mc_global.panels_config, "Dirs", "other_dir", "."); + vpath = vfs_path_from_str (buffer); + if (vfs_file_is_local (vpath)) + saved_other_dir = buffer; + else + g_free (buffer); + vfs_path_free (vpath, TRUE); + } + + /* check terminal type + * $TERM must be set and not empty + * mc_global.tty.xterm_flag is used in init_key() and tty_init() + * Do this after mc_args_handle() where mc_args__force_xterm is set up. + */ + mc_global.tty.xterm_flag = tty_check_term (mc_args__force_xterm); + + /* NOTE: This has to be called before tty_init or whatever routine + calls any define_sequence */ + init_key (); + + /* Must be done before installing the SIGCHLD handler [[FIXME]] */ + handle_console (CONSOLE_INIT); + +#ifdef ENABLE_SUBSHELL + /* Disallow subshell when invoked as standalone viewer or editor from running mc */ + if (mc_global.mc_run_mode != MC_RUN_FULL && mc_global.run_from_parent_mc) + mc_global.tty.use_subshell = FALSE; + + if (mc_global.tty.use_subshell) + subshell_get_console_attributes (); +#endif /* ENABLE_SUBSHELL */ + + /* Install the SIGCHLD handler; must be done before init_subshell() */ + init_sigchld (); + + /* We need this, since ncurses endwin () doesn't restore the signals */ + save_stop_handler (); + + /* Must be done before init_subshell, to set up the terminal size: */ + /* FIXME: Should be removed and LINES and COLS computed on subshell */ + tty_init (!mc_args__nomouse, mc_global.tty.xterm_flag); + + /* start check mc_global.display_codepage and mc_global.source_codepage */ + check_codeset (); + + /* Removing this from the X code let's us type C-c */ + load_key_defs (); + + keymap_load (!mc_args__nokeymap); + +#ifdef USE_INTERNAL_EDIT + macros_list = g_array_new (TRUE, FALSE, sizeof (macros_t)); +#endif /* USE_INTERNAL_EDIT */ + + tty_init_colors (mc_global.tty.disable_colors, mc_args__force_colors); + + mc_skin_init (NULL, &mcerror); + dlg_set_default_colors (); + input_set_default_colors (); + if (mc_global.mc_run_mode == MC_RUN_FULL) + command_set_default_colors (); + + mc_error_message (&mcerror, NULL); + +#ifdef ENABLE_SUBSHELL + /* Done here to ensure that the subshell doesn't */ + /* inherit the file descriptors opened below, etc */ + if (mc_global.tty.use_subshell && mc_global.run_from_parent_mc) + { + int r; + + r = query_dialog (_("Warning"), + _("GNU Midnight Commander\nis already running on this terminal.\n" + "Subshell support will be disabled."), + D_ERROR, 2, _("&OK"), _("&Quit")); + if (r == 0) + { + /* parent mc was found and the user wants to continue */ + ; + } + else + { + /* parent mc was found and the user wants to quit mc */ + mc_global.midnight_shutdown = TRUE; + } + + mc_global.tty.use_subshell = FALSE; + } + + if (mc_global.tty.use_subshell) + init_subshell (); +#endif /* ENABLE_SUBSHELL */ + + if (!mc_global.midnight_shutdown) + { + /* Also done after init_subshell, to save any shell init file messages */ + if (mc_global.tty.console_flag != '\0') + handle_console (CONSOLE_SAVE); + + if (mc_global.tty.alternate_plus_minus) + application_keypad_mode (); + + /* Done after subshell initialization to allow select and paste text by mouse + w/o Shift button in subshell in the native console */ + init_mouse (); + + /* Done after tty_enter_ca_mode (tty_init) because in VTE bracketed mode is + separate for the normal and alternate screens */ + enable_bracketed_paste (); + + /* subshell_prompt is NULL here */ + mc_prompt = (geteuid () == 0) ? "# " : "$ "; + } + + /* Program main loop */ + if (mc_global.midnight_shutdown) + exit_code = EXIT_SUCCESS; + else + exit_code = do_nc ()? EXIT_SUCCESS : EXIT_FAILURE; + + disable_bracketed_paste (); + + disable_mouse (); + + /* Save the tree store */ + (void) tree_store_save (); + + keymap_free (); + + /* Virtual File System shutdown */ + vfs_shut (); + + flush_extension_file (); /* does only free memory */ + + mc_skin_deinit (); + tty_colors_done (); + + tty_shutdown (); + + done_setup (); + + if (mc_global.tty.console_flag != '\0' && (quit & SUBSHELL_EXIT) == 0) + handle_console (CONSOLE_RESTORE); + if (mc_global.tty.alternate_plus_minus) + numeric_keypad_mode (); + + (void) signal (SIGCHLD, SIG_DFL); /* Disable the SIGCHLD handler */ + + if (mc_global.tty.console_flag != '\0') + handle_console (CONSOLE_DONE); + + if (mc_global.mc_run_mode == MC_RUN_FULL && mc_args__last_wd_file != NULL + && last_wd_string != NULL && !print_last_revert) + { + int last_wd_fd; + + last_wd_fd = open (mc_args__last_wd_file, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, + S_IRUSR | S_IWUSR); + if (last_wd_fd != -1) + { + ssize_t ret1; + int ret2; + ret1 = write (last_wd_fd, last_wd_string, strlen (last_wd_string)); + ret2 = close (last_wd_fd); + (void) ret1; + (void) ret2; + } + } + g_free (last_wd_string); + + mc_shell_deinit (); + + done_key (); + +#ifdef USE_INTERNAL_EDIT + if (macros_list != NULL) + { + guint i; + + for (i = 0; i < macros_list->len; i++) + { + macros_t *macros; + + macros = &g_array_index (macros_list, struct macros_t, i); + if (macros != NULL && macros->macro != NULL) + (void) g_array_free (macros->macro, TRUE); + } + (void) g_array_free (macros_list, TRUE); + } +#endif /* USE_INTERNAL_EDIT */ + + str_uninit_strings (); + + if (mc_global.mc_run_mode != MC_RUN_EDITOR) + g_free (mc_run_param0); + else + g_list_free_full ((GList *) mc_run_param0, (GDestroyNotify) mcedit_arg_free); + + g_free (mc_run_param1); + g_free (saved_other_dir); + + mc_config_deinit_config_paths (); + + (void) mc_event_deinit (&mcerror); + if (mcerror != NULL) + { + fprintf (stderr, _("\nFailed while close:\n%s\n"), mcerror->message); + g_error_free (mcerror); + exit_code = EXIT_FAILURE; + } + + (void) putchar ('\n'); /* Hack to make shell's prompt start at left of screen */ + + return exit_code; +} + +/* --------------------------------------------------------------------------------------------- */ |