/*-*- Mode: C; c-basic-offset: 8 -*-*/ /*** This file is part of systemd. Copyright 2010 Lennart Poettering systemd 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 2 of the License, or (at your option) any later version. systemd 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 systemd; If not, see . ***/ #include #include #include #include #include #include #include #include #include #include #include "log.h" #include "util.h" #include "macro.h" #include "set.h" #include "utmp-wtmp.h" #include "special.h" static const char *arg_type = NULL; static bool arg_all = false; static bool arg_replace = false; static bool arg_session = false; static bool arg_block = false; static bool arg_immediate = false; static bool arg_no_wtmp = false; static bool arg_no_sync = false; static bool arg_no_wall = false; static bool arg_dry = false; static char **arg_wall = NULL; enum action { ACTION_INVALID, ACTION_SYSTEMCTL, ACTION_HALT, ACTION_POWEROFF, ACTION_REBOOT, ACTION_RUNLEVEL2, ACTION_RUNLEVEL3, ACTION_RUNLEVEL4, ACTION_RUNLEVEL5, ACTION_RESCUE, ACTION_EMERGENCY, ACTION_DEFAULT, ACTION_RELOAD, ACTION_REEXEC, ACTION_RUNLEVEL, _ACTION_MAX } arg_action = ACTION_SYSTEMCTL; static bool error_is_no_service(DBusError *error) { assert(error); if (!dbus_error_is_set(error)) return false; if (dbus_error_has_name(error, DBUS_ERROR_NAME_HAS_NO_OWNER)) return true; if (dbus_error_has_name(error, DBUS_ERROR_SERVICE_UNKNOWN)) return true; return startswith(error->name, "org.freedesktop.DBus.Error.Spawn."); } static int bus_iter_get_basic_and_next(DBusMessageIter *iter, int type, void *data, bool next) { assert(iter); assert(data); if (dbus_message_iter_get_arg_type(iter) != type) return -EIO; dbus_message_iter_get_basic(iter, data); if (!dbus_message_iter_next(iter) != !next) return -EIO; return 0; } static int columns(void) { static int parsed_columns = 0; const char *e; if (parsed_columns > 0) return parsed_columns; if ((e = getenv("COLUMNS"))) parsed_columns = atoi(e); if (parsed_columns <= 0) { struct winsize ws; zero(ws); if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) >= 0) parsed_columns = ws.ws_col; } if (parsed_columns <= 0) parsed_columns = 80; return parsed_columns; } static void warn_wall(enum action action) { static const char *table[_ACTION_MAX] = { [ACTION_HALT] = "The system is going down for system halt NOW!", [ACTION_REBOOT] = "The system is going down for reboot NOW!", [ACTION_POWEROFF] = "The system is going down for power-off NOW!", [ACTION_RESCUE] = "The system is going down to rescue mode NOW!", [ACTION_EMERGENCY] = "The system is going down to emergency mode NOW!" }; if (arg_no_wall) return; if (!table[action]) return; utmp_wall(table[action]); } static int list_units(DBusConnection *bus, char **args, unsigned n) { DBusMessage *m = NULL, *reply = NULL; DBusError error; int r; DBusMessageIter iter, sub, sub2; unsigned k = 0; dbus_error_init(&error); assert(bus); if (!(m = dbus_message_new_method_call( "org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "ListUnits"))) { log_error("Could not allocate message."); return -ENOMEM; } if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) { log_error("Failed to issue method call: %s", error.message); r = -EIO; goto finish; } if (!dbus_message_iter_init(reply, &iter) || dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY || dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRUCT) { log_error("Failed to parse reply."); r = -EIO; goto finish; } dbus_message_iter_recurse(&iter, &sub); printf("%-45s %-6s %-12s %-12s %-15s %s\n", "UNIT", "LOAD", "ACTIVE", "SUB", "JOB", "DESCRIPTION"); while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) { const char *id, *description, *load_state, *active_state, *sub_state, *unit_state, *job_type, *job_path, *dot; uint32_t job_id; if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_STRUCT) { log_error("Failed to parse reply."); r = -EIO; goto finish; } dbus_message_iter_recurse(&sub, &sub2); if (bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &id, true) < 0 || bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &description, true) < 0 || bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &load_state, true) < 0 || bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &active_state, true) < 0 || bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &sub_state, true) < 0 || bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_OBJECT_PATH, &unit_state, true) < 0 || bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_UINT32, &job_id, true) < 0 || bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &job_type, true) < 0 || bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_OBJECT_PATH, &job_path, false) < 0) { log_error("Failed to parse reply."); r = -EIO; goto finish; } if ((!arg_type || ((dot = strrchr(id, '.')) && streq(dot+1, arg_type))) && (arg_all || !streq(active_state, "inactive"))) { int a = 0, b = 0; printf("%-45s %-6s %-12s %-12s%n", id, load_state, active_state, sub_state, &a); if (job_id != 0) printf(" %-15s%n", job_type, &b); else b = 1 + 15; if (a + b + 2 < columns()) { if (job_id == 0) printf(" "); printf("%.*s", columns() - a - b - 2, description); } fputs("\n", stdout); k++; } dbus_message_iter_next(&sub); } if (arg_all) printf("\n%u units listed.\n", k); else printf("\n%u live units listed. Pass --all to see dead units, too.\n", k); r = 0; finish: if (m) dbus_message_unref(m); if (reply) dbus_message_unref(reply); dbus_error_free(&error); return r; } static int list_jobs(DBusConnection *bus, char **args, unsigned n) { DBusMessage *m = NULL, *reply = NULL; DBusError error; int r; DBusMessageIter iter, sub, sub2; unsigned k = 0; dbus_error_init(&error); assert(bus); if (!(m = dbus_message_new_method_call( "org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "ListJobs"))) { log_error("Could not allocate message."); return -ENOMEM; } if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) { log_error("Failed to issue method call: %s", error.message); r = -EIO; goto finish; } if (!dbus_message_iter_init(reply, &iter) || dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY || dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRUCT) { log_error("Failed to parse reply."); r = -EIO; goto finish; } dbus_message_iter_recurse(&iter, &sub); printf("%4s %-45s %-17s %-7s\n", "JOB", "UNIT", "TYPE", "STATE"); while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) { const char *name, *type, *state, *job_path, *unit_path; uint32_t id; if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_STRUCT) { log_error("Failed to parse reply."); r = -EIO; goto finish; } dbus_message_iter_recurse(&sub, &sub2); if (bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_UINT32, &id, true) < 0 || bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &name, true) < 0 || bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &type, true) < 0 || bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &state, true) < 0 || bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_OBJECT_PATH, &job_path, true) < 0 || bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_OBJECT_PATH, &unit_path, false) < 0) { log_error("Failed to parse reply."); r = -EIO; goto finish; } printf("%4u %-45s %-17s %-7s\n", id, name, type, state); k++; dbus_message_iter_next(&sub); } printf("\n%u jobs listed.\n", k); r = 0; finish: if (m) dbus_message_unref(m); if (reply) dbus_message_unref(reply); dbus_error_free(&error); return r; } static int load_unit(DBusConnection *bus, char **args, unsigned n) { DBusMessage *m = NULL, *reply = NULL; DBusError error; int r; unsigned i; dbus_error_init(&error); assert(bus); assert(args); for (i = 1; i < n; i++) { if (!(m = dbus_message_new_method_call( "org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "LoadUnit"))) { log_error("Could not allocate message."); r = -ENOMEM; goto finish; } if (!dbus_message_append_args(m, DBUS_TYPE_STRING, &args[i], DBUS_TYPE_INVALID)) { log_error("Could not append arguments to message."); r = -ENOMEM; goto finish; } if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) { log_error("Failed to issue method call: %s", error.message); r = -EIO; goto finish; } dbus_message_unref(m); dbus_message_unref(reply); m = reply = NULL; } r = 0; finish: if (m) dbus_message_unref(m); if (reply) dbus_message_unref(reply); dbus_error_free(&error); return r; } static int cancel_job(DBusConnection *bus, char **args, unsigned n) { DBusMessage *m = NULL, *reply = NULL; DBusError error; int r; unsigned i; dbus_error_init(&error); assert(bus); assert(args); for (i = 1; i < n; i++) { unsigned id; const char *path; if (!(m = dbus_message_new_method_call( "org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "GetJob"))) { log_error("Could not allocate message."); r = -ENOMEM; goto finish; } if ((r = safe_atou(args[i], &id)) < 0) { log_error("Failed to parse job id: %s", strerror(-r)); goto finish; } assert_cc(sizeof(uint32_t) == sizeof(id)); if (!dbus_message_append_args(m, DBUS_TYPE_UINT32, &id, DBUS_TYPE_INVALID)) { log_error("Could not append arguments to message."); r = -ENOMEM; goto finish; } if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) { log_error("Failed to issue method call: %s", error.message); r = -EIO; goto finish; } if (!dbus_message_get_args(reply, &error, DBUS_TYPE_OBJECT_PATH, &path, DBUS_TYPE_INVALID)) { log_error("Failed to parse reply: %s", error.message); r = -EIO; goto finish; } dbus_message_unref(m); if (!(m = dbus_message_new_method_call( "org.freedesktop.systemd1", path, "org.freedesktop.systemd1.Job", "Cancel"))) { log_error("Could not allocate message."); r = -ENOMEM; goto finish; } dbus_message_unref(reply); if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) { log_error("Failed to issue method call: %s", error.message); r = -EIO; goto finish; } dbus_message_unref(m); dbus_message_unref(reply); m = reply = NULL; } r = 0; finish: if (m) dbus_message_unref(m); if (reply) dbus_message_unref(reply); dbus_error_free(&error); return r; } static DBusHandlerResult wait_filter(DBusConnection *connection, DBusMessage *message, void *data) { DBusError error; Set *s = data; assert(connection); assert(message); assert(s); dbus_error_init(&error); /* log_debug("Got D-Bus request: %s.%s() on %s", */ /* dbus_message_get_interface(message), */ /* dbus_message_get_member(message), */ /* dbus_message_get_path(message)); */ if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) { log_error("Warning! D-Bus connection terminated."); dbus_connection_close(connection); } else if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Manager", "JobRemoved")) { uint32_t id; const char *path; if (!dbus_message_get_args(message, &error, DBUS_TYPE_UINT32, &id, DBUS_TYPE_OBJECT_PATH, &path, DBUS_TYPE_INVALID)) log_error("Failed to parse message: %s", error.message); else { char *p; if ((p = set_remove(s, (char*) path))) free(p); } } dbus_error_free(&error); return DBUS_HANDLER_RESULT_NOT_YET_HANDLED; } static int enable_wait_for_jobs(DBusConnection *bus) { DBusError error; DBusMessage *m = NULL, *reply = NULL; int r; assert(bus); dbus_error_init(&error); dbus_bus_add_match(bus, "type='signal'," "sender='org.freedesktop.systemd1'," "interface='org.freedesktop.systemd1.Manager'," "member='JobRemoved'," "path='/org/freedesktop/systemd1'", &error); if (dbus_error_is_set(&error)) { log_error("Failed to add match: %s", error.message); r = -EIO; goto finish; } if (!(m = dbus_message_new_method_call( "org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "Subscribe"))) { log_error("Could not allocate message."); r = -ENOMEM; goto finish; } if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) { log_error("Failed to issue method call: %s", error.message); r = -EIO; goto finish; } r = 0; finish: /* This is slightly dirty, since we don't undo the match registrations. */ if (m) dbus_message_unref(m); if (reply) dbus_message_unref(reply); dbus_error_free(&error); return r; } static int wait_for_jobs(DBusConnection *bus, Set *s) { int r; assert(bus); assert(s); if (!dbus_connection_add_filter(bus, wait_filter, s, NULL)) { log_error("Failed to add filter."); r = -ENOMEM; goto finish; } while (!set_isempty(s) && dbus_connection_read_write_dispatch(bus, -1)) ; r = 0; finish: /* This is slightly dirty, since we don't undo the filter registration. */ return r; } static int start_unit_one( DBusConnection *bus, const char *method, const char *name, const char *mode, Set *s) { DBusMessage *m = NULL, *reply = NULL; DBusError error; int r; assert(bus); assert(method); assert(name); assert(mode); assert(!arg_block || s); dbus_error_init(&error); if (!(m = dbus_message_new_method_call( "org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", method))) { log_error("Could not allocate message."); r = -ENOMEM; goto finish; } if (!dbus_message_append_args(m, DBUS_TYPE_STRING, &name, DBUS_TYPE_STRING, &mode, DBUS_TYPE_INVALID)) { log_error("Could not append arguments to message."); r = -ENOMEM; goto finish; } if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) { if (arg_action != ACTION_SYSTEMCTL && error_is_no_service(&error)) { /* There's always a fallback possible for * legacy actions. */ r = 0; goto finish; } log_error("Failed to issue method call: %s", error.message); r = -EIO; goto finish; } if (arg_block) { const char *path; char *p; if (!dbus_message_get_args(reply, &error, DBUS_TYPE_OBJECT_PATH, &path, DBUS_TYPE_INVALID)) { log_error("Failed to parse reply: %s", error.message); r = -EIO; goto finish; } if (!(p = strdup(path))) { log_error("Failed to duplicate path."); r = -ENOMEM; goto finish; } if ((r = set_put(s, p)) < 0) { free(p); log_error("Failed to add path to set."); goto finish; } } r = 1; finish: if (m) dbus_message_unref(m); if (reply) dbus_message_unref(reply); dbus_error_free(&error); return r; } static enum action verb_to_action(const char *verb) { if (streq(verb, "halt")) return ACTION_HALT; else if (streq(verb, "poweroff")) return ACTION_POWEROFF; else if (streq(verb, "reboot")) return ACTION_REBOOT; else if (streq(verb, "rescue")) return ACTION_RESCUE; else if (streq(verb, "emergency")) return ACTION_EMERGENCY; else if (streq(verb, "default")) return ACTION_DEFAULT; else return ACTION_INVALID; } static int start_unit(DBusConnection *bus, char **args, unsigned n) { static const char * const table[_ACTION_MAX] = { [ACTION_HALT] = SPECIAL_HALT_TARGET, [ACTION_POWEROFF] = SPECIAL_POWEROFF_TARGET, [ACTION_REBOOT] = SPECIAL_REBOOT_TARGET, [ACTION_RUNLEVEL2] = SPECIAL_RUNLEVEL2_TARGET, [ACTION_RUNLEVEL3] = SPECIAL_RUNLEVEL3_TARGET, [ACTION_RUNLEVEL4] = SPECIAL_RUNLEVEL4_TARGET, [ACTION_RUNLEVEL5] = SPECIAL_RUNLEVEL5_TARGET, [ACTION_RESCUE] = SPECIAL_RESCUE_TARGET, [ACTION_EMERGENCY] = SPECIAL_EMERGENCY_SERVICE, [ACTION_DEFAULT] = SPECIAL_DEFAULT_TARGET }; int r; unsigned i; const char *method, *mode, *one_name; Set *s = NULL; assert(bus); if (arg_action == ACTION_SYSTEMCTL) { method = streq(args[0], "stop") ? "StopUnit" : streq(args[0], "reload") ? "ReloadUnit" : streq(args[0], "restart") ? "RestartUnit" : "StartUnit"; mode = (streq(args[0], "isolate") || streq(args[0], "rescue") || streq(args[0], "emergency")) ? "isolate" : arg_replace ? "replace" : "fail"; one_name = table[verb_to_action(args[0])]; } else { assert(arg_action < ELEMENTSOF(table)); assert(table[arg_action]); method = "StartUnit"; mode = (arg_action == ACTION_EMERGENCY || arg_action == ACTION_RESCUE) ? "isolate" : "replace"; one_name = table[arg_action]; } if (arg_block) { if ((r = enable_wait_for_jobs(bus)) < 0) { log_error("Could not watch jobs: %s", strerror(-r)); goto finish; } if (!(s = set_new(string_hash_func, string_compare_func))) { log_error("Failed to allocate set."); r = -ENOMEM; goto finish; } } r = 0; if (one_name) { if ((r = start_unit_one(bus, method, one_name, mode, s)) <= 0) goto finish; } else { for (i = 1; i < n; i++) if ((r = start_unit_one(bus, method, args[i], mode, s)) < 0) goto finish; } if (arg_block) r = wait_for_jobs(bus, s); finish: if (s) set_free_free(s); return r; } static int start_special(DBusConnection *bus, char **args, unsigned n) { assert(bus); assert(args); warn_wall(verb_to_action(args[0])); return start_unit(bus, args, n); } static DBusHandlerResult monitor_filter(DBusConnection *connection, DBusMessage *message, void *data) { DBusError error; DBusMessage *m = NULL, *reply = NULL; assert(connection); assert(message); dbus_error_init(&error); /* log_debug("Got D-Bus request: %s.%s() on %s", */ /* dbus_message_get_interface(message), */ /* dbus_message_get_member(message), */ /* dbus_message_get_path(message)); */ if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) { log_error("Warning! D-Bus connection terminated."); dbus_connection_close(connection); } else if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Manager", "UnitNew") || dbus_message_is_signal(message, "org.freedesktop.systemd1.Manager", "UnitRemoved")) { const char *id, *path; if (!dbus_message_get_args(message, &error, DBUS_TYPE_STRING, &id, DBUS_TYPE_OBJECT_PATH, &path, DBUS_TYPE_INVALID)) log_error("Failed to parse message: %s", error.message); else if (streq(dbus_message_get_member(message), "UnitNew")) printf("Unit %s added.\n", id); else printf("Unit %s removed.\n", id); } else if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Manager", "JobNew") || dbus_message_is_signal(message, "org.freedesktop.systemd1.Manager", "JobRemoved")) { uint32_t id; const char *path; if (!dbus_message_get_args(message, &error, DBUS_TYPE_UINT32, &id, DBUS_TYPE_OBJECT_PATH, &path, DBUS_TYPE_INVALID)) log_error("Failed to parse message: %s", error.message); else if (streq(dbus_message_get_member(message), "JobNew")) printf("Job %u added.\n", id); else printf("Job %u removed.\n", id); } else if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Unit", "Changed") || dbus_message_is_signal(message, "org.freedesktop.systemd1.Job", "Changed")) { const char *path, *interface, *property = "Id"; DBusMessageIter iter, sub; path = dbus_message_get_path(message); interface = dbus_message_get_interface(message); if (!(m = dbus_message_new_method_call( "org.freedesktop.systemd1", path, "org.freedesktop.DBus.Properties", "Get"))) { log_error("Could not allocate message."); goto oom; } if (!dbus_message_append_args(m, DBUS_TYPE_STRING, &interface, DBUS_TYPE_STRING, &property, DBUS_TYPE_INVALID)) { log_error("Could not append arguments to message."); goto finish; } if (!(reply = dbus_connection_send_with_reply_and_block(connection, m, -1, &error))) { log_error("Failed to issue method call: %s", error.message); goto finish; } if (!dbus_message_iter_init(reply, &iter) || dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT) { log_error("Failed to parse reply."); goto finish; } dbus_message_iter_recurse(&iter, &sub); if (streq(interface, "org.freedesktop.systemd1.Unit")) { const char *id; if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_STRING) { log_error("Failed to parse reply."); goto finish; } dbus_message_iter_get_basic(&sub, &id); printf("Unit %s changed.\n", id); } else { uint32_t id; if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_UINT32) { log_error("Failed to parse reply."); goto finish; } dbus_message_iter_get_basic(&sub, &id); printf("Job %u changed.\n", id); } } finish: if (m) dbus_message_unref(m); if (reply) dbus_message_unref(reply); dbus_error_free(&error); return DBUS_HANDLER_RESULT_NOT_YET_HANDLED; oom: if (m) dbus_message_unref(m); if (reply) dbus_message_unref(reply); dbus_error_free(&error); return DBUS_HANDLER_RESULT_NEED_MEMORY; } static int monitor(DBusConnection *bus, char **args, unsigned n) { DBusMessage *m = NULL, *reply = NULL; DBusError error; int r; dbus_error_init(&error); dbus_bus_add_match(bus, "type='signal'," "sender='org.freedesktop.systemd1'," "interface='org.freedesktop.systemd1.Manager'," "path='/org/freedesktop/systemd1'", &error); if (dbus_error_is_set(&error)) { log_error("Failed to add match: %s", error.message); r = -EIO; goto finish; } dbus_bus_add_match(bus, "type='signal'," "sender='org.freedesktop.systemd1'," "interface='org.freedesktop.systemd1.Unit'," "member='Changed'", &error); if (dbus_error_is_set(&error)) { log_error("Failed to add match: %s", error.message); r = -EIO; goto finish; } dbus_bus_add_match(bus, "type='signal'," "sender='org.freedesktop.systemd1'," "interface='org.freedesktop.systemd1.Job'," "member='Changed'", &error); if (dbus_error_is_set(&error)) { log_error("Failed to add match: %s", error.message); r = -EIO; goto finish; } if (!dbus_connection_add_filter(bus, monitor_filter, NULL, NULL)) { log_error("Failed to add filter."); r = -ENOMEM; goto finish; } if (!(m = dbus_message_new_method_call( "org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "Subscribe"))) { log_error("Could not allocate message."); r = -ENOMEM; goto finish; } if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) { log_error("Failed to issue method call: %s", error.message); r = -EIO; goto finish; } while (dbus_connection_read_write_dispatch(bus, -1)) ; r = 0; finish: /* This is slightly dirty, since we don't undo the filter or the matches. */ if (m) dbus_message_unref(m); if (reply) dbus_message_unref(reply); dbus_error_free(&error); return r; } static int dump(DBusConnection *bus, char **args, unsigned n) { DBusMessage *m = NULL, *reply = NULL; DBusError error; int r; const char *text; dbus_error_init(&error); if (!(m = dbus_message_new_method_call( "org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "Dump"))) { log_error("Could not allocate message."); return -ENOMEM; } if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) { log_error("Failed to issue method call: %s", error.message); r = -EIO; goto finish; } if (!dbus_message_get_args(reply, &error, DBUS_TYPE_STRING, &text, DBUS_TYPE_INVALID)) { log_error("Failed to parse reply: %s", error.message); r = -EIO; goto finish; } fputs(text, stdout); r = 0; finish: if (m) dbus_message_unref(m); if (reply) dbus_message_unref(reply); dbus_error_free(&error); return r; } static int snapshot(DBusConnection *bus, char **args, unsigned n) { DBusMessage *m = NULL, *reply = NULL; DBusError error; int r; const char *name = "", *path, *id; dbus_bool_t cleanup = FALSE; DBusMessageIter iter, sub; const char *interface = "org.freedesktop.systemd1.Unit", *property = "Id"; dbus_error_init(&error); if (!(m = dbus_message_new_method_call( "org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "CreateSnapshot"))) { log_error("Could not allocate message."); return -ENOMEM; } if (n > 1) name = args[1]; if (!dbus_message_append_args(m, DBUS_TYPE_STRING, &name, DBUS_TYPE_BOOLEAN, &cleanup, DBUS_TYPE_INVALID)) { log_error("Could not append arguments to message."); r = -ENOMEM; goto finish; } if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) { log_error("Failed to issue method call: %s", error.message); r = -EIO; goto finish; } if (!dbus_message_get_args(reply, &error, DBUS_TYPE_OBJECT_PATH, &path, DBUS_TYPE_INVALID)) { log_error("Failed to parse reply: %s", error.message); r = -EIO; goto finish; } dbus_message_unref(m); if (!(m = dbus_message_new_method_call( "org.freedesktop.systemd1", path, "org.freedesktop.DBus.Properties", "Get"))) { log_error("Could not allocate message."); return -ENOMEM; } if (!dbus_message_append_args(m, DBUS_TYPE_STRING, &interface, DBUS_TYPE_STRING, &property, DBUS_TYPE_INVALID)) { log_error("Could not append arguments to message."); r = -ENOMEM; goto finish; } dbus_message_unref(reply); if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) { log_error("Failed to issue method call: %s", error.message); r = -EIO; goto finish; } if (!dbus_message_iter_init(reply, &iter) || dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT) { log_error("Failed to parse reply."); r = -EIO; goto finish; } dbus_message_iter_recurse(&iter, &sub); if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_STRING) { log_error("Failed to parse reply."); r = -EIO; goto finish; } dbus_message_iter_get_basic(&sub, &id); puts(id); r = 0; finish: if (m) dbus_message_unref(m); if (reply) dbus_message_unref(reply); dbus_error_free(&error); return r; } static int clear_jobs(DBusConnection *bus, char **args, unsigned n) { DBusMessage *m = NULL, *reply = NULL; DBusError error; int r; const char *method; dbus_error_init(&error); if (arg_action == ACTION_RELOAD) method = "Reload"; else if (arg_action == ACTION_REEXEC) method = "Reexecute"; else { assert(arg_action == ACTION_SYSTEMCTL); method = streq(args[0], "clear-jobs") ? "ClearJobs" : streq(args[0], "daemon-reload") ? "Reload" : streq(args[0], "daemon-reexec") ? "Reexecute" : "Exit"; } if (!(m = dbus_message_new_method_call( "org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", method))) { log_error("Could not allocate message."); return -ENOMEM; } if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) { if (arg_action != ACTION_SYSTEMCTL && error_is_no_service(&error)) { /* There's always a fallback possible for * legacy actions. */ r = 0; goto finish; } log_error("Failed to issue method call: %s", error.message); r = -EIO; goto finish; } r = 1; finish: if (m) dbus_message_unref(m); if (reply) dbus_message_unref(reply); dbus_error_free(&error); return r; } static int show_enviroment(DBusConnection *bus, char **args, unsigned n) { DBusMessage *m = NULL, *reply = NULL; DBusError error; DBusMessageIter iter, sub, sub2; int r; const char *interface = "org.freedesktop.systemd1.Manager", *property = "Environment"; dbus_error_init(&error); if (!(m = dbus_message_new_method_call( "org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.DBus.Properties", "Get"))) { log_error("Could not allocate message."); return -ENOMEM; } if (!dbus_message_append_args(m, DBUS_TYPE_STRING, &interface, DBUS_TYPE_STRING, &property, DBUS_TYPE_INVALID)) { log_error("Could not append arguments to message."); r = -ENOMEM; goto finish; } if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) { log_error("Failed to issue method call: %s", error.message); r = -EIO; goto finish; } if (!dbus_message_iter_init(reply, &iter) || dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT) { log_error("Failed to parse reply."); r = -EIO; goto finish; } dbus_message_iter_recurse(&iter, &sub); if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_ARRAY || dbus_message_iter_get_element_type(&sub) != DBUS_TYPE_STRING) { log_error("Failed to parse reply."); r = -EIO; goto finish; } dbus_message_iter_recurse(&sub, &sub2); while (dbus_message_iter_get_arg_type(&sub2) != DBUS_TYPE_INVALID) { const char *text; if (dbus_message_iter_get_arg_type(&sub2) != DBUS_TYPE_STRING) { log_error("Failed to parse reply."); r = -EIO; goto finish; } dbus_message_iter_get_basic(&sub2, &text); printf("%s\n", text); dbus_message_iter_next(&sub2); } r = 0; finish: if (m) dbus_message_unref(m); if (reply) dbus_message_unref(reply); dbus_error_free(&error); return r; } static int set_environment(DBusConnection *bus, char **args, unsigned n) { DBusMessage *m = NULL, *reply = NULL; DBusError error; int r; const char *method; DBusMessageIter iter, sub; unsigned i; dbus_error_init(&error); method = streq(args[0], "set-environment") ? "SetEnvironment" : "UnsetEnvironment"; if (!(m = dbus_message_new_method_call( "org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", method))) { log_error("Could not allocate message."); return -ENOMEM; } dbus_message_iter_init_append(m, &iter); if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "s", &sub)) { log_error("Could not append arguments to message."); r = -ENOMEM; goto finish; } for (i = 1; i < n; i++) if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &args[i])) { log_error("Could not append arguments to message."); r = -ENOMEM; goto finish; } if (!dbus_message_iter_close_container(&iter, &sub)) { log_error("Could not append arguments to message."); r = -ENOMEM; goto finish; } if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) { log_error("Failed to issue method call: %s", error.message); r = -EIO; goto finish; } r = 0; finish: if (m) dbus_message_unref(m); if (reply) dbus_message_unref(reply); dbus_error_free(&error); return r; } static int systemctl_help(void) { printf("%s [options]\n\n" "Send control commands to the init daemon.\n\n" " -h --help Show this help\n" " -t --type=TYPE List only units of a particular type\n" " -a --all Show all units, including dead ones\n" " --replace When installing a new job, replace existing conflicting ones\n" " --system Connect to system bus\n" " --session Connect to session bus\n" " --block Wait until operation finished\n" " --no-wall Don't send wall message before reboot/halt/power-off\n\n" "Commands:\n" " list-units List units\n" " list-jobs List jobs\n" " clear-jobs Cancel all jobs\n" " load [NAME...] Load one or more units\n" " cancel [JOB...] Cancel one or more jobs\n" " start [NAME...] Start one or more units\n" " stop [NAME...] Stop one or more units\n" " restart [NAME...] Restart one or more units\n" " reload [NAME...] Reload one or more units\n" " isolate [NAME] Start one unit and stop all others\n" " monitor Monitor unit/job changes\n" " dump Dump server status\n" " snapshot [NAME] Create a snapshot\n" " daemon-reload Reload init daemon configuration\n" " daemon-reexecute Reexecute init daemon\n" " daemon-exit Ask the init daemon to quit\n" " show-environment Dump environment\n" " set-environment [NAME=VALUE...] Set one or more environment variables\n" " unset-environment [NAME...] Unset one or more environment variables\n" " halt Shut down and halt the system\n" " reboot Shut down and reboot the system\n" " poweroff Shut down and power off the system\n" " default Enter default mode\n" " rescue Enter rescue mode\n" " emergency Enter emergency mode\n", program_invocation_short_name); return 0; } static int halt_help(void) { printf("%s [options]\n\n" "%s the system.\n\n" " --help Show this help\n" " --halt Halt the machine\n" " -p --poweroff Switch off the machine\n" " --reboot Reboot the machine\n" " -f --force Force immediate reboot/halt/power-off\n" " -w --wtmp-only Don't reboot/halt/power-off, just write wtmp record\n" " -d --no-wtmp Don't write wtmp record\n" " -n --no-sync Don't sync before reboot/halt/power-off\n" " --no-wall Don't send wall message before reboot/halt/power-off\n", program_invocation_short_name, arg_action == ACTION_REBOOT ? "Reboot" : arg_action == ACTION_POWEROFF ? "Power off" : "Halt"); return 0; } static int shutdown_help(void) { printf("%s [options] [IGNORED] [WALL...]\n\n" "Shut down the system.\n\n" " --help Show this help\n" " -H --halt Halt the machine\n" " -P --poweroff Power-off the machine\n" " -r --reboot Reboot the machine\n" " -h Equivalent to --poweroff, overriden by --halt\n" " -k Don't reboot/halt/power-off, just send warnings\n" " --no-wall Don't send wall message before reboot/halt/power-off\n", program_invocation_short_name); return 0; } static int telinit_help(void) { printf("%s [options]\n\n" "Send control commands to the init daemon.\n\n" " --help Show this help\n" " --no-wall Don't send wall message before reboot/halt/power-off\n\n" "Commands:\n" " 0 Power-off the machine\n" " 6 Reboot the machine\n" " 2, 3, 4, 5 Start runlevelX.target unit\n" " 1, s, S Enter rescue mode\n" " q, Q Reload init daemon configuration\n" " u, U Reexecute init daemon\n", program_invocation_short_name); return 0; } static int runlevel_help(void) { printf("%s [options]\n\n" "Prints the previous and current runlevel of the init system.\n\n" " --help Show this help\n", program_invocation_short_name); return 0; } static int systemctl_parse_argv(int argc, char *argv[]) { enum { ARG_REPLACE = 0x100, ARG_SESSION, ARG_SYSTEM, ARG_BLOCK, ARG_NO_WALL }; static const struct option options[] = { { "help", no_argument, NULL, 'h' }, { "type", required_argument, NULL, 't' }, { "all", no_argument, NULL, 'a' }, { "replace", no_argument, NULL, ARG_REPLACE }, { "session", no_argument, NULL, ARG_SESSION }, { "system", no_argument, NULL, ARG_SYSTEM }, { "block", no_argument, NULL, ARG_BLOCK }, { "no-wall", no_argument, NULL, ARG_NO_WALL }, { NULL, 0, NULL, 0 } }; int c; assert(argc >= 0); assert(argv); while ((c = getopt_long(argc, argv, "hta", options, NULL)) >= 0) { switch (c) { case 'h': systemctl_help(); return 0; case 't': arg_type = optarg; break; case 'a': arg_all = true; break; case ARG_REPLACE: arg_replace = true; break; case ARG_SESSION: arg_session = true; break; case ARG_SYSTEM: arg_session = false; break; case ARG_BLOCK: arg_block = true; break; case ARG_NO_WALL: arg_no_wall = true; break; case '?': return -EINVAL; default: log_error("Unknown option code %c", c); return -EINVAL; } } return 1; } static int halt_parse_argv(int argc, char *argv[]) { enum { ARG_HELP = 0x100, ARG_HALT, ARG_REBOOT, ARG_NO_WALL }; static const struct option options[] = { { "help", no_argument, NULL, ARG_HELP }, { "halt", no_argument, NULL, ARG_HALT }, { "poweroff", no_argument, NULL, 'p' }, { "reboot", no_argument, NULL, ARG_REBOOT }, { "force", no_argument, NULL, 'f' }, { "wtmp-only", no_argument, NULL, 'w' }, { "no-wtmp", no_argument, NULL, 'd' }, { "no-sync", no_argument, NULL, 'n' }, { "no-wall", no_argument, NULL, ARG_NO_WALL }, { NULL, 0, NULL, 0 } }; int c, runlevel; assert(argc >= 0); assert(argv); if (utmp_get_runlevel(&runlevel, NULL) >= 0) if (runlevel == '0' || runlevel == '6') arg_immediate = true; while ((c = getopt_long(argc, argv, "pfwdnih", options, NULL)) >= 0) { switch (c) { case ARG_HELP: halt_help(); return 0; case ARG_HALT: arg_action = ACTION_HALT; break; case 'p': arg_action = ACTION_POWEROFF; break; case ARG_REBOOT: arg_action = ACTION_REBOOT; break; case 'f': arg_immediate = true; break; case 'w': arg_dry = true; break; case 'd': arg_no_wtmp = true; break; case 'n': arg_no_sync = true; break; case ARG_NO_WALL: arg_no_wall = true; break; case 'i': case 'h': /* Compatibility nops */ break; case '?': return -EINVAL; default: log_error("Unknown option code %c", c); return -EINVAL; } } if (optind < argc) { log_error("Too many arguments."); return -EINVAL; } return 1; } static int shutdown_parse_argv(int argc, char *argv[]) { enum { ARG_HELP = 0x100, ARG_NO_WALL }; static const struct option options[] = { { "help", no_argument, NULL, ARG_HELP }, { "halt", no_argument, NULL, 'H' }, { "poweroff", no_argument, NULL, 'P' }, { "reboot", no_argument, NULL, 'r' }, { "no-wall", no_argument, NULL, ARG_NO_WALL }, { NULL, 0, NULL, 0 } }; int c; assert(argc >= 0); assert(argv); while ((c = getopt_long(argc, argv, "HPrhkt:a", options, NULL)) >= 0) { switch (c) { case ARG_HELP: shutdown_help(); return 0; case 'H': arg_action = ACTION_HALT; break; case 'P': arg_action = ACTION_POWEROFF; break; case 'r': arg_action = ACTION_REBOOT; break; case 'h': if (arg_action != ACTION_HALT) arg_action = ACTION_POWEROFF; break; case 'k': arg_dry = true; break; case ARG_NO_WALL: arg_no_wall = true; break; case 't': case 'a': /* Compatibility nops */ break; case '?': return -EINVAL; default: log_error("Unknown option code %c", c); return -EINVAL; } } /* We ignore the time argument */ if (argc > optind + 1) arg_wall = argv + optind + 1; optind = argc; return 1; } static int telinit_parse_argv(int argc, char *argv[]) { enum { ARG_HELP = 0x100, ARG_NO_WALL }; static const struct option options[] = { { "help", no_argument, NULL, ARG_HELP }, { "no-wall", no_argument, NULL, ARG_NO_WALL }, { NULL, 0, NULL, 0 } }; static const struct { char from; enum action to; } table[] = { { '0', ACTION_POWEROFF }, { '6', ACTION_REBOOT }, { '1', ACTION_RESCUE }, { '2', ACTION_RUNLEVEL2 }, { '3', ACTION_RUNLEVEL3 }, { '4', ACTION_RUNLEVEL4 }, { '5', ACTION_RUNLEVEL5 }, { 's', ACTION_RESCUE }, { 'S', ACTION_RESCUE }, { 'q', ACTION_RELOAD }, { 'Q', ACTION_RELOAD }, { 'u', ACTION_REEXEC }, { 'U', ACTION_REEXEC } }; unsigned i; int c; assert(argc >= 0); assert(argv); while ((c = getopt_long(argc, argv, "", options, NULL)) >= 0) { switch (c) { case ARG_HELP: telinit_help(); return 0; case ARG_NO_WALL: arg_no_wall = true; break; case '?': return -EINVAL; default: log_error("Unknown option code %c", c); return -EINVAL; } } if (optind >= argc) { log_error("Argument missing."); return -EINVAL; } if (optind + 1 < argc) { log_error("Too many arguments."); return -EINVAL; } if (strlen(argv[optind]) != 1) { log_error("Expected single character argument."); return -EINVAL; } for (i = 0; i < ELEMENTSOF(table); i++) if (table[i].from == argv[optind][0]) break; if (i >= ELEMENTSOF(table)) { log_error("Unknown command %s.", argv[optind]); return -EINVAL; } arg_action = table[i].to; optind ++; return 1; } static int runlevel_parse_argv(int argc, char *argv[]) { enum { ARG_HELP = 0x100, }; static const struct option options[] = { { "help", no_argument, NULL, ARG_HELP }, { NULL, 0, NULL, 0 } }; int c; assert(argc >= 0); assert(argv); while ((c = getopt_long(argc, argv, "", options, NULL)) >= 0) { switch (c) { case ARG_HELP: runlevel_help(); return 0; case '?': return -EINVAL; default: log_error("Unknown option code %c", c); return -EINVAL; } } if (optind < argc) { log_error("Too many arguments."); return -EINVAL; } return 1; } static int parse_argv(int argc, char *argv[]) { assert(argc >= 0); assert(argv); if (program_invocation_short_name) { if (strstr(program_invocation_short_name, "halt")) { arg_action = ACTION_HALT; return halt_parse_argv(argc, argv); } else if (strstr(program_invocation_short_name, "poweroff")) { arg_action = ACTION_POWEROFF; return halt_parse_argv(argc, argv); } else if (strstr(program_invocation_short_name, "reboot")) { arg_action = ACTION_REBOOT; return halt_parse_argv(argc, argv); } else if (strstr(program_invocation_short_name, "shutdown")) { arg_action = ACTION_POWEROFF; return shutdown_parse_argv(argc, argv); } else if (strstr(program_invocation_short_name, "init")) { arg_action = ACTION_INVALID; return telinit_parse_argv(argc, argv); } else if (strstr(program_invocation_short_name, "runlevel")) { arg_action = ACTION_RUNLEVEL; return runlevel_parse_argv(argc, argv); } } arg_action = ACTION_SYSTEMCTL; return systemctl_parse_argv(argc, argv); } static int talk_upstart(DBusConnection *bus) { log_error("Talking upstart"); return 0; } static int talk_initctl(void) { log_error("Talking initctl"); return 0; } static int systemctl_main(DBusConnection *bus, int argc, char *argv[]) { static const struct { const char* verb; const enum { MORE, LESS, EQUAL } argc_cmp; const int argc; int (* const dispatch)(DBusConnection *bus, char **args, unsigned n); } verbs[] = { { "list-units", LESS, 1, list_units }, { "list-jobs", EQUAL, 1, list_jobs }, { "clear-jobs", EQUAL, 1, clear_jobs }, { "load", MORE, 2, load_unit }, { "cancel", MORE, 2, cancel_job }, { "start", MORE, 2, start_unit }, { "stop", MORE, 2, start_unit }, { "reload", MORE, 2, start_unit }, { "restart", MORE, 2, start_unit }, { "isolate", EQUAL, 2, start_unit }, { "monitor", EQUAL, 1, monitor }, { "dump", EQUAL, 1, dump }, { "snapshot", LESS, 2, snapshot }, { "daemon-reload", EQUAL, 1, clear_jobs }, { "daemon-reexec", EQUAL, 1, clear_jobs }, { "daemon-exit", EQUAL, 1, clear_jobs }, { "show-environment", EQUAL, 1, show_enviroment }, { "set-environment", MORE, 2, set_environment }, { "unset-environment", MORE, 2, set_environment }, { "halt", EQUAL, 1, start_special }, { "poweroff", EQUAL, 1, start_special }, { "reboot", EQUAL, 1, start_special }, { "default", EQUAL, 1, start_special }, { "rescue", EQUAL, 1, start_special }, { "emergency", EQUAL, 1, start_special }, }; int left; unsigned i; assert(bus); assert(argc >= 0); assert(argv); left = argc - optind; if (left <= 0) /* Special rule: no arguments means "list-units" */ i = 0; else { for (i = 0; i < ELEMENTSOF(verbs); i++) if (streq(argv[optind], verbs[i].verb)) break; if (i >= ELEMENTSOF(verbs)) { log_error("Unknown operation %s", argv[optind]); return -EINVAL; } } switch (verbs[i].argc_cmp) { case EQUAL: if (left != verbs[i].argc) { log_error("Invalid number of arguments."); return -EINVAL; } break; case MORE: if (left < verbs[i].argc) { log_error("Too few arguments."); return -EINVAL; } break; case LESS: if (left > verbs[i].argc) { log_error("Too many arguments."); return -EINVAL; } break; default: assert_not_reached("Unknown comparison operator."); } return verbs[i].dispatch(bus, argv + optind, left); } static int reload_with_fallback(DBusConnection *bus) { int r; if (bus) { /* First, try systemd via D-Bus. */ if ((r = clear_jobs(bus, NULL, 0)) > 0) return 0; } /* Nothing else worked, so let's try signals */ assert(arg_action == ACTION_RELOAD || arg_action == ACTION_REEXEC); if (kill(1, arg_action == ACTION_RELOAD ? SIGHUP : SIGTERM) < 0) { log_error("kill() failed: %m"); return -errno; } return 0; } static int start_with_fallback(DBusConnection *bus) { int r; warn_wall(arg_action); if (bus) { /* First, try systemd via D-Bus. */ if ((r = start_unit(bus, NULL, 0)) > 0) return 0; /* Hmm, talking to systemd via D-Bus didn't work. Then * let's try to talk to Upstart via D-Bus. */ if ((r = talk_upstart(bus)) > 0) return 0; } /* Nothing else worked, so let's try * /dev/initctl */ return talk_initctl(); } static int halt_main(DBusConnection *bus) { int r; if (!arg_immediate) return start_with_fallback(bus); if (!arg_no_wtmp) if ((r = utmp_put_shutdown(0)) < 0) log_warning("Failed to write utmp record: %s", strerror(-r)); if (!arg_no_sync) sync(); if (arg_dry) return 0; /* Make sure C-A-D is handled by the kernel from this * point on... */ reboot(RB_ENABLE_CAD); switch (arg_action) { case ACTION_HALT: log_info("Halting"); reboot(RB_HALT_SYSTEM); break; case ACTION_POWEROFF: log_info("Powering off"); reboot(RB_POWER_OFF); break; case ACTION_REBOOT: log_info("Rebooting"); reboot(RB_AUTOBOOT); break; default: assert_not_reached("Unknown halt action."); } /* We should never reach this. */ return -ENOSYS; } static int runlevel_main(void) { int r, runlevel, previous; if ((r = utmp_get_runlevel(&runlevel, &previous)) < 0) { printf("unknown"); return r; } printf("%c %c\n", previous <= 0 ? 'N' : previous, runlevel <= 0 ? 'N' : runlevel); return 0; } int main(int argc, char*argv[]) { int r, retval = 1; DBusConnection *bus = NULL; DBusError error; dbus_error_init(&error); log_parse_environment(); if ((r = parse_argv(argc, argv)) < 0) goto finish; else if (r == 0) { retval = 0; goto finish; } /* /sbin/runlevel doesn't need to communicate via D-Bus, so * let's shortcut this */ if (arg_action == ACTION_RUNLEVEL) { retval = runlevel_main() < 0; goto finish; } if ((bus = dbus_bus_get(arg_session ? DBUS_BUS_SESSION : DBUS_BUS_SYSTEM, &error))) dbus_connection_set_exit_on_disconnect(bus, FALSE); switch (arg_action) { case ACTION_SYSTEMCTL: { if (!bus) { log_error("Failed to get D-Bus connection: %s", error.message); goto finish; } retval = systemctl_main(bus, argc, argv) < 0; break; } case ACTION_HALT: case ACTION_POWEROFF: case ACTION_REBOOT: retval = halt_main(bus) < 0; break; case ACTION_RUNLEVEL2: case ACTION_RUNLEVEL3: case ACTION_RUNLEVEL4: case ACTION_RUNLEVEL5: case ACTION_RESCUE: case ACTION_EMERGENCY: retval = start_with_fallback(bus) < 0; break; case ACTION_RELOAD: case ACTION_REEXEC: retval = reload_with_fallback(bus) < 0; break; default: assert_not_reached("Unknown action"); } finish: if (bus) dbus_connection_unref(bus); dbus_error_free(&error); dbus_shutdown(); return retval; }