src/login/logind-action.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2012 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <unistd.h>
  23
  24 #include <systemd/sd-messages.h>
  25
  26 #include "conf-parser.h"
  27 #include "special.h"
  28 #include "dbus-common.h"
  29 #include "logind-action.h"
  30
  31 int manager_handle_action(
  32                 Manager *m,
  33                 InhibitWhat inhibit_key,
  34                 HandleAction handle,
  35                 bool ignore_inhibited,
  36                 bool is_edge) {
  37
  38         static const char * const message_table[_HANDLE_ACTION_MAX] = {
  39                 [HANDLE_POWEROFF] = "Powering Off...",
  40                 [HANDLE_REBOOT] = "Rebooting...",
  41                 [HANDLE_HALT] = "Halting...",
  42                 [HANDLE_KEXEC] = "Rebooting via kexec...",
  43                 [HANDLE_SUSPEND] = "Suspending...",
  44                 [HANDLE_HIBERNATE] = "Hibernating...",
  45                 [HANDLE_HYBRID_SLEEP] = "Hibernating and suspending..."
  46         };
  47
  48         static const char * const target_table[_HANDLE_ACTION_MAX] = {
  49                 [HANDLE_POWEROFF] = SPECIAL_POWEROFF_TARGET,
  50                 [HANDLE_REBOOT] = SPECIAL_REBOOT_TARGET,
  51                 [HANDLE_HALT] = SPECIAL_HALT_TARGET,
  52                 [HANDLE_KEXEC] = SPECIAL_KEXEC_TARGET,
  53                 [HANDLE_SUSPEND] = SPECIAL_SUSPEND_TARGET,
  54                 [HANDLE_HIBERNATE] = SPECIAL_HIBERNATE_TARGET,
  55                 [HANDLE_HYBRID_SLEEP] = SPECIAL_HYBRID_SLEEP_TARGET
  56         };
  57
  58         DBusError error;
  59         int r;
  60         InhibitWhat inhibit_operation;
  61         bool supported;
  62
  63         assert(m);
  64
  65         if (m->action_what) {
  66                 log_debug("Action already in progress, ignoring.");
  67                 return -EALREADY;
  68         }
  69
  70         /* If the key handling is turned off, don't do anything */
  71         if (handle == HANDLE_IGNORE) {
  72                 log_debug("Refusing operation, as it is turned off.");
  73                 return 0;
  74         }
  75
  76         if (handle == HANDLE_SUSPEND)
  77                 supported = can_sleep("mem") > 0;
  78         else if (handle == HANDLE_HIBERNATE)
  79                 supported = can_sleep("disk") > 0;
  80         else if (handle == HANDLE_HYBRID_SLEEP)
  81                 supported = can_sleep("disk") > 0 && can_sleep_disk("suspend") > 0;
  82         else if (handle == HANDLE_KEXEC)
  83                 supported = access("/sbin/kexec", X_OK) >= 0;
  84         else
  85                 supported = true;
  86
  87         if (!supported) {
  88                 log_warning("Requested operation not supported, ignoring.");
  89                 return -ENOTSUP;
  90         }
  91
  92         /* If the key handling is inhibited, don't do anything */
  93         if (inhibit_key > 0) {
  94                 if (manager_is_inhibited(m, inhibit_key, INHIBIT_BLOCK, NULL, true, false, 0)) {
  95                         log_debug("Refusing operation, %s is inhibited.", inhibit_what_to_string(inhibit_key));
  96                         return 0;
  97                 }
  98         }
  99
 100         /* Locking is handled differently from the rest. */
 101         if (handle == HANDLE_LOCK) {
 102                 log_info("Locking sessions...");
 103                 session_send_lock_all(m, true);
 104                 return 1;
 105         }
 106
 107         inhibit_operation = handle == HANDLE_SUSPEND || handle == HANDLE_HIBERNATE || handle == HANDLE_HYBRID_SLEEP ? INHIBIT_SLEEP : INHIBIT_SHUTDOWN;
 108
 109         /* If the actual operation is inhibited, warn and fail */
 110         if (!ignore_inhibited &&
 111             manager_is_inhibited(m, inhibit_operation, INHIBIT_BLOCK, NULL, false, false, 0)) {
 112
 113                 /* If this is just a recheck of the lid switch then don't warn about anything */
 114                 if (!is_edge) {
 115                         log_debug("Refusing operation, %s is inhibited.", inhibit_what_to_string(inhibit_operation));
 116                         return 0;
 117                 }
 118
 119                 log_error("Refusing operation, %s is inhibited.", inhibit_what_to_string(inhibit_operation));
 120                 warn_melody();
 121                 return -EPERM;
 122         }
 123
 124         log_info("%s", message_table[handle]);
 125
 126         dbus_error_init(&error);
 127         r = bus_manager_shutdown_or_sleep_now_or_later(m, target_table[handle], inhibit_operation, &error);
 128         if (r < 0) {
 129                 log_error("Failed to execute operation: %s", bus_error_message(&error));
 130                 dbus_error_free(&error);
 131                 return r;
 132         }
 133
 134         return 1;
 135 }
 136
 137 static const char* const handle_action_table[_HANDLE_ACTION_MAX] = {
 138         [HANDLE_IGNORE] = "ignore",
 139         [HANDLE_POWEROFF] = "poweroff",
 140         [HANDLE_REBOOT] = "reboot",
 141         [HANDLE_HALT] = "halt",
 142         [HANDLE_KEXEC] = "kexec",
 143         [HANDLE_SUSPEND] = "suspend",
 144         [HANDLE_HIBERNATE] = "hibernate",
 145         [HANDLE_HYBRID_SLEEP] = "hybrid-sleep",
 146         [HANDLE_LOCK] = "lock"
 147 };
 148
 149 DEFINE_STRING_TABLE_LOOKUP(handle_action, HandleAction);
 150 DEFINE_CONFIG_PARSE_ENUM(config_parse_handle_action, handle_action, HandleAction, "Failed to parse handle action setting");