src/login/inhibit.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 <getopt.h>
  23 #include <assert.h>
  24 #include <stdlib.h>
  25 #include <stdio.h>
  26 #include <dbus.h>
  27 #include <unistd.h>
  28
  29 #include "dbus-common.h"
  30 #include "util.h"
  31 #include "build.h"
  32 #include "strv.h"
  33
  34 static const char* arg_what = "idle:sleep:shutdown";
  35 static const char* arg_who = NULL;
  36 static const char* arg_why = "Unknown reason";
  37 static const char* arg_mode = "block";
  38
  39 static enum {
  40         ACTION_INHIBIT,
  41         ACTION_LIST
  42 } arg_action = ACTION_INHIBIT;
  43
  44 static int inhibit(DBusConnection *bus, DBusError *error) {
  45         _cleanup_dbus_message_unref_ DBusMessage *reply = NULL;
  46         int r;
  47
  48         r = bus_method_call_with_reply(
  49                         bus,
  50                         "org.freedesktop.login1",
  51                         "/org/freedesktop/login1",
  52                         "org.freedesktop.login1.Manager",
  53                         "Inhibit",
  54                         &reply,
  55                         NULL,
  56                         DBUS_TYPE_STRING, &arg_what,
  57                         DBUS_TYPE_STRING, &arg_who,
  58                         DBUS_TYPE_STRING, &arg_why,
  59                         DBUS_TYPE_STRING, &arg_mode,
  60                         DBUS_TYPE_INVALID);
  61         if (r < 0)
  62                 return r;
  63
  64         if (!dbus_message_get_args(reply, error,
  65                                    DBUS_TYPE_UNIX_FD, &r,
  66                                    DBUS_TYPE_INVALID))
  67                 return -EIO;
  68
  69         return r;
  70 }
  71
  72 static int print_inhibitors(DBusConnection *bus, DBusError *error) {
  73         _cleanup_dbus_message_unref_ DBusMessage *reply = NULL;
  74         unsigned n = 0;
  75         DBusMessageIter iter, sub, sub2;
  76         int r;
  77
  78         r = bus_method_call_with_reply(
  79                         bus,
  80                         "org.freedesktop.login1",
  81                         "/org/freedesktop/login1",
  82                         "org.freedesktop.login1.Manager",
  83                         "ListInhibitors",
  84                         &reply,
  85                         NULL,
  86                         DBUS_TYPE_INVALID);
  87         if (r < 0)
  88                 return r;
  89
  90         if (!dbus_message_iter_init(reply, &iter))
  91                 return -ENOMEM;
  92
  93         if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY)
  94                 return -EIO;
  95
  96         dbus_message_iter_recurse(&iter, &sub);
  97         while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
  98                 const char *what, *who, *why, *mode;
  99                 dbus_uint32_t uid, pid;
 100
 101                 if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_STRUCT)
 102                         return -EIO;
 103
 104                 dbus_message_iter_recurse(&sub, &sub2);
 105
 106                 if (bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &what, true) < 0 ||
 107                     bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &who, true) < 0 ||
 108                     bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &why, true) < 0 ||
 109                     bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &mode, true) < 0 ||
 110                     bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_UINT32, &uid, true) < 0 ||
 111                     bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_UINT32, &pid, false) < 0)
 112                         return -EIO;
 113
 114                 printf("     Who: %s (UID %lu, PID %lu)\n"
 115                        "    What: %s\n"
 116                        "     Why: %s\n"
 117                        "    Mode: %s\n\n",
 118                        who, (unsigned long) uid, (unsigned long) pid,
 119                        what,
 120                        why,
 121                        mode);
 122
 123                 dbus_message_iter_next(&sub);
 124
 125                 n++;
 126         }
 127
 128         printf("%u inhibitors listed.\n", n);
 129         return 0;
 130 }
 131
 132 static int help(void) {
 133
 134         printf("%s [OPTIONS...] {COMMAND} ...\n\n"
 135                "Execute a process while inhibiting shutdown/sleep/idle.\n\n"
 136                "  -h --help               Show this help\n"
 137                "     --version            Show package version\n"
 138                "     --what=WHAT          Operations to inhibit, colon separated list of:\n"
 139                "                          shutdown, sleep, idle, handle-power-key,\n"
 140                "                          handle-suspend-key, handle-hibernate-key,\n"
 141                "                          handle-lid-switch\n"
 142                "     --who=STRING         A descriptive string who is inhibiting\n"
 143                "     --why=STRING         A descriptive string why is being inhibited\n"
 144                "     --mode=MODE          One of block or delay\n"
 145                "     --list               List active inhibitors\n",
 146                program_invocation_short_name);
 147
 148         return 0;
 149 }
 150
 151 static int parse_argv(int argc, char *argv[]) {
 152
 153         enum {
 154                 ARG_VERSION = 0x100,
 155                 ARG_WHAT,
 156                 ARG_WHO,
 157                 ARG_WHY,
 158                 ARG_MODE,
 159                 ARG_LIST,
 160         };
 161
 162         static const struct option options[] = {
 163                 { "help",         no_argument,       NULL, 'h'              },
 164                 { "version",      no_argument,       NULL, ARG_VERSION      },
 165                 { "what",         required_argument, NULL, ARG_WHAT         },
 166                 { "who",          required_argument, NULL, ARG_WHO          },
 167                 { "why",          required_argument, NULL, ARG_WHY          },
 168                 { "mode",         required_argument, NULL, ARG_MODE         },
 169                 { "list",         no_argument,       NULL, ARG_LIST         },
 170                 { NULL,           0,                 NULL, 0                }
 171         };
 172
 173         int c;
 174
 175         assert(argc >= 0);
 176         assert(argv);
 177
 178         while ((c = getopt_long(argc, argv, "+h", options, NULL)) >= 0) {
 179
 180                 switch (c) {
 181
 182                 case 'h':
 183                         help();
 184                         return 0;
 185
 186                 case ARG_VERSION:
 187                         puts(PACKAGE_STRING);
 188                         puts(SYSTEMD_FEATURES);
 189                         return 0;
 190
 191                 case ARG_WHAT:
 192                         arg_what = optarg;
 193                         break;
 194
 195                 case ARG_WHO:
 196                         arg_who = optarg;
 197                         break;
 198
 199                 case ARG_WHY:
 200                         arg_why = optarg;
 201                         break;
 202
 203                 case ARG_MODE:
 204                         arg_mode = optarg;
 205                         break;
 206
 207                 case ARG_LIST:
 208                         arg_action = ACTION_LIST;
 209                         break;
 210
 211                 default:
 212                         log_error("Unknown option code %c", c);
 213                         return -EINVAL;
 214                 }
 215         }
 216
 217         if (arg_action == ACTION_INHIBIT && argc == 1)
 218                 arg_action = ACTION_LIST;
 219
 220         else if (arg_action == ACTION_INHIBIT && optind >= argc) {
 221                 log_error("Missing command line to execute.");
 222                 return -EINVAL;
 223         }
 224
 225         return 1;
 226 }
 227
 228 int main(int argc, char *argv[]) {
 229         int r, exit_code = 0;
 230         DBusConnection *bus = NULL;
 231         DBusError error;
 232         int _cleanup_close_ fd = -1;
 233
 234         dbus_error_init(&error);
 235
 236         log_parse_environment();
 237         log_open();
 238
 239         r = parse_argv(argc, argv);
 240         if (r <= 0)
 241                 goto finish;
 242
 243         bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
 244         if (!bus) {
 245                 log_error("Failed to connect to bus: %s", bus_error_message(&error));
 246                 r = -EIO;
 247                 goto finish;
 248         }
 249
 250         if (arg_action == ACTION_LIST) {
 251
 252                 r = print_inhibitors(bus, &error);
 253                 if (r < 0) {
 254                         log_error("Failed to list inhibitors: %s", bus_error_message_or_strerror(&error, -r));
 255                         goto finish;
 256                 }
 257
 258         } else {
 259                 char *w = NULL;
 260                 pid_t pid;
 261
 262                 if (!arg_who)
 263                         arg_who = w = strv_join(argv + optind, " ");
 264
 265                 fd = inhibit(bus, &error);
 266                 free(w);
 267
 268                 if (fd < 0) {
 269                         log_error("Failed to inhibit: %s", bus_error_message_or_strerror(&error, -r));
 270                         r = fd;
 271                         goto finish;
 272                 }
 273
 274                 pid = fork();
 275                 if (pid < 0) {
 276                         log_error("Failed to fork: %m");
 277                         r = -errno;
 278                         goto finish;
 279                 }
 280
 281                 if (pid == 0) {
 282                         /* Child */
 283
 284                         close_nointr_nofail(fd);
 285                         close_all_fds(NULL, 0);
 286
 287                         execvp(argv[optind], argv + optind);
 288                         log_error("Failed to execute %s: %m", argv[optind]);
 289                         _exit(EXIT_FAILURE);
 290                 }
 291
 292                 r = wait_for_terminate_and_warn(argv[optind], pid);
 293                 if (r >= 0)
 294                         exit_code = r;
 295         }
 296
 297 finish:
 298         if (bus) {
 299                 dbus_connection_close(bus);
 300                 dbus_connection_unref(bus);
 301         }
 302
 303         dbus_error_free(&error);
 304
 305         return r < 0 ? EXIT_FAILURE : exit_code;
 306 }