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         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                 r = -EIO;
  68
  69         dbus_message_unref(reply);
  70
  71         return r;
  72 }
  73
  74 static int print_inhibitors(DBusConnection *bus, DBusError *error) {
  75         DBusMessage *reply = NULL;
  76         unsigned n = 0;
  77         DBusMessageIter iter, sub, sub2;
  78         int r;
  79
  80         r = bus_method_call_with_reply(
  81                         bus,
  82                         "org.freedesktop.login1",
  83                         "/org/freedesktop/login1",
  84                         "org.freedesktop.login1.Manager",
  85                         "ListInhibitors",
  86                         &reply,
  87                         NULL,
  88                         DBUS_TYPE_INVALID);
  89         if (r < 0)
  90                 goto finish;
  91
  92         if (!dbus_message_iter_init(reply, &iter)) {
  93                 r = -ENOMEM;
  94                 goto finish;
  95         }
  96
  97         if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY) {
  98                 r = -EIO;
  99                 goto finish;
 100         }
 101
 102         dbus_message_iter_recurse(&iter, &sub);
 103         while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
 104                 const char *what, *who, *why, *mode;
 105                 dbus_uint32_t uid, pid;
 106
 107                 if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_STRUCT) {
 108                         r = -EIO;
 109                         goto finish;
 110                 }
 111
 112                 dbus_message_iter_recurse(&sub, &sub2);
 113
 114                 if (bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &what, true) < 0 ||
 115                     bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &who, true) < 0 ||
 116                     bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &why, true) < 0 ||
 117                     bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &mode, true) < 0 ||
 118                     bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_UINT32, &uid, true) < 0 ||
 119                     bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_UINT32, &pid, false) < 0) {
 120                         r = -EIO;
 121                         goto finish;
 122                 }
 123
 124                 printf("     Who: %s (UID %lu, PID %lu)\n"
 125                        "    What: %s\n"
 126                        "     Why: %s\n"
 127                        "    Mode: %s\n\n",
 128                        who, (unsigned long) uid, (unsigned long) pid,
 129                        what,
 130                        why,
 131                        mode);
 132
 133                 dbus_message_iter_next(&sub);
 134
 135                 n++;
 136         }
 137
 138         printf("%u inhibitors listed.\n", n);
 139         r = 0;
 140
 141 finish:
 142         if (reply)
 143                 dbus_message_unref(reply);
 144
 145         return r;
 146 }
 147
 148 static int help(void) {
 149
 150         printf("%s [OPTIONS...] {COMMAND} ...\n\n"
 151                "Execute a process while inhibiting shutdown/sleep/idle.\n\n"
 152                "  -h --help               Show this help\n"
 153                "     --version            Show package version\n"
 154                "     --what=WHAT          Operations to inhibit, colon separated list of:\n"
 155                "                          shutdown, sleep, idle, handle-power-key,\n"
 156                "                          handle-suspend-key, handle-hibernate-key,\n"
 157                "                          handle-lid-switch\n"
 158                "     --who=STRING         A descriptive string who is inhibiting\n"
 159                "     --why=STRING         A descriptive string why is being inhibited\n"
 160                "     --mode=MODE          One of block or delay\n"
 161                "     --list               List active inhibitors\n",
 162                program_invocation_short_name);
 163
 164         return 0;
 165 }
 166
 167 static int parse_argv(int argc, char *argv[]) {
 168
 169         enum {
 170                 ARG_VERSION = 0x100,
 171                 ARG_WHAT,
 172                 ARG_WHO,
 173                 ARG_WHY,
 174                 ARG_MODE,
 175                 ARG_LIST,
 176         };
 177
 178         static const struct option options[] = {
 179                 { "help",         no_argument,       NULL, 'h'              },
 180                 { "version",      no_argument,       NULL, ARG_VERSION      },
 181                 { "what",         required_argument, NULL, ARG_WHAT         },
 182                 { "who",          required_argument, NULL, ARG_WHO          },
 183                 { "why",          required_argument, NULL, ARG_WHY          },
 184                 { "mode",         required_argument, NULL, ARG_MODE         },
 185                 { "list",         no_argument,       NULL, ARG_LIST         },
 186                 { NULL,           0,                 NULL, 0                }
 187         };
 188
 189         int c;
 190
 191         assert(argc >= 0);
 192         assert(argv);
 193
 194         while ((c = getopt_long(argc, argv, "+h", options, NULL)) >= 0) {
 195
 196                 switch (c) {
 197
 198                 case 'h':
 199                         help();
 200                         return 0;
 201
 202                 case ARG_VERSION:
 203                         puts(PACKAGE_STRING);
 204                         puts(SYSTEMD_FEATURES);
 205                         return 0;
 206
 207                 case ARG_WHAT:
 208                         arg_what = optarg;
 209                         break;
 210
 211                 case ARG_WHO:
 212                         arg_who = optarg;
 213                         break;
 214
 215                 case ARG_WHY:
 216                         arg_why = optarg;
 217                         break;
 218
 219                 case ARG_MODE:
 220                         arg_mode = optarg;
 221                         break;
 222
 223                 case ARG_LIST:
 224                         arg_action = ACTION_LIST;
 225                         break;
 226
 227                 default:
 228                         log_error("Unknown option code %c", c);
 229                         return -EINVAL;
 230                 }
 231         }
 232
 233         if (arg_action == ACTION_INHIBIT && optind >= argc) {
 234                 log_error("Missing command line to execute.");
 235                 return -EINVAL;
 236         }
 237
 238         return 1;
 239 }
 240
 241 int main(int argc, char *argv[]) {
 242         int r, exit_code = 0;
 243         DBusConnection *bus = NULL;
 244         DBusError error;
 245         int fd = -1;
 246
 247         dbus_error_init(&error);
 248
 249         log_parse_environment();
 250         log_open();
 251
 252         r = parse_argv(argc, argv);
 253         if (r <= 0)
 254                 goto finish;
 255
 256         bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
 257         if (!bus) {
 258                 log_error("Failed to connect to bus: %s", bus_error_message(&error));
 259                 r = -EIO;
 260                 goto finish;
 261         }
 262
 263         if (arg_action == ACTION_LIST) {
 264
 265                 r = print_inhibitors(bus, &error);
 266                 if (r < 0) {
 267                         log_error("Failed to list inhibitors: %s", bus_error_message_or_strerror(&error, -r));
 268                         goto finish;
 269                 }
 270
 271         } else {
 272                 char *w = NULL;
 273                 pid_t pid;
 274
 275                 if (!arg_who)
 276                         arg_who = w = strv_join(argv + optind, " ");
 277
 278                 fd = inhibit(bus, &error);
 279                 free(w);
 280
 281                 if (fd < 0) {
 282                         log_error("Failed to inhibit: %s", bus_error_message_or_strerror(&error, -r));
 283                         r = fd;
 284                         goto finish;
 285                 }
 286
 287                 pid = fork();
 288                 if (pid < 0) {
 289                         log_error("Failed to fork: %m");
 290                         r = -errno;
 291                         goto finish;
 292                 }
 293
 294                 if (pid == 0) {
 295                         /* Child */
 296
 297                         close_nointr_nofail(fd);
 298                         close_all_fds(NULL, 0);
 299
 300                         execvp(argv[optind], argv + optind);
 301                         log_error("Failed to execute %s: %m", argv[optind]);
 302                         _exit(EXIT_FAILURE);
 303                 }
 304
 305                 r = wait_for_terminate_and_warn(argv[optind], pid);
 306                 if (r >= 0)
 307                         exit_code = r;
 308         }
 309
 310 finish:
 311         if (bus) {
 312                 dbus_connection_close(bus);
 313                 dbus_connection_unref(bus);
 314         }
 315
 316         dbus_error_free(&error);
 317
 318         if (fd >= 0)
 319                 close_nointr_nofail(fd);
 320
 321         return r < 0 ? EXIT_FAILURE : exit_code;
 322 }