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