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 = NULL;
  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 r;
  66
  67         r = fcntl(fd, F_DUPFD_CLOEXEC, 3);
  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 bus_log_parse_error(r);
  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                 if (arg_mode && !streq(mode, arg_mode))
 101                         continue;
 102
 103                 get_process_comm(pid, &comm);
 104                 u = uid_to_name(uid);
 105
 106                 printf("     Who: %s (UID "UID_FMT"/%s, PID "PID_FMT"/%s)\n"
 107                        "    What: %s\n"
 108                        "     Why: %s\n"
 109                        "    Mode: %s\n\n",
 110                        who, uid, strna(u), pid, strna(comm),
 111                        what,
 112                        why,
 113                        mode);
 114
 115                 n++;
 116         }
 117         if (r < 0)
 118                 return bus_log_parse_error(r);
 119
 120         r = sd_bus_message_exit_container(reply);
 121         if (r < 0)
 122                 return bus_log_parse_error(r);
 123
 124         printf("%u inhibitors listed.\n", n);
 125         return 0;
 126 }
 127
 128 static void help(void) {
 129         printf("%s [OPTIONS...] {COMMAND} ...\n\n"
 130                "Execute a process while inhibiting shutdown/sleep/idle.\n\n"
 131                "  -h --help               Show this help\n"
 132                "     --version            Show package version\n"
 133                "     --what=WHAT          Operations to inhibit, colon separated list of:\n"
 134                "                          shutdown, sleep, idle, handle-power-key,\n"
 135                "                          handle-suspend-key, handle-hibernate-key,\n"
 136                "                          handle-lid-switch\n"
 137                "     --who=STRING         A descriptive string who is inhibiting\n"
 138                "     --why=STRING         A descriptive string why is being inhibited\n"
 139                "     --mode=MODE          One of block or delay\n"
 140                "     --list               List active inhibitors\n"
 141                , program_invocation_short_name);
 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                         help();
 177                         return 0;
 178
 179                 case ARG_VERSION:
 180                         puts(PACKAGE_STRING);
 181                         puts(SYSTEMD_FEATURES);
 182                         return 0;
 183
 184                 case ARG_WHAT:
 185                         arg_what = optarg;
 186                         break;
 187
 188                 case ARG_WHO:
 189                         arg_who = optarg;
 190                         break;
 191
 192                 case ARG_WHY:
 193                         arg_why = optarg;
 194                         break;
 195
 196                 case ARG_MODE:
 197                         arg_mode = optarg;
 198                         break;
 199
 200                 case ARG_LIST:
 201                         arg_action = ACTION_LIST;
 202                         break;
 203
 204                 case '?':
 205                         return -EINVAL;
 206
 207                 default:
 208                         assert_not_reached("Unhandled option");
 209                 }
 210
 211         if (arg_action == ACTION_INHIBIT && optind == argc)
 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_close_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_default_system(&bus);
 237         if (r < 0) {
 238                 log_error_errno(r, "Failed to connect to bus: %m");
 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                 if (!arg_mode)
 259                         arg_mode = "block";
 260
 261                 fd = inhibit(bus, &error);
 262                 if (fd < 0) {
 263                         log_error("Failed to inhibit: %s", bus_error_message(&error, -r));
 264                         return EXIT_FAILURE;
 265                 }
 266
 267                 pid = fork();
 268                 if (pid < 0) {
 269                         log_error_errno(errno, "Failed to fork: %m");
 270                         return EXIT_FAILURE;
 271                 }
 272
 273                 if (pid == 0) {
 274                         /* Child */
 275
 276                         close_all_fds(NULL, 0);
 277
 278                         execvp(argv[optind], argv + optind);
 279                         log_error_errno(errno, "Failed to execute %s: %m", argv[optind]);
 280                         _exit(EXIT_FAILURE);
 281                 }
 282
 283                 r = wait_for_terminate_and_warn(argv[optind], pid, true);
 284                 return r < 0 ? EXIT_FAILURE : r;
 285         }
 286
 287         return 0;
 288 }