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 <stdlib.h>
  24 #include <stdio.h>
  25 #include <unistd.h>
  26 #include <fcntl.h>
  27
  28 #include "sd-bus.h"
  29 #include "bus-util.h"
  30 #include "bus-error.h"
  31 #include "util.h"
  32 #include "build.h"
  33 #include "strv.h"
  34 #include "formats-util.h"
  35 #include "process-util.h"
  36 #include "signal-util.h"
  37
  38 static const char* arg_what = "idle:sleep:shutdown";
  39 static const char* arg_who = NULL;
  40 static const char* arg_why = "Unknown reason";
  41 static const char* arg_mode = NULL;
  42
  43 static enum {
  44         ACTION_INHIBIT,
  45         ACTION_LIST
  46 } arg_action = ACTION_INHIBIT;
  47
  48 static int inhibit(sd_bus *bus, sd_bus_error *error) {
  49         _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
  50         int r;
  51         int fd;
  52
  53         r = sd_bus_call_method(
  54                         bus,
  55                         "org.freedesktop.login1",
  56                         "/org/freedesktop/login1",
  57                         "org.freedesktop.login1.Manager",
  58                         "Inhibit",
  59                         error,
  60                         &reply,
  61                         "ssss", arg_what, arg_who, arg_why, arg_mode);
  62         if (r < 0)
  63                 return r;
  64
  65         r = sd_bus_message_read_basic(reply, SD_BUS_TYPE_UNIX_FD, &fd);
  66         if (r < 0)
  67                 return r;
  68
  69         r = fcntl(fd, F_DUPFD_CLOEXEC, 3);
  70         if (r < 0)
  71                 return -errno;
  72
  73         return r;
  74 }
  75
  76 static int print_inhibitors(sd_bus *bus, sd_bus_error *error) {
  77         _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
  78         const char *what, *who, *why, *mode;
  79         unsigned int uid, pid;
  80         unsigned n = 0;
  81         int r;
  82
  83         r = sd_bus_call_method(
  84                         bus,
  85                         "org.freedesktop.login1",
  86                         "/org/freedesktop/login1",
  87                         "org.freedesktop.login1.Manager",
  88                         "ListInhibitors",
  89                         error,
  90                         &reply,
  91                         "");
  92         if (r < 0)
  93                 return r;
  94
  95         r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "(ssssuu)");
  96         if (r < 0)
  97                 return bus_log_parse_error(r);
  98
  99         while ((r = sd_bus_message_read(reply, "(ssssuu)", &what, &who, &why, &mode, &uid, &pid)) > 0) {
 100                 _cleanup_free_ char *comm = NULL, *u = NULL;
 101
 102                 if (arg_mode && !streq(mode, arg_mode))
 103                         continue;
 104
 105                 get_process_comm(pid, &comm);
 106                 u = uid_to_name(uid);
 107
 108                 printf("     Who: %s (UID "UID_FMT"/%s, PID "PID_FMT"/%s)\n"
 109                        "    What: %s\n"
 110                        "     Why: %s\n"
 111                        "    Mode: %s\n\n",
 112                        who, uid, strna(u), pid, strna(comm),
 113                        what,
 114                        why,
 115                        mode);
 116
 117                 n++;
 118         }
 119         if (r < 0)
 120                 return bus_log_parse_error(r);
 121
 122         r = sd_bus_message_exit_container(reply);
 123         if (r < 0)
 124                 return bus_log_parse_error(r);
 125
 126         printf("%u inhibitors listed.\n", n);
 127         return 0;
 128 }
 129
 130 static void help(void) {
 131         printf("%s [OPTIONS...] {COMMAND} ...\n\n"
 132                "Execute a process while inhibiting shutdown/sleep/idle.\n\n"
 133                "  -h --help               Show this help\n"
 134                "     --version            Show package version\n"
 135                "     --what=WHAT          Operations to inhibit, colon separated list of:\n"
 136                "                          shutdown, sleep, idle, handle-power-key,\n"
 137                "                          handle-suspend-key, handle-hibernate-key,\n"
 138                "                          handle-lid-switch\n"
 139                "     --who=STRING         A descriptive string who is inhibiting\n"
 140                "     --why=STRING         A descriptive string why is being inhibited\n"
 141                "     --mode=MODE          One of block or delay\n"
 142                "     --list               List active inhibitors\n"
 143                , program_invocation_short_name);
 144 }
 145
 146 static int parse_argv(int argc, char *argv[]) {
 147
 148         enum {
 149                 ARG_VERSION = 0x100,
 150                 ARG_WHAT,
 151                 ARG_WHO,
 152                 ARG_WHY,
 153                 ARG_MODE,
 154                 ARG_LIST,
 155         };
 156
 157         static const struct option options[] = {
 158                 { "help",         no_argument,       NULL, 'h'              },
 159                 { "version",      no_argument,       NULL, ARG_VERSION      },
 160                 { "what",         required_argument, NULL, ARG_WHAT         },
 161                 { "who",          required_argument, NULL, ARG_WHO          },
 162                 { "why",          required_argument, NULL, ARG_WHY          },
 163                 { "mode",         required_argument, NULL, ARG_MODE         },
 164                 { "list",         no_argument,       NULL, ARG_LIST         },
 165                 {}
 166         };
 167
 168         int c;
 169
 170         assert(argc >= 0);
 171         assert(argv);
 172
 173         while ((c = getopt_long(argc, argv, "+h", options, NULL)) >= 0)
 174
 175                 switch (c) {
 176
 177                 case 'h':
 178                         help();
 179                         return 0;
 180
 181                 case ARG_VERSION:
 182                         return version();
 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_flush_close_unref_ sd_bus *bus = NULL;
 225         int r;
 226
 227         elogind_set_program_name(argv[0]);
 228         log_parse_environment();
 229         log_open();
 230
 231         r = parse_argv(argc, argv);
 232         if (r < 0)
 233                 return EXIT_FAILURE;
 234         if (r == 0)
 235                 return EXIT_SUCCESS;
 236
 237         r = sd_bus_default_system(&bus);
 238         if (r < 0) {
 239                 log_error_errno(r, "Failed to connect to bus: %m");
 240                 return EXIT_FAILURE;
 241         }
 242
 243         if (arg_action == ACTION_LIST) {
 244
 245                 r = print_inhibitors(bus, &error);
 246                 if (r < 0) {
 247                         log_error("Failed to list inhibitors: %s", bus_error_message(&error, -r));
 248                         return EXIT_FAILURE;
 249                 }
 250
 251         } else {
 252                 _cleanup_close_ int fd = -1;
 253                 _cleanup_free_ char *w = NULL;
 254                 pid_t pid;
 255
 256                 if (!arg_who)
 257                         arg_who = w = strv_join(argv + optind, " ");
 258
 259                 if (!arg_mode)
 260                         arg_mode = "block";
 261
 262                 fd = inhibit(bus, &error);
 263                 if (fd < 0) {
 264                         log_error("Failed to inhibit: %s", bus_error_message(&error, fd));
 265                         return EXIT_FAILURE;
 266                 }
 267
 268                 pid = fork();
 269                 if (pid < 0) {
 270                         log_error_errno(errno, "Failed to fork: %m");
 271                         return EXIT_FAILURE;
 272                 }
 273
 274                 if (pid == 0) {
 275                         /* Child */
 276
 277                         (void) reset_all_signal_handlers();
 278                         (void) reset_signal_mask();
 279
 280                         close_all_fds(NULL, 0);
 281
 282                         execvp(argv[optind], argv + optind);
 283                         log_error_errno(errno, "Failed to execute %s: %m", argv[optind]);
 284                         _exit(EXIT_FAILURE);
 285                 }
 286
 287                 r = wait_for_terminate_and_warn(argv[optind], pid, true);
 288                 return r < 0 ? EXIT_FAILURE : r;
 289         }
 290
 291         return 0;
 292 }