src/login/inhibit.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2012 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <fcntl.h>
  21 #include <getopt.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <unistd.h>
  25
  26 #include "sd-bus.h"
  27
  28 #include "alloc-util.h"
  29 #include "bus-error.h"
  30 #include "bus-util.h"
  31 #include "fd-util.h"
  32 #include "formats-util.h"
  33 #include "process-util.h"
  34 #include "signal-util.h"
  35 #include "strv.h"
  36 #include "user-util.h"
  37 #include "util.h"
  38
  39 static const char* arg_what = "idle:sleep:shutdown";
  40 static const char* arg_who = NULL;
  41 static const char* arg_why = "Unknown reason";
  42 static const char* arg_mode = NULL;
  43
  44 static enum {
  45         ACTION_INHIBIT,
  46         ACTION_LIST
  47 } arg_action = ACTION_INHIBIT;
  48
  49 static int inhibit(sd_bus *bus, sd_bus_error *error) {
  50         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
  51         int r;
  52         int fd;
  53
  54         r = sd_bus_call_method(
  55                         bus,
  56                         "org.freedesktop.login1",
  57                         "/org/freedesktop/login1",
  58                         "org.freedesktop.login1.Manager",
  59                         "Inhibit",
  60                         error,
  61                         &reply,
  62                         "ssss", arg_what, arg_who, arg_why, arg_mode);
  63         if (r < 0)
  64                 return r;
  65
  66         r = sd_bus_message_read_basic(reply, SD_BUS_TYPE_UNIX_FD, &fd);
  67         if (r < 0)
  68                 return r;
  69
  70         r = fcntl(fd, F_DUPFD_CLOEXEC, 3);
  71         if (r < 0)
  72                 return -errno;
  73
  74         return r;
  75 }
  76
  77 static int print_inhibitors(sd_bus *bus, sd_bus_error *error) {
  78         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
  79         const char *what, *who, *why, *mode;
  80         unsigned int uid, pid;
  81         unsigned n = 0;
  82         int r;
  83
  84         r = sd_bus_call_method(
  85                         bus,
  86                         "org.freedesktop.login1",
  87                         "/org/freedesktop/login1",
  88                         "org.freedesktop.login1.Manager",
  89                         "ListInhibitors",
  90                         error,
  91                         &reply,
  92                         "");
  93         if (r < 0)
  94                 return r;
  95
  96         r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "(ssssuu)");
  97         if (r < 0)
  98                 return bus_log_parse_error(r);
  99
 100         while ((r = sd_bus_message_read(reply, "(ssssuu)", &what, &who, &why, &mode, &uid, &pid)) > 0) {
 101                 _cleanup_free_ char *comm = NULL, *u = NULL;
 102
 103                 if (arg_mode && !streq(mode, arg_mode))
 104                         continue;
 105
 106                 get_process_comm(pid, &comm);
 107                 u = uid_to_name(uid);
 108
 109                 printf("     Who: %s (UID "UID_FMT"/%s, PID "PID_FMT"/%s)\n"
 110                        "    What: %s\n"
 111                        "     Why: %s\n"
 112                        "    Mode: %s\n\n",
 113                        who, uid, strna(u), pid, strna(comm),
 114                        what,
 115                        why,
 116                        mode);
 117
 118                 n++;
 119         }
 120         if (r < 0)
 121                 return bus_log_parse_error(r);
 122
 123         r = sd_bus_message_exit_container(reply);
 124         if (r < 0)
 125                 return bus_log_parse_error(r);
 126
 127         printf("%u inhibitors listed.\n", n);
 128         return 0;
 129 }
 130
 131 static void help(void) {
 132         printf("%s [OPTIONS...] {COMMAND} ...\n\n"
 133                "Execute a process while inhibiting shutdown/sleep/idle.\n\n"
 134                "  -h --help               Show this help\n"
 135                "     --version            Show package version\n"
 136                "     --what=WHAT          Operations to inhibit, colon separated list of:\n"
 137                "                          shutdown, sleep, idle, handle-power-key,\n"
 138                "                          handle-suspend-key, handle-hibernate-key,\n"
 139                "                          handle-lid-switch\n"
 140                "     --who=STRING         A descriptive string who is inhibiting\n"
 141                "     --why=STRING         A descriptive string why is being inhibited\n"
 142                "     --mode=MODE          One of block or delay\n"
 143                "     --list               List active inhibitors\n"
 144                , program_invocation_short_name);
 145 }
 146
 147 static int parse_argv(int argc, char *argv[]) {
 148
 149         enum {
 150                 ARG_VERSION = 0x100,
 151                 ARG_WHAT,
 152                 ARG_WHO,
 153                 ARG_WHY,
 154                 ARG_MODE,
 155                 ARG_LIST,
 156         };
 157
 158         static const struct option options[] = {
 159                 { "help",         no_argument,       NULL, 'h'              },
 160                 { "version",      no_argument,       NULL, ARG_VERSION      },
 161                 { "what",         required_argument, NULL, ARG_WHAT         },
 162                 { "who",          required_argument, NULL, ARG_WHO          },
 163                 { "why",          required_argument, NULL, ARG_WHY          },
 164                 { "mode",         required_argument, NULL, ARG_MODE         },
 165                 { "list",         no_argument,       NULL, ARG_LIST         },
 166                 {}
 167         };
 168
 169         int c;
 170
 171         assert(argc >= 0);
 172         assert(argv);
 173
 174         while ((c = getopt_long(argc, argv, "+h", options, NULL)) >= 0)
 175
 176                 switch (c) {
 177
 178                 case 'h':
 179                         help();
 180                         return 0;
 181
 182                 case ARG_VERSION:
 183                         return version();
 184
 185                 case ARG_WHAT:
 186                         arg_what = optarg;
 187                         break;
 188
 189                 case ARG_WHO:
 190                         arg_who = optarg;
 191                         break;
 192
 193                 case ARG_WHY:
 194                         arg_why = optarg;
 195                         break;
 196
 197                 case ARG_MODE:
 198                         arg_mode = optarg;
 199                         break;
 200
 201                 case ARG_LIST:
 202                         arg_action = ACTION_LIST;
 203                         break;
 204
 205                 case '?':
 206                         return -EINVAL;
 207
 208                 default:
 209                         assert_not_reached("Unhandled option");
 210                 }
 211
 212         if (arg_action == ACTION_INHIBIT && optind == argc)
 213                 arg_action = ACTION_LIST;
 214
 215         else if (arg_action == ACTION_INHIBIT && optind >= argc) {
 216                 log_error("Missing command line to execute.");
 217                 return -EINVAL;
 218         }
 219
 220         return 1;
 221 }
 222
 223 int main(int argc, char *argv[]) {
 224         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 225         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
 226         int r;
 227
 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 }