src/sleep/sleep.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2012 Lennart Poettering
   6   Copyright 2013 Zbigniew Jędrzejewski-Szmek
   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 <errno.h>
  23 #include <getopt.h>
  24 #include <stdio.h>
  25
  26 #include "sd-messages.h"
  27
  28 #include "def.h"
  29 #include "exec-util.h"
  30 #include "fd-util.h"
  31 #include "fileio.h"
  32 #include "log.h"
  33 #include "sleep-config.h"
  34 #include "string-util.h"
  35 #include "strv.h"
  36 #include "util.h"
  37
  38 static char* arg_verb = NULL;
  39
  40 static int write_mode(char **modes) {
  41         int r = 0;
  42         char **mode;
  43
  44         STRV_FOREACH(mode, modes) {
  45                 int k;
  46
  47                 k = write_string_file("/sys/power/disk", *mode, 0);
  48                 if (k == 0)
  49                         return 0;
  50
  51                 log_debug_errno(k, "Failed to write '%s' to /sys/power/disk: %m",
  52                                 *mode);
  53                 if (r == 0)
  54                         r = k;
  55         }
  56
  57         if (r < 0)
  58                 log_error_errno(r, "Failed to write mode to /sys/power/disk: %m");
  59
  60         return r;
  61 }
  62
  63 static int write_state(FILE **f, char **states) {
  64         char **state;
  65         int r = 0;
  66
  67         STRV_FOREACH(state, states) {
  68                 int k;
  69
  70                 k = write_string_stream(*f, *state, 0);
  71                 if (k == 0)
  72                         return 0;
  73                 log_debug_errno(k, "Failed to write '%s' to /sys/power/state: %m",
  74                                 *state);
  75                 if (r == 0)
  76                         r = k;
  77
  78                 fclose(*f);
  79                 *f = fopen("/sys/power/state", "we");
  80                 if (!*f)
  81                         return log_error_errno(errno, "Failed to open /sys/power/state: %m");
  82         }
  83
  84         return r;
  85 }
  86
  87 static int execute(char **modes, char **states) {
  88
  89         char *arguments[] = {
  90                 NULL,
  91                 (char*) "pre",
  92                 arg_verb,
  93                 NULL
  94         };
  95         static const char* const dirs[] = {
  96                 SYSTEM_SLEEP_PATH,
  97                 NULL
  98         };
  99
 100         int r;
 101         _cleanup_fclose_ FILE *f = NULL;
 102
 103         /* This file is opened first, so that if we hit an error,
 104          * we can abort before modifying any state. */
 105         f = fopen("/sys/power/state", "we");
 106         if (!f)
 107                 return log_error_errno(errno, "Failed to open /sys/power/state: %m");
 108
 109         /* Configure the hibernation mode */
 110         r = write_mode(modes);
 111         if (r < 0)
 112                 return r;
 113
 114         execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, arguments);
 115
 116         log_struct(LOG_INFO,
 117                    "MESSAGE_ID=" SD_MESSAGE_SLEEP_START_STR,
 118                    LOG_MESSAGE("Suspending system..."),
 119                    "SLEEP=%s", arg_verb,
 120                    NULL);
 121
 122         r = write_state(&f, states);
 123         if (r < 0)
 124                 return r;
 125
 126         log_struct(LOG_INFO,
 127                    "MESSAGE_ID=" SD_MESSAGE_SLEEP_STOP_STR,
 128                    LOG_MESSAGE("System resumed."),
 129                    "SLEEP=%s", arg_verb,
 130                    NULL);
 131
 132         arguments[1] = (char*) "post";
 133         execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, arguments);
 134
 135         return r;
 136 }
 137
 138 static void help(void) {
 139         printf("%s COMMAND\n\n"
 140                "Suspend the system, hibernate the system, or both.\n\n"
 141                "Commands:\n"
 142                "  -h --help            Show this help and exit\n"
 143                "  --version            Print version string and exit\n"
 144                "  suspend              Suspend the system\n"
 145                "  hibernate            Hibernate the system\n"
 146                "  hybrid-sleep         Both hibernate and suspend the system\n"
 147                , program_invocation_short_name);
 148 }
 149
 150 static int parse_argv(int argc, char *argv[]) {
 151         enum {
 152                 ARG_VERSION = 0x100,
 153         };
 154
 155         static const struct option options[] = {
 156                 { "help",         no_argument,       NULL, 'h'           },
 157                 { "version",      no_argument,       NULL, ARG_VERSION   },
 158                 {}
 159         };
 160
 161         int c;
 162
 163         assert(argc >= 0);
 164         assert(argv);
 165
 166         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
 167                 switch(c) {
 168                 case 'h':
 169                         help();
 170                         return 0; /* done */
 171
 172                 case ARG_VERSION:
 173                         return version();
 174
 175                 case '?':
 176                         return -EINVAL;
 177
 178                 default:
 179                         assert_not_reached("Unhandled option");
 180                 }
 181
 182         if (argc - optind != 1) {
 183                 log_error("Usage: %s COMMAND",
 184                           program_invocation_short_name);
 185                 return -EINVAL;
 186         }
 187
 188         arg_verb = argv[optind];
 189
 190         if (!streq(arg_verb, "suspend") &&
 191             !streq(arg_verb, "hibernate") &&
 192             !streq(arg_verb, "hybrid-sleep")) {
 193                 log_error("Unknown command '%s'.", arg_verb);
 194                 return -EINVAL;
 195         }
 196
 197         return 1 /* work to do */;
 198 }
 199
 200 int main(int argc, char *argv[]) {
 201         _cleanup_strv_free_ char **modes = NULL, **states = NULL;
 202         int r;
 203
 204         log_set_target(LOG_TARGET_AUTO);
 205         log_parse_environment();
 206         log_open();
 207
 208         r = parse_argv(argc, argv);
 209         if (r <= 0)
 210                 goto finish;
 211
 212         r = parse_sleep_config(arg_verb, &modes, &states);
 213         if (r < 0)
 214                 goto finish;
 215
 216         r = execute(modes, states);
 217
 218 finish:
 219         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 220 }