src/sleep/sleep.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   Copyright 2013 Zbigniew Jędrzejewski-Szmek
   8
   9   systemd is free software; you can redistribute it and/or modify it
  10   under the terms of the GNU Lesser General Public License as published by
  11   the Free Software Foundation; either version 2.1 of the License, or
  12   (at your option) any later version.
  13
  14   systemd is distributed in the hope that it will be useful, but
  15   WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17   Lesser General Public License for more details.
  18
  19   You should have received a copy of the GNU Lesser General Public License
  20   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  21 ***/
  22
  23 #include <errno.h>
  24 #include <getopt.h>
  25 #include <stdio.h>
  26
  27 #include "sd-messages.h"
  28
  29 #include "def.h"
  30 #include "fileio.h"
  31 #include "log.h"
  32 #include "sleep-config.h"
  33 #include "strv.h"
  34 #include "util.h"
  35
  36 static char* arg_verb = NULL;
  37
  38 static int write_mode(char **modes) {
  39         int r = 0;
  40         char **mode;
  41
  42         STRV_FOREACH(mode, modes) {
  43                 int k;
  44
  45                 k = write_string_file("/sys/power/disk", *mode, 0);
  46                 if (k == 0)
  47                         return 0;
  48
  49                 log_debug_errno(k, "Failed to write '%s' to /sys/power/disk: %m",
  50                                 *mode);
  51                 if (r == 0)
  52                         r = k;
  53         }
  54
  55         if (r < 0)
  56                 log_error_errno(r, "Failed to write mode to /sys/power/disk: %m");
  57
  58         return r;
  59 }
  60
  61 static int write_state(FILE **f, char **states) {
  62         char **state;
  63         int r = 0;
  64
  65         STRV_FOREACH(state, states) {
  66                 int k;
  67
  68                 k = write_string_stream(*f, *state, true);
  69                 if (k == 0)
  70                         return 0;
  71                 log_debug_errno(k, "Failed to write '%s' to /sys/power/state: %m",
  72                                 *state);
  73                 if (r == 0)
  74                         r = k;
  75
  76                 fclose(*f);
  77                 *f = fopen("/sys/power/state", "we");
  78                 if (!*f)
  79                         return log_error_errno(errno, "Failed to open /sys/power/state: %m");
  80         }
  81
  82         return r;
  83 }
  84
  85 static int execute(char **modes, char **states) {
  86
  87         char *arguments[] = {
  88                 NULL,
  89                 (char*) "pre",
  90                 arg_verb,
  91                 NULL
  92         };
  93         static const char* const dirs[] = {SYSTEM_SLEEP_PATH, NULL};
  94
  95         int r;
  96         _cleanup_fclose_ FILE *f = NULL;
  97
  98         /* This file is opened first, so that if we hit an error,
  99          * we can abort before modifying any state. */
 100         f = fopen("/sys/power/state", "we");
 101         if (!f)
 102                 return log_error_errno(errno, "Failed to open /sys/power/state: %m");
 103
 104         /* Configure the hibernation mode */
 105         r = write_mode(modes);
 106         if (r < 0)
 107                 return r;
 108
 109         execute_directories(dirs, DEFAULT_TIMEOUT_USEC, arguments);
 110
 111         log_struct(LOG_INFO,
 112                    LOG_MESSAGE_ID(SD_MESSAGE_SLEEP_START),
 113                    LOG_MESSAGE("Suspending system..."),
 114                    "SLEEP=%s", arg_verb,
 115                    NULL);
 116
 117         r = write_state(&f, states);
 118         if (r < 0)
 119                 return r;
 120
 121         log_struct(LOG_INFO,
 122                    LOG_MESSAGE_ID(SD_MESSAGE_SLEEP_STOP),
 123                    LOG_MESSAGE("System resumed."),
 124                    "SLEEP=%s", arg_verb,
 125                    NULL);
 126
 127         arguments[1] = (char*) "post";
 128         execute_directories(dirs, DEFAULT_TIMEOUT_USEC, arguments);
 129
 130         return r;
 131 }
 132
 133 static void help(void) {
 134         printf("%s COMMAND\n\n"
 135                "Suspend the system, hibernate the system, or both.\n\n"
 136                "Commands:\n"
 137                "  -h --help            Show this help and exit\n"
 138                "  --version            Print version string and exit\n"
 139                "  suspend              Suspend the system\n"
 140                "  hibernate            Hibernate the system\n"
 141                "  hybrid-sleep         Both hibernate and suspend the system\n"
 142                , program_invocation_short_name);
 143 }
 144
 145 static int parse_argv(int argc, char *argv[]) {
 146         enum {
 147                 ARG_VERSION = 0x100,
 148         };
 149
 150         static const struct option options[] = {
 151                 { "help",         no_argument,       NULL, 'h'           },
 152                 { "version",      no_argument,       NULL, ARG_VERSION   },
 153                 {}
 154         };
 155
 156         int c;
 157
 158         assert(argc >= 0);
 159         assert(argv);
 160
 161         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
 162                 switch(c) {
 163                 case 'h':
 164                         help();
 165                         return 0; /* done */
 166
 167                 case ARG_VERSION:
 168                         return version();
 169
 170                 case '?':
 171                         return -EINVAL;
 172
 173                 default:
 174                         assert_not_reached("Unhandled option");
 175                 }
 176
 177         if (argc - optind != 1) {
 178                 log_error("Usage: %s COMMAND",
 179                           program_invocation_short_name);
 180                 return -EINVAL;
 181         }
 182
 183         arg_verb = argv[optind];
 184
 185         if (!streq(arg_verb, "suspend") &&
 186             !streq(arg_verb, "hibernate") &&
 187             !streq(arg_verb, "hybrid-sleep")) {
 188                 log_error("Unknown command '%s'.", arg_verb);
 189                 return -EINVAL;
 190         }
 191
 192         return 1 /* work to do */;
 193 }
 194
 195 int main(int argc, char *argv[]) {
 196         _cleanup_strv_free_ char **modes = NULL, **states = NULL;
 197         int r;
 198
 199         log_set_target(LOG_TARGET_AUTO);
 200         log_parse_environment();
 201         log_open();
 202
 203         r = parse_argv(argc, argv);
 204         if (r <= 0)
 205                 goto finish;
 206
 207         r = parse_sleep_config(arg_verb, &modes, &states);
 208         if (r < 0)
 209                 goto finish;
 210
 211         r = execute(modes, states);
 212
 213 finish:
 214         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 215 }