src/sleep/sleep.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2012 Lennart Poettering
   5   Copyright 2013 Zbigniew Jędrzejewski-Szmek
   6
   7   systemd is free software; you can redistribute it and/or modify it
   8   under the terms of the GNU Lesser General Public License as published by
   9   the Free Software Foundation; either version 2.1 of the License, or
  10   (at your option) any later version.
  11
  12   systemd is distributed in the hope that it will be useful, but
  13   WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15   Lesser General Public License for more details.
  16
  17   You should have received a copy of the GNU Lesser General Public License
  18   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  19 ***/
  20
  21 #include <errno.h>
  22 #include <getopt.h>
  23 #include <stdio.h>
  24
  25 #include "sd-messages.h"
  26
  27 #include "def.h"
  28 #include "exec-util.h"
  29 #include "fd-util.h"
  30 #include "fileio.h"
  31 #include "log.h"
  32 #include "sleep-config.h"
  33 #include "string-util.h"
  34 #include "strv.h"
  35 #include "util.h"
  36
  37 static char* arg_verb = NULL;
  38
  39 static int write_mode(char **modes) {
  40         int r = 0;
  41         char **mode;
  42
  43         STRV_FOREACH(mode, modes) {
  44                 int k;
  45
  46                 k = write_string_file("/sys/power/disk", *mode, 0);
  47                 if (k == 0)
  48                         return 0;
  49
  50                 log_debug_errno(k, "Failed to write '%s' to /sys/power/disk: %m",
  51                                 *mode);
  52                 if (r == 0)
  53                         r = k;
  54         }
  55
  56         if (r < 0)
  57                 log_error_errno(r, "Failed to write mode to /sys/power/disk: %m");
  58
  59         return r;
  60 }
  61
  62 static int write_state(FILE **f, char **states) {
  63         char **state;
  64         int r = 0;
  65
  66         STRV_FOREACH(state, states) {
  67                 int k;
  68
  69                 k = write_string_stream(*f, *state, true);
  70                 if (k == 0)
  71                         return 0;
  72                 log_debug_errno(k, "Failed to write '%s' to /sys/power/state: %m",
  73                                 *state);
  74                 if (r == 0)
  75                         r = k;
  76
  77                 fclose(*f);
  78                 *f = fopen("/sys/power/state", "we");
  79                 if (!*f)
  80                         return log_error_errno(errno, "Failed to open /sys/power/state: %m");
  81         }
  82
  83         return r;
  84 }
  85
  86 static int execute(char **modes, char **states) {
  87
  88         char *arguments[] = {
  89                 NULL,
  90                 (char*) "pre",
  91                 arg_verb,
  92                 NULL
  93         };
  94         static const char* const dirs[] = {
  95                 SYSTEM_SLEEP_PATH,
  96                 NULL
  97         };
  98
  99         int r;
 100         _cleanup_fclose_ FILE *f = NULL;
 101
 102         /* This file is opened first, so that if we hit an error,
 103          * we can abort before modifying any state. */
 104         f = fopen("/sys/power/state", "we");
 105         if (!f)
 106                 return log_error_errno(errno, "Failed to open /sys/power/state: %m");
 107
 108         /* Configure the hibernation mode */
 109         r = write_mode(modes);
 110         if (r < 0)
 111                 return r;
 112
 113         execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, arguments);
 114
 115         log_struct(LOG_INFO,
 116                    "MESSAGE_ID=" SD_MESSAGE_SLEEP_START_STR,
 117                    LOG_MESSAGE("Suspending system..."),
 118                    "SLEEP=%s", arg_verb,
 119                    NULL);
 120
 121         r = write_state(&f, states);
 122         if (r < 0)
 123                 return r;
 124
 125         log_struct(LOG_INFO,
 126                    "MESSAGE_ID=" SD_MESSAGE_SLEEP_STOP_STR,
 127                    LOG_MESSAGE("System resumed."),
 128                    "SLEEP=%s", arg_verb,
 129                    NULL);
 130
 131         arguments[1] = (char*) "post";
 132         execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, arguments);
 133
 134         return r;
 135 }
 136
 137 static void help(void) {
 138         printf("%s COMMAND\n\n"
 139                "Suspend the system, hibernate the system, or both.\n\n"
 140                "Commands:\n"
 141                "  -h --help            Show this help and exit\n"
 142                "  --version            Print version string and exit\n"
 143                "  suspend              Suspend the system\n"
 144                "  hibernate            Hibernate the system\n"
 145                "  hybrid-sleep         Both hibernate and suspend the system\n"
 146                , program_invocation_short_name);
 147 }
 148
 149 static int parse_argv(int argc, char *argv[]) {
 150         enum {
 151                 ARG_VERSION = 0x100,
 152         };
 153
 154         static const struct option options[] = {
 155                 { "help",         no_argument,       NULL, 'h'           },
 156                 { "version",      no_argument,       NULL, ARG_VERSION   },
 157                 {}
 158         };
 159
 160         int c;
 161
 162         assert(argc >= 0);
 163         assert(argv);
 164
 165         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
 166                 switch(c) {
 167                 case 'h':
 168                         help();
 169                         return 0; /* done */
 170
 171                 case ARG_VERSION:
 172                         return version();
 173
 174                 case '?':
 175                         return -EINVAL;
 176
 177                 default:
 178                         assert_not_reached("Unhandled option");
 179                 }
 180
 181         if (argc - optind != 1) {
 182                 log_error("Usage: %s COMMAND",
 183                           program_invocation_short_name);
 184                 return -EINVAL;
 185         }
 186
 187         arg_verb = argv[optind];
 188
 189         if (!streq(arg_verb, "suspend") &&
 190             !streq(arg_verb, "hibernate") &&
 191             !streq(arg_verb, "hybrid-sleep")) {
 192                 log_error("Unknown command '%s'.", arg_verb);
 193                 return -EINVAL;
 194         }
 195
 196         return 1 /* work to do */;
 197 }
 198
 199 int main(int argc, char *argv[]) {
 200         _cleanup_strv_free_ char **modes = NULL, **states = NULL;
 201         int r;
 202
 203         log_set_target(LOG_TARGET_AUTO);
 204         log_parse_environment();
 205         log_open();
 206
 207         r = parse_argv(argc, argv);
 208         if (r <= 0)
 209                 goto finish;
 210
 211         r = parse_sleep_config(arg_verb, &modes, &states);
 212         if (r < 0)
 213                 goto finish;
 214
 215         r = execute(modes, states);
 216
 217 finish:
 218         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 219 }