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 <stdio.h>
  24 #include <errno.h>
  25 #include <string.h>
  26 #include <getopt.h>
  27
  28 #include "sd-id128.h"
  29 #include "sd-messages.h"
  30 #include "log.h"
  31 #include "util.h"
  32 #include "strv.h"
  33 #include "fileio.h"
  34 #include "build.h"
  35 #include "sleep-config.h"
  36 #include "def.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);
  48                 if (k == 0)
  49                         return 0;
  50
  51                 log_debug("Failed to write '%s' to /sys/power/disk: %s",
  52                           *mode, strerror(-k));
  53                 if (r == 0)
  54                         r = k;
  55         }
  56
  57         if (r < 0)
  58                 log_error("Failed to write mode to /sys/power/disk: %s",
  59                           strerror(-r));
  60
  61         return r;
  62 }
  63
  64 static int write_state(FILE **f, char **states) {
  65         char **state;
  66         int r = 0;
  67
  68         STRV_FOREACH(state, states) {
  69                 int k;
  70
  71                 k = write_string_to_file(*f, *state);
  72                 if (k == 0)
  73                         return 0;
  74                 log_debug("Failed to write '%s' to /sys/power/state: %s",
  75                           *state, strerror(-k));
  76                 if (r == 0)
  77                         r = k;
  78
  79                 fclose(*f);
  80                 *f = fopen("/sys/power/state", "we");
  81                 if (!*f) {
  82                         log_error("Failed to open /sys/power/state: %m");
  83                         return -errno;
  84                 }
  85         }
  86
  87         return r;
  88 }
  89
  90 static int execute(char **modes, char **states) {
  91         char* arguments[4];
  92         int r;
  93         _cleanup_fclose_ FILE *f = NULL;
  94         const char* note = strappenda("SLEEP=", arg_verb);
  95
  96         /* This file is opened first, so that if we hit an error,
  97          * we can abort before modifying any state. */
  98         f = fopen("/sys/power/state", "we");
  99         if (!f) {
 100                 log_error("Failed to open /sys/power/state: %m");
 101                 return -errno;
 102         }
 103
 104         /* Configure the hibernation mode */
 105         r = write_mode(modes);
 106         if (r < 0)
 107                 return r;
 108
 109         arguments[0] = NULL;
 110         arguments[1] = (char*) "pre";
 111         arguments[2] = arg_verb;
 112         arguments[3] = NULL;
 113         execute_directory(SYSTEM_SLEEP_PATH, NULL, DEFAULT_TIMEOUT_USEC, arguments);
 114
 115         log_struct(LOG_INFO,
 116                    MESSAGE_ID(SD_MESSAGE_SLEEP_START),
 117                    "MESSAGE=Suspending system...",
 118                    note,
 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),
 127                    "MESSAGE=System resumed.",
 128                    note,
 129                    NULL);
 130
 131         arguments[1] = (char*) "post";
 132         execute_directory(SYSTEM_SLEEP_PATH, NULL, DEFAULT_TIMEOUT_USEC, arguments);
 133
 134         return r;
 135 }
 136
 137 static int 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         return 0;
 150 }
 151
 152 static int parse_argv(int argc, char *argv[]) {
 153         enum {
 154                 ARG_VERSION = 0x100,
 155         };
 156
 157         static const struct option options[] = {
 158                 { "help",         no_argument,       NULL, 'h'           },
 159                 { "version",      no_argument,       NULL, ARG_VERSION   },
 160                 {}
 161         };
 162
 163         int c;
 164
 165         assert(argc >= 0);
 166         assert(argv);
 167
 168         while ((c = getopt_long(argc, argv, "+h", options, NULL)) >= 0)
 169                 switch(c) {
 170                 case 'h':
 171                         return help();
 172
 173                 case ARG_VERSION:
 174                         puts(PACKAGE_STRING);
 175                         puts(SYSTEMD_FEATURES);
 176                         return 0 /* done */;
 177
 178                 case '?':
 179                         return -EINVAL;
 180
 181                 default:
 182                         assert_not_reached("Unhandled option");
 183                 }
 184
 185         if (argc - optind != 1) {
 186                 log_error("Usage: %s COMMAND",
 187                           program_invocation_short_name);
 188                 return -EINVAL;
 189         }
 190
 191         arg_verb = argv[optind];
 192
 193         if (!streq(arg_verb, "suspend") &&
 194             !streq(arg_verb, "hibernate") &&
 195             !streq(arg_verb, "hybrid-sleep")) {
 196                 log_error("Unknown command '%s'.", arg_verb);
 197                 return -EINVAL;
 198         }
 199
 200         return 1 /* work to do */;
 201 }
 202
 203 int main(int argc, char *argv[]) {
 204         _cleanup_strv_free_ char **modes = NULL, **states = NULL;
 205         int r;
 206
 207         log_set_target(LOG_TARGET_AUTO);
 208         log_parse_environment();
 209         log_open();
 210
 211         r = parse_argv(argc, argv);
 212         if (r <= 0)
 213                 goto finish;
 214
 215         r = parse_sleep_config(arg_verb, &modes, &states);
 216         if (r < 0)
 217                 goto finish;
 218
 219         r = execute(modes, states);
 220
 221 finish:
 222         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 223 }