src/sleep/sleep.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   Copyright © 2010-2017 Canonical
   4   Copyright © 2018 Dell Inc.
   5 ***/
   6
   7 //#include <errno.h>
   8 //#include <getopt.h>
   9 //#include <linux/fiemap.h>
  10 //#include <stdio.h>
  11
  12 #include "sd-messages.h"
  13
  14 #include "parse-util.h"
  15 #include "def.h"
  16 #include "exec-util.h"
  17 #include "fd-util.h"
  18 #include "fileio.h"
  19 //#include "log.h"
  20 #include "sleep-config.h"
  21 #include "stdio-util.h"
  22 #include "string-util.h"
  23 #include "strv.h"
  24 //#include "util.h"
  25
  26 /// Additional includes needed by elogind
  27 #include "sleep.h"
  28
  29 static char* arg_verb = NULL;
  30
  31 static int write_hibernate_location_info(void) {
  32         _cleanup_free_ char *device = NULL, *type = NULL;
  33         _cleanup_free_ struct fiemap *fiemap = NULL;
  34         char offset_str[DECIMAL_STR_MAX(uint64_t)];
  35         char device_str[DECIMAL_STR_MAX(uint64_t)];
  36         _cleanup_close_ int fd = -1;
  37         struct stat stb;
  38         uint64_t offset;
  39         int r;
  40
  41         r = find_hibernate_location(&device, &type, NULL, NULL);
  42         if (r < 0)
  43                 return log_debug_errno(r, "Unable to find hibernation location: %m");
  44
  45         /* if it's a swap partition, we just write the disk to /sys/power/resume */
  46         if (streq(type, "partition"))
  47                 return write_string_file("/sys/power/resume", device, 0);
  48         else if (!streq(type, "file"))
  49                 return log_debug_errno(EINVAL, "Invalid hibernate type %s: %m",
  50                                        type);
  51
  52         /* Only available in 4.17+ */
  53         if (access("/sys/power/resume_offset", F_OK) < 0) {
  54                 if (errno == ENOENT)
  55                         return 0;
  56                 return log_debug_errno(errno, "/sys/power/resume_offset unavailable: %m");
  57         }
  58
  59         r = access("/sys/power/resume_offset", W_OK);
  60         if (r < 0)
  61                 return log_debug_errno(errno, "/sys/power/resume_offset not writeable: %m");
  62
  63         fd = open(device, O_RDONLY | O_CLOEXEC | O_NONBLOCK);
  64         if (fd < 0)
  65                 return log_debug_errno(errno, "Unable to open '%s': %m", device);
  66         r = fstat(fd, &stb);
  67         if (r < 0)
  68                 return log_debug_errno(errno, "Unable to stat %s: %m", device);
  69         r = read_fiemap(fd, &fiemap);
  70         if (r < 0)
  71                 return log_debug_errno(r, "Unable to read extent map for '%s': %m",
  72                                        device);
  73         if (fiemap->fm_mapped_extents == 0) {
  74                 log_debug("No extents found in '%s'", device);
  75                 return -EINVAL;
  76         }
  77         offset = fiemap->fm_extents[0].fe_physical / page_size();
  78         xsprintf(offset_str, "%" PRIu64, offset);
  79         r = write_string_file("/sys/power/resume_offset", offset_str, 0);
  80         if (r < 0)
  81                 return log_debug_errno(r, "Failed to write offset '%s': %m",
  82                                        offset_str);
  83
  84         xsprintf(device_str, "%lx", (unsigned long)stb.st_dev);
  85         r = write_string_file("/sys/power/resume", device_str, 0);
  86         if (r < 0)
  87                 return log_debug_errno(r, "Failed to write device '%s': %m",
  88                                        device_str);
  89         return 0;
  90 }
  91
  92 static int write_mode(char **modes) {
  93         int r = 0;
  94         char **mode;
  95
  96         STRV_FOREACH(mode, modes) {
  97                 int k;
  98
  99                 k = write_string_file("/sys/power/disk", *mode, 0);
 100                 if (k == 0)
 101                         return 0;
 102
 103                 log_debug_errno(k, "Failed to write '%s' to /sys/power/disk: %m",
 104                                 *mode);
 105                 if (r == 0)
 106                         r = k;
 107         }
 108
 109         return r;
 110 }
 111
 112 static int write_state(FILE **f, char **states) {
 113         char **state;
 114         int r = 0;
 115
 116         STRV_FOREACH(state, states) {
 117                 int k;
 118
 119                 k = write_string_stream(*f, *state, 0);
 120                 if (k == 0)
 121                         return 0;
 122                 log_debug_errno(k, "Failed to write '%s' to /sys/power/state: %m",
 123                                 *state);
 124                 if (r == 0)
 125                         r = k;
 126
 127                 fclose(*f);
 128                 *f = fopen("/sys/power/state", "we");
 129                 if (!*f)
 130                         return -errno;
 131         }
 132
 133         return r;
 134 }
 135
 136 static int execute(char **modes, char **states) {
 137
 138         char *arguments[] = {
 139                 NULL,
 140                 (char*) "pre",
 141                 arg_verb,
 142                 NULL
 143         };
 144         static const char* const dirs[] = {
 145                 SYSTEM_SLEEP_PATH,
 146                 NULL
 147         };
 148
 149         int r;
 150         _cleanup_fclose_ FILE *f = NULL;
 151
 152         /* This file is opened first, so that if we hit an error,
 153          * we can abort before modifying any state. */
 154         f = fopen("/sys/power/state", "we");
 155         if (!f)
 156                 return log_error_errno(errno, "Failed to open /sys/power/state: %m");
 157
 158         /* Configure the hibernation mode */
 159         if (!strv_isempty(modes)) {
 160                 r = write_hibernate_location_info();
 161                 if (r < 0)
 162                         return log_error_errno(r, "Failed to write hibernation disk offset: %m");
 163                 r = write_mode(modes);
 164                 if (r < 0)
 165                         return log_error_errno(r, "Failed to write mode to /sys/power/disk: %m");;
 166         }
 167
 168         execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, arguments);
 169
 170         log_struct(LOG_INFO,
 171                    "MESSAGE_ID=" SD_MESSAGE_SLEEP_START_STR,
 172                    LOG_MESSAGE("Suspending system..."),
 173                    "SLEEP=%s", arg_verb);
 174
 175         r = write_state(&f, states);
 176         if (r < 0)
 177                 return log_error_errno(r, "Failed to write /sys/power/state: %m");
 178
 179         log_struct(LOG_INFO,
 180                    "MESSAGE_ID=" SD_MESSAGE_SLEEP_STOP_STR,
 181                    LOG_MESSAGE("System resumed."),
 182                    "SLEEP=%s", arg_verb);
 183
 184         arguments[1] = (char*) "post";
 185         execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, arguments);
 186
 187         return r;
 188 }
 189
 190 static int read_wakealarm(uint64_t *result) {
 191         _cleanup_free_ char *t = NULL;
 192
 193         if (read_one_line_file("/sys/class/rtc/rtc0/since_epoch", &t) >= 0)
 194                 return safe_atou64(t, result);
 195         return -EBADF;
 196 }
 197
 198 static int write_wakealarm(const char *str) {
 199
 200         _cleanup_fclose_ FILE *f = NULL;
 201         int r;
 202
 203         f = fopen("/sys/class/rtc/rtc0/wakealarm", "we");
 204         if (!f)
 205                 return log_error_errno(errno, "Failed to open /sys/class/rtc/rtc0/wakealarm: %m");
 206
 207         r = write_string_stream(f, str, 0);
 208         if (r < 0)
 209                 return log_error_errno(r, "Failed to write '%s' to /sys/class/rtc/rtc0/wakealarm: %m", str);
 210
 211         return 0;
 212 }
 213
 214 static int execute_s2h(usec_t hibernate_delay_sec) {
 215
 216         _cleanup_strv_free_ char **hibernate_modes = NULL, **hibernate_states = NULL,
 217                                  **suspend_modes = NULL, **suspend_states = NULL;
 218         usec_t orig_time, cmp_time;
 219         char time_str[DECIMAL_STR_MAX(uint64_t)];
 220         int r;
 221
 222 #if 0 /// Already parsed by elogind config
 223         r = parse_sleep_config("suspend", &suspend_modes, &suspend_states,
 224                                NULL);
 225         if (r < 0)
 226                 return r;
 227
 228         r = parse_sleep_config("hibernate", &hibernate_modes,
 229                                &hibernate_states, NULL);
 230         if (r < 0)
 231                 return r;
 232 #endif // 0
 233
 234         r = read_wakealarm(&orig_time);
 235         if (r < 0)
 236                 return log_error_errno(errno, "Failed to read time: %d", r);
 237
 238         orig_time += hibernate_delay_sec / USEC_PER_SEC;
 239         xsprintf(time_str, "%" PRIu64, orig_time);
 240
 241         r = write_wakealarm(time_str);
 242         if (r < 0)
 243                 return r;
 244
 245         log_debug("Set RTC wake alarm for %s", time_str);
 246
 247         r = execute(suspend_modes, suspend_states);
 248         if (r < 0)
 249                 return r;
 250
 251         r = read_wakealarm(&cmp_time);
 252         if (r < 0)
 253                 return log_error_errno(errno, "Failed to read time: %d", r);
 254
 255         /* reset RTC */
 256         r = write_wakealarm("0");
 257         if (r < 0)
 258                 return r;
 259
 260         log_debug("Woke up at %"PRIu64, cmp_time);
 261
 262         /* if woken up after alarm time, hibernate */
 263         if (cmp_time >= orig_time)
 264                 r = execute(hibernate_modes, hibernate_states);
 265
 266         return r;
 267 }
 268
 269 #if 0 /// elogind calls execute() by itself and does not need another binary
 270 static void help(void) {
 271         printf("%s COMMAND\n\n"
 272                "Suspend the system, hibernate the system, or both.\n\n"
 273                "Commands:\n"
 274                "  -h --help            Show this help and exit\n"
 275                "  --version            Print version string and exit\n"
 276                "  suspend              Suspend the system\n"
 277                "  hibernate            Hibernate the system\n"
 278                "  hybrid-sleep         Both hibernate and suspend the system\n"
 279                "  suspend-then-hibernate Initially suspend and then hibernate\n"
 280                "                       the system after a fixed period of time\n"
 281                , program_invocation_short_name);
 282 }
 283
 284 static int parse_argv(int argc, char *argv[]) {
 285         enum {
 286                 ARG_VERSION = 0x100,
 287         };
 288
 289         static const struct option options[] = {
 290                 { "help",         no_argument,       NULL, 'h'           },
 291                 { "version",      no_argument,       NULL, ARG_VERSION   },
 292                 {}
 293         };
 294
 295         int c;
 296
 297         assert(argc >= 0);
 298         assert(argv);
 299
 300         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
 301                 switch(c) {
 302                 case 'h':
 303                         help();
 304                         return 0; /* done */
 305
 306                 case ARG_VERSION:
 307                         return version();
 308
 309                 case '?':
 310                         return -EINVAL;
 311
 312                 default:
 313                         assert_not_reached("Unhandled option");
 314                 }
 315
 316         if (argc - optind != 1) {
 317                 log_error("Usage: %s COMMAND",
 318                           program_invocation_short_name);
 319                 return -EINVAL;
 320         }
 321
 322         arg_verb = argv[optind];
 323
 324         if (!streq(arg_verb, "suspend") &&
 325             !streq(arg_verb, "hibernate") &&
 326             !streq(arg_verb, "hybrid-sleep") &&
 327             !streq(arg_verb, "suspend-then-hibernate")) {
 328                 log_error("Unknown command '%s'.", arg_verb);
 329                 return -EINVAL;
 330         }
 331
 332         return 1 /* work to do */;
 333 }
 334
 335 int main(int argc, char *argv[]) {
 336         _cleanup_strv_free_ char **modes = NULL, **states = NULL;
 337         usec_t delay = 0;
 338         int r;
 339
 340         log_set_target(LOG_TARGET_AUTO);
 341         log_parse_environment();
 342         log_open();
 343
 344         r = parse_argv(argc, argv);
 345         if (r <= 0)
 346                 goto finish;
 347
 348         r = parse_sleep_config(arg_verb, &modes, &states, &delay);
 349         if (r < 0)
 350                 goto finish;
 351
 352 #else
 353 int do_sleep(const char *verb, char **modes, char **states, usec_t delay) {
 354         int r;
 355
 356         assert(verb);
 357         arg_verb = (char*)verb;
 358 #endif // 0
 359         if (streq(arg_verb, "suspend-then-hibernate"))
 360                 r = execute_s2h(delay);
 361         else
 362                 r = execute(modes, states);
 363 #if 0 /// In elogind we give the result back, no interpretation here.
 364 finish:
 365         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 366 #else
 367         return r;
 368 }
 369 #endif // 0