| /*** |
| This file is part of systemd. |
| |
| Copyright 2013 Zbigniew Jędrzejewski-Szmek |
| |
| systemd is free software; you can redistribute it and/or modify it |
| under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation; either version 2.1 of the License, or |
| (at your option) any later version. |
| |
| systemd is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with systemd; If not, see <http://www.gnu.org/licenses/>. |
| ***/ |
| |
| #include <errno.h> |
| #include <stdbool.h> |
| #include <stddef.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <syslog.h> |
| #include <unistd.h> |
| |
| #include "alloc-util.h" |
| #include "conf-parser.h" |
| #include "def.h" |
| #include "env-util.h" |
| #include "fd-util.h" |
| #include "fileio.h" |
| #include "log.h" |
| #include "macro.h" |
| #include "parse-util.h" |
| #include "sleep-config.h" |
| #include "string-util.h" |
| #include "strv.h" |
| |
| #define USE(x, y) do { (x) = (y); (y) = NULL; } while (0) |
| |
| int parse_sleep_config(const char *verb, char ***_modes, char ***_states) { |
| |
| _cleanup_strv_free_ char |
| **suspend_mode = NULL, **suspend_state = NULL, |
| **hibernate_mode = NULL, **hibernate_state = NULL, |
| **hybrid_mode = NULL, **hybrid_state = NULL; |
| char **modes, **states; |
| |
| const ConfigTableItem items[] = { |
| { "Sleep", "SuspendMode", config_parse_strv, 0, &suspend_mode }, |
| { "Sleep", "SuspendState", config_parse_strv, 0, &suspend_state }, |
| { "Sleep", "HibernateMode", config_parse_strv, 0, &hibernate_mode }, |
| { "Sleep", "HibernateState", config_parse_strv, 0, &hibernate_state }, |
| { "Sleep", "HybridSleepMode", config_parse_strv, 0, &hybrid_mode }, |
| { "Sleep", "HybridSleepState", config_parse_strv, 0, &hybrid_state }, |
| {} |
| }; |
| |
| config_parse_many_nulstr(PKGSYSCONFDIR "/sleep.conf", |
| CONF_PATHS_NULSTR("systemd/sleep.conf.d"), |
| "Sleep\0", config_item_table_lookup, items, |
| false, NULL); |
| |
| if (streq(verb, "suspend")) { |
| /* empty by default */ |
| USE(modes, suspend_mode); |
| |
| if (suspend_state) |
| USE(states, suspend_state); |
| else |
| states = strv_new("mem", "standby", "freeze", NULL); |
| |
| } else if (streq(verb, "hibernate")) { |
| if (hibernate_mode) |
| USE(modes, hibernate_mode); |
| else |
| modes = strv_new("platform", "shutdown", NULL); |
| |
| if (hibernate_state) |
| USE(states, hibernate_state); |
| else |
| states = strv_new("disk", NULL); |
| |
| } else if (streq(verb, "hybrid-sleep")) { |
| if (hybrid_mode) |
| USE(modes, hybrid_mode); |
| else |
| modes = strv_new("suspend", "platform", "shutdown", NULL); |
| |
| if (hybrid_state) |
| USE(states, hybrid_state); |
| else |
| states = strv_new("disk", NULL); |
| |
| } else |
| assert_not_reached("what verb"); |
| |
| if ((!modes && !streq(verb, "suspend")) || !states) { |
| strv_free(modes); |
| strv_free(states); |
| return log_oom(); |
| } |
| |
| *_modes = modes; |
| *_states = states; |
| return 0; |
| } |
| |
| int can_sleep_state(char **types) { |
| char **type; |
| int r; |
| _cleanup_free_ char *p = NULL; |
| |
| if (strv_isempty(types)) |
| return true; |
| |
| /* If /sys is read-only we cannot sleep */ |
| if (access("/sys/power/state", W_OK) < 0) |
| return false; |
| |
| r = read_one_line_file("/sys/power/state", &p); |
| if (r < 0) |
| return false; |
| |
| STRV_FOREACH(type, types) { |
| const char *word, *state; |
| size_t l, k; |
| |
| k = strlen(*type); |
| FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state) |
| if (l == k && memcmp(word, *type, l) == 0) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| int can_sleep_disk(char **types) { |
| char **type; |
| int r; |
| _cleanup_free_ char *p = NULL; |
| |
| if (strv_isempty(types)) |
| return true; |
| |
| /* If /sys is read-only we cannot sleep */ |
| if (access("/sys/power/disk", W_OK) < 0) |
| return false; |
| |
| r = read_one_line_file("/sys/power/disk", &p); |
| if (r < 0) |
| return false; |
| |
| STRV_FOREACH(type, types) { |
| const char *word, *state; |
| size_t l, k; |
| |
| k = strlen(*type); |
| FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state) { |
| if (l == k && memcmp(word, *type, l) == 0) |
| return true; |
| |
| if (l == k + 2 && |
| word[0] == '[' && |
| memcmp(word + 1, *type, l - 2) == 0 && |
| word[l-1] == ']') |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| #define HIBERNATION_SWAP_THRESHOLD 0.98 |
| |
| static int hibernation_partition_size(size_t *size, size_t *used) { |
| _cleanup_fclose_ FILE *f; |
| unsigned i; |
| |
| assert(size); |
| assert(used); |
| |
| f = fopen("/proc/swaps", "re"); |
| if (!f) { |
| log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, |
| "Failed to retrieve open /proc/swaps: %m"); |
| assert(errno > 0); |
| return -errno; |
| } |
| |
| (void) fscanf(f, "%*s %*s %*s %*s %*s\n"); |
| |
| for (i = 1;; i++) { |
| _cleanup_free_ char *dev = NULL, *type = NULL; |
| size_t size_field, used_field; |
| int k; |
| |
| k = fscanf(f, |
| "%ms " /* device/file */ |
| "%ms " /* type of swap */ |
| "%zu " /* swap size */ |
| "%zu " /* used */ |
| "%*i\n", /* priority */ |
| &dev, &type, &size_field, &used_field); |
| if (k != 4) { |
| if (k == EOF) |
| break; |
| |
| log_warning("Failed to parse /proc/swaps:%u", i); |
| continue; |
| } |
| |
| if (streq(type, "partition") && endswith(dev, "\\040(deleted)")) { |
| log_warning("Ignoring deleted swapfile '%s'.", dev); |
| continue; |
| } |
| |
| *size = size_field; |
| *used = used_field; |
| return 0; |
| } |
| |
| log_debug("No swap partitions were found."); |
| return -ENOSYS; |
| } |
| |
| static bool enough_memory_for_hibernation(void) { |
| _cleanup_free_ char *active = NULL; |
| unsigned long long act = 0; |
| size_t size = 0, used = 0; |
| int r; |
| |
| if (getenv_bool("SYSTEMD_BYPASS_HIBERNATION_MEMORY_CHECK") > 0) |
| return true; |
| |
| r = hibernation_partition_size(&size, &used); |
| if (r < 0) |
| return false; |
| |
| r = get_proc_field("/proc/meminfo", "Active(anon)", WHITESPACE, &active); |
| if (r < 0) { |
| log_error_errno(r, "Failed to retrieve Active(anon) from /proc/meminfo: %m"); |
| return false; |
| } |
| |
| r = safe_atollu(active, &act); |
| if (r < 0) { |
| log_error_errno(r, "Failed to parse Active(anon) from /proc/meminfo: %s: %m", |
| active); |
| return false; |
| } |
| |
| r = act <= (size - used) * HIBERNATION_SWAP_THRESHOLD; |
| log_debug("Hibernation is %spossible, Active(anon)=%llu kB, size=%zu kB, used=%zu kB, threshold=%.2g%%", |
| r ? "" : "im", act, size, used, 100*HIBERNATION_SWAP_THRESHOLD); |
| |
| return r; |
| } |
| |
| int can_sleep(const char *verb) { |
| _cleanup_strv_free_ char **modes = NULL, **states = NULL; |
| int r; |
| |
| assert(streq(verb, "suspend") || |
| streq(verb, "hibernate") || |
| streq(verb, "hybrid-sleep")); |
| |
| r = parse_sleep_config(verb, &modes, &states); |
| if (r < 0) |
| return false; |
| |
| if (!can_sleep_state(states) || !can_sleep_disk(modes)) |
| return false; |
| |
| return streq(verb, "suspend") || enough_memory_for_hibernation(); |
| } |