diff options
Diffstat (limited to 'src/libshared/sleep-config.c')
| -rw-r--r-- | src/libshared/sleep-config.c | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/src/libshared/sleep-config.c b/src/libshared/sleep-config.c new file mode 100644 index 0000000000..a0aef66bc8 --- /dev/null +++ b/src/libshared/sleep-config.c @@ -0,0 +1,274 @@ +/*** + 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 "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(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; + + 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(); +} |