+/***
+ 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"
+
+#if 0 /// UNNEEDED by elogind
+#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;
+}
+#endif // 0
+
+#if 1 /// Only available in this file for elogind
+static
+#endif // 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;
+}
+
+#if 1 /// Only available in this file for elogind
+static
+#endif // 0
+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 0 /// elogind does not allow any bypass, we are never init!
+ if (getenv_bool("SYSTEMD_BYPASS_HIBERNATION_MEMORY_CHECK") > 0)
+ return true;
+#endif // 0
+
+ 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;
+}
+
+#if 0 /// elogind has to do, or better, *can* do it differently
+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();
+}
+#else
+int can_sleep(Manager *m, const char *verb) {
+
+ assert(streq(verb, "suspend") ||
+ streq(verb, "hibernate") ||
+ streq(verb, "hybrid-sleep"));
+
+ if ( streq(verb, "suspend")
+ && ( !can_sleep_state(m->suspend_state)
+ || !can_sleep_disk(m->suspend_mode) ) )
+ return false;
+
+ if ( streq(verb, "hibernate")
+ && ( !can_sleep_state(m->hibernate_state)
+ || !can_sleep_disk(m->hibernate_mode) ) )
+ return false;
+
+ if ( streq(verb, "hybrid-sleep")
+ && ( !can_sleep_state(m->hybrid_sleep_state)
+ || !can_sleep_disk(m->hybrid_sleep_mode) ) )
+ return false;
+
+
+ return streq(verb, "suspend") || enough_memory_for_hibernation();
+}
+#endif // 0
~ianmdlvl / elogind.git / commitdiff