2013-05-04 18:31:28 +02:00
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2013 Zbigniew Jędrzejewski-Szmek
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <stdio.h>
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#include "conf-parser.h"
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#include "sleep-config.h"
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#include "fileio.h"
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#include "log.h"
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#include "strv.h"
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#include "util.h"
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int parse_sleep_config(const char *verb, char ***modes, char ***states) {
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_cleanup_strv_free_ char
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**suspend_mode = NULL, **suspend_state = NULL,
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**hibernate_mode = NULL, **hibernate_state = NULL,
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**hybrid_mode = NULL, **hybrid_state = NULL;
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const ConfigTableItem items[] = {
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{ "Sleep", "SuspendMode", config_parse_strv, 0, &suspend_mode },
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{ "Sleep", "SuspendState", config_parse_strv, 0, &suspend_state },
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{ "Sleep", "HibernateMode", config_parse_strv, 0, &hibernate_mode },
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{ "Sleep", "HibernateState", config_parse_strv, 0, &hibernate_state },
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{ "Sleep", "HybridSleepMode", config_parse_strv, 0, &hybrid_mode },
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{ "Sleep", "HybridSleepState", config_parse_strv, 0, &hybrid_state },
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{}};
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int r;
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FILE _cleanup_fclose_ *f;
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f = fopen(PKGSYSCONFDIR "/sleep.conf", "re");
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2013-05-07 17:35:23 +02:00
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if (!f)
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log_full(errno == ENOENT ? LOG_DEBUG: LOG_WARNING,
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"Failed to open configuration file " PKGSYSCONFDIR "/sleep.conf: %m");
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else {
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r = config_parse(NULL, PKGSYSCONFDIR "/sleep.conf", f, "Sleep\0",
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config_item_table_lookup, (void*) items, false, false, NULL);
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if (r < 0)
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log_warning("Failed to parse configuration file: %s", strerror(-r));
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2013-05-04 18:31:28 +02:00
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}
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if (streq(verb, "suspend")) {
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/* empty by default */
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*modes = suspend_mode;
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if (suspend_state)
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*states = suspend_state;
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else
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*states = strv_split_nulstr("mem\0standby\0freeze\0");
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suspend_mode = suspend_state = NULL;
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} else if (streq(verb, "hibernate")) {
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if (hibernate_mode)
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*modes = hibernate_mode;
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else
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*modes = strv_split_nulstr("platform\0shutdown\0");
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if (hibernate_state)
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*states = hibernate_state;
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else
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*states = strv_split_nulstr("disk\0");
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hibernate_mode = hibernate_state = NULL;
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} else if (streq(verb, "hybrid-sleep")) {
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if (hybrid_mode)
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*modes = hybrid_mode;
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else
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*modes = strv_split_nulstr("suspend\0platform\0shutdown\0");
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if (hybrid_state)
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*states = hybrid_state;
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else
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*states = strv_split_nulstr("disk\0");
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hybrid_mode = hybrid_state = NULL;
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} else
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assert_not_reached("what verb");
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if (!modes || !states) {
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strv_free(*modes);
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strv_free(*states);
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return log_oom();
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}
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return 0;
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}
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int can_sleep_state(char **types) {
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char *w, *state, **type;
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int r;
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_cleanup_free_ char *p = NULL;
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if (strv_isempty(types))
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return true;
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/* If /sys is read-only we cannot sleep */
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if (access("/sys/power/state", W_OK) < 0)
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return false;
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r = read_one_line_file("/sys/power/state", &p);
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if (r < 0)
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return false;
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STRV_FOREACH(type, types) {
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size_t l, k;
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k = strlen(*type);
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FOREACH_WORD_SEPARATOR(w, l, p, WHITESPACE, state)
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if (l == k && memcmp(w, *type, l) == 0)
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return true;
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}
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return false;
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}
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int can_sleep_disk(char **types) {
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char *w, *state, **type;
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int r;
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_cleanup_free_ char *p = NULL;
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if (strv_isempty(types))
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return true;
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/* If /sys is read-only we cannot sleep */
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if (access("/sys/power/disk", W_OK) < 0)
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return false;
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r = read_one_line_file("/sys/power/disk", &p);
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if (r < 0)
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return false;
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STRV_FOREACH(type, types) {
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size_t l, k;
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k = strlen(*type);
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FOREACH_WORD_SEPARATOR(w, l, p, WHITESPACE, state) {
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if (l == k && memcmp(w, *type, l) == 0)
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return true;
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if (l == k + 2 && w[0] == '[' && memcmp(w + 1, *type, l - 2) == 0 && w[l-1] == ']')
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return true;
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}
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}
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return false;
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}
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2013-09-14 01:41:52 +02:00
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#define HIBERNATION_SWAP_THRESHOLD 0.98
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static bool enough_memory_for_hibernation(void) {
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_cleanup_free_ char *active = NULL, *swapfree = NULL;
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unsigned long long act, swap;
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int r;
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r = get_status_field("/proc/meminfo", "\nSwapFree:", &swapfree);
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if (r < 0) {
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2013-09-15 14:40:16 +02:00
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log_full(r == -ENOENT ? LOG_DEBUG : LOG_WARNING,
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"Failed to retrieve SwapFree from /proc/meminfo: %s", strerror(-r));
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2013-09-14 01:41:52 +02:00
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return false;
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}
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r = safe_atollu(swapfree, &swap);
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if (r < 0) {
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log_error("Failed to parse SwapFree from /proc/meminfo: %s: %s",
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swapfree, strerror(-r));
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return false;
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}
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r = get_status_field("/proc/meminfo", "\nActive(anon):", &active);
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if (r < 0) {
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log_error("Failed to retrieve Active(anon) from /proc/meminfo: %s", strerror(-r));
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return false;
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}
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r = safe_atollu(active, &act);
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if (r < 0) {
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log_error("Failed to parse Active(anon) from /proc/meminfo: %s: %s",
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active, strerror(-r));
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return false;
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}
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r = act <= swap * HIBERNATION_SWAP_THRESHOLD;
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log_debug("Hibernation is %spossible, Active(anon)=%llu kB, SwapFree=%llu kB, threshold=%.2g%%",
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r ? "" : "im", act, swap, 100*HIBERNATION_SWAP_THRESHOLD);
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return r;
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}
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2013-05-04 18:31:28 +02:00
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int can_sleep(const char *verb) {
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_cleanup_strv_free_ char **modes = NULL, **states = NULL;
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int r;
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assert(streq(verb, "suspend") ||
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streq(verb, "hibernate") ||
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streq(verb, "hybrid-sleep"));
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r = parse_sleep_config(verb, &modes, &states);
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if (r < 0)
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return false;
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2013-09-14 01:41:52 +02:00
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if (!can_sleep_state(states) || !can_sleep_disk(modes))
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return false;
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return streq(verb, "suspend") || enough_memory_for_hibernation();
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2013-05-04 18:31:28 +02:00
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}
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