1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
26 #include <sys/utsname.h>
29 #include "utmp-wtmp.h"
31 int utmp_get_runlevel(int *runlevel, int *previous) {
32 struct utmpx lookup, *found;
38 /* If these values are set in the environment this takes
39 * precedence. Presumably, sysvinit does this to work around a
40 * race condition that would otherwise exist where we'd always
41 * go to disk and hence might read runlevel data that might be
42 * very new and does not apply to the current script being
45 if ((e = getenv("RUNLEVEL")) && e[0] > 0) {
49 /* $PREVLEVEL seems to be an Upstart thing */
51 if ((e = getenv("PREVLEVEL")) && e[0] > 0)
60 if (utmpxname(_PATH_UTMPX) < 0)
66 lookup.ut_type = RUN_LVL;
68 if (!(found = getutxid(&lookup)))
73 a = found->ut_pid & 0xFF;
74 b = (found->ut_pid >> 8) & 0xFF;
92 static void init_entry(struct utmpx *store, usec_t timestamp) {
101 timestamp = now(CLOCK_REALTIME);
103 store->ut_tv.tv_sec = timestamp / USEC_PER_SEC;
104 store->ut_tv.tv_usec = timestamp % USEC_PER_SEC;
106 if (uname(&uts) >= 0)
107 strncpy(store->ut_host, uts.release, sizeof(store->ut_host));
109 strncpy(store->ut_line, "~", sizeof(store->ut_line)); /* or ~~ ? */
110 strncpy(store->ut_id, "~~", sizeof(store->ut_id));
113 static int write_entry_utmp(const struct utmpx *store) {
118 /* utmp is similar to wtmp, but there is only one entry for
119 * each entry type resp. user; i.e. basically a key/value
122 if (utmpxname(_PATH_UTMPX) < 0)
127 if (!pututxline(store))
137 static int write_entry_wtmp(const struct utmpx *store) {
140 /* wtmp is a simple append-only file where each entry is
141 simply appended to * the end; i.e. basically a log. */
144 updwtmpx(_PATH_WTMPX, store);
148 static int write_entry_both(const struct utmpx *store) {
151 r = write_entry_utmp(store);
152 s = write_entry_wtmp(store);
157 /* If utmp/wtmp have been disabled, that's a good thing, hence
158 * ignore the errors */
165 int utmp_put_shutdown(usec_t timestamp) {
168 init_entry(&store, timestamp);
170 store.ut_type = RUN_LVL;
171 strncpy(store.ut_user, "shutdown", sizeof(store.ut_user));
173 return write_entry_both(&store);
176 int utmp_put_reboot(usec_t timestamp) {
179 init_entry(&store, timestamp);
181 store.ut_type = BOOT_TIME;
182 strncpy(store.ut_user, "reboot", sizeof(store.ut_type));
184 return write_entry_both(&store);
187 int utmp_put_runlevel(usec_t timestamp, int runlevel, int previous) {
191 assert(runlevel > 0);
194 /* Find the old runlevel automatically */
196 if ((r = utmp_get_runlevel(&previous, NULL)) < 0)
199 if (previous == runlevel)
203 init_entry(&store, timestamp);
205 store.ut_type = RUN_LVL;
206 store.ut_pid = (runlevel & 0xFF) | ((previous & 0xFF) << 8);
207 strncpy(store.ut_user, "runlevel", sizeof(store.ut_user));
209 return write_entry_both(&store);