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e537352b9b
This also includes code that writes utmp/wtmp records when applicable, making use the mount infrastructure to detct when those files are accessible. Finally, this also introduces a --dump-configuration-items switch.
211 lines
5.3 KiB
C
211 lines
5.3 KiB
C
/*-*- Mode: C; c-basic-offset: 8 -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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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 General Public License as published by
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the Free Software Foundation; either version 2 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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General Public License for more details.
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You should have received a copy of the GNU 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 <utmpx.h>
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#include <errno.h>
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#include <assert.h>
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#include <string.h>
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#include <sys/utsname.h>
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#include "macro.h"
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#include "utmp-wtmp.h"
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int utmp_get_runlevel(int *runlevel, int *previous) {
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struct utmpx lookup, *found;
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int r;
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const char *e;
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assert(runlevel);
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/* If these values are set in the environment this takes
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* precedence. Presumably, sysvinit does this to work around a
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* race condition that would otherwise exist where we'd always
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* go to disk and hence might read runlevel data that might be
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* very new and does not apply to the current script being
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* executed. */
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if ((e = getenv("RUNLEVEL")) && e[0] > 0) {
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*runlevel = e[0];
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if (previous) {
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/* $PREVLEVEL seems to be an Upstart thing */
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if ((e = getenv("PREVLEVEL")) && e[0] > 0)
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*previous = e[0];
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else
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*previous = 0;
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}
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return 0;
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}
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if (utmpxname(_PATH_UTMPX) < 0)
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return -errno;
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setutxent();
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zero(lookup);
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lookup.ut_type = RUN_LVL;
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if (!(found = getutxid(&lookup)))
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r = -errno;
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else {
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int a, b;
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a = found->ut_pid & 0xFF;
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b = (found->ut_pid >> 8) & 0xFF;
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if (a < 0 || b < 0)
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r = -EIO;
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else {
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*runlevel = a;
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if (previous)
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*previous = b;
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r = 0;
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}
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}
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endutxent();
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return r;
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}
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static void init_entry(struct utmpx *store, usec_t timestamp) {
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struct utsname uts;
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assert(store);
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zero(*store);
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zero(uts);
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if (timestamp <= 0)
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timestamp = now(CLOCK_REALTIME);
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store->ut_tv.tv_sec = timestamp / USEC_PER_SEC;
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store->ut_tv.tv_usec = timestamp % USEC_PER_SEC;
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if (uname(&uts) >= 0)
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strncpy(store->ut_host, uts.release, sizeof(store->ut_host));
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strncpy(store->ut_line, "~", sizeof(store->ut_line)); /* or ~~ ? */
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strncpy(store->ut_id, "~~", sizeof(store->ut_id));
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}
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static int write_entry_utmp(const struct utmpx *store) {
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int r;
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assert(store);
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/* utmp is similar to wtmp, but there is only one entry for
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* each entry type resp. user; i.e. basically a key/value
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* table. */
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if (utmpxname(_PATH_UTMPX) < 0)
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return -errno;
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setutxent();
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if (!pututxline(store))
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r = -errno;
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else
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r = 0;
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endutxent();
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return r;
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}
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static int write_entry_wtmp(const struct utmpx *store) {
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assert(store);
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/* wtmp is a simple append-only file where each entry is
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simply appended to * the end; i.e. basically a log. */
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errno = 0;
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updwtmpx(_PATH_WTMPX, store);
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return -errno;
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}
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static int write_entry_both(const struct utmpx *store) {
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int r, s;
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r = write_entry_utmp(store);
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s = write_entry_wtmp(store);
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if (r >= 0)
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r = s;
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/* If utmp/wtmp have been disabled, that's a good thing, hence
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* ignore the errors */
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if (r == -ENOENT)
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r = 0;
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return r;
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}
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int utmp_put_shutdown(usec_t timestamp) {
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struct utmpx store;
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init_entry(&store, timestamp);
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store.ut_type = RUN_LVL;
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strncpy(store.ut_user, "shutdown", sizeof(store.ut_user));
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return write_entry_both(&store);
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}
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int utmp_put_reboot(usec_t timestamp) {
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struct utmpx store;
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init_entry(&store, timestamp);
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store.ut_type = BOOT_TIME;
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strncpy(store.ut_user, "reboot", sizeof(store.ut_type));
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return write_entry_both(&store);
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}
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int utmp_put_runlevel(usec_t timestamp, int runlevel, int previous) {
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struct utmpx store;
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int r;
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assert(runlevel > 0);
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if (previous <= 0) {
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/* Find the old runlevel automatically */
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if ((r = utmp_get_runlevel(&previous, NULL)) < 0)
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return r;
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if (previous == runlevel)
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return 0;
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}
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init_entry(&store, timestamp);
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store.ut_type = RUN_LVL;
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store.ut_pid = (runlevel & 0xFF) | ((previous & 0xFF) << 8);
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strncpy(store.ut_user, "runlevel", sizeof(store.ut_user));
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return write_entry_both(&store);
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}
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