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