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git.ipfire.org Git - thirdparty/systemd.git/blob - src/utmp-wtmp.c
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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>
32 #include "utmp-wtmp.h"
34 int utmp_get_runlevel(int *runlevel
, int *previous
) {
35 struct utmpx lookup
, *found
;
41 /* If these values are set in the environment this takes
42 * precedence. Presumably, sysvinit does this to work around a
43 * race condition that would otherwise exist where we'd always
44 * go to disk and hence might read runlevel data that might be
45 * very new and does not apply to the current script being
48 if ((e
= getenv("RUNLEVEL")) && e
[0] > 0) {
52 /* $PREVLEVEL seems to be an Upstart thing */
54 if ((e
= getenv("PREVLEVEL")) && e
[0] > 0)
63 if (utmpxname(_PATH_UTMPX
) < 0)
69 lookup
.ut_type
= RUN_LVL
;
71 if (!(found
= getutxid(&lookup
)))
76 a
= found
->ut_pid
& 0xFF;
77 b
= (found
->ut_pid
>> 8) & 0xFF;
95 static void init_entry(struct utmpx
*store
, usec_t t
) {
104 t
= now(CLOCK_REALTIME
);
106 store
->ut_tv
.tv_sec
= t
/ USEC_PER_SEC
;
107 store
->ut_tv
.tv_usec
= t
% USEC_PER_SEC
;
109 if (uname(&uts
) >= 0)
110 strncpy(store
->ut_host
, uts
.release
, sizeof(store
->ut_host
));
112 strncpy(store
->ut_line
, "~", sizeof(store
->ut_line
)); /* or ~~ ? */
113 strncpy(store
->ut_id
, "~~", sizeof(store
->ut_id
));
116 static int write_entry_utmp(const struct utmpx
*store
) {
121 /* utmp is similar to wtmp, but there is only one entry for
122 * each entry type resp. user; i.e. basically a key/value
125 if (utmpxname(_PATH_UTMPX
) < 0)
130 if (!pututxline(store
))
140 static int write_entry_wtmp(const struct utmpx
*store
) {
143 /* wtmp is a simple append-only file where each entry is
144 simply appended to * the end; i.e. basically a log. */
147 updwtmpx(_PATH_WTMPX
, store
);
151 static int write_entry_both(const struct utmpx
*store
) {
154 r
= write_entry_utmp(store
);
155 s
= write_entry_wtmp(store
);
160 /* If utmp/wtmp have been disabled, that's a good thing, hence
161 * ignore the errors */
168 int utmp_put_shutdown(usec_t t
) {
171 init_entry(&store
, t
);
173 store
.ut_type
= RUN_LVL
;
174 strncpy(store
.ut_user
, "shutdown", sizeof(store
.ut_user
));
176 return write_entry_both(&store
);
179 int utmp_put_reboot(usec_t t
) {
182 init_entry(&store
, t
);
184 store
.ut_type
= BOOT_TIME
;
185 strncpy(store
.ut_user
, "reboot", sizeof(store
.ut_user
));
187 return write_entry_both(&store
);
190 int utmp_put_runlevel(usec_t t
, int runlevel
, int previous
) {
194 assert(runlevel
> 0);
197 /* Find the old runlevel automatically */
199 if ((r
= utmp_get_runlevel(&previous
, NULL
)) < 0) {
207 if (previous
== runlevel
)
210 init_entry(&store
, t
);
212 store
.ut_type
= RUN_LVL
;
213 store
.ut_pid
= (runlevel
& 0xFF) | ((previous
& 0xFF) << 8);
214 strncpy(store
.ut_user
, "runlevel", sizeof(store
.ut_user
));
216 return write_entry_both(&store
);
219 #define TIMEOUT_MSEC 50
221 static int write_to_terminal(const char *tty
, const char *message
) {
230 if ((fd
= open(tty
, O_WRONLY
|O_NDELAY
|O_NOCTTY
|O_CLOEXEC
)) < 0)
239 left
= strlen(message
);
241 end
= now(CLOCK_MONOTONIC
) + TIMEOUT_MSEC
*USEC_PER_MSEC
;
245 struct pollfd pollfd
;
249 t
= now(CLOCK_MONOTONIC
);
258 pollfd
.events
= POLLOUT
;
260 if ((k
= poll(&pollfd
, 1, (end
- t
) / USEC_PER_MSEC
)) < 0)
268 if ((n
= write(fd
, p
, left
)) < 0) {
277 assert((size_t) n
<= left
);
286 close_nointr_nofail(fd
);
291 int utmp_wall(const char *message
) {
293 char date
[FORMAT_TIMESTAMP_MAX
];
294 char *text
= NULL
, *hn
= NULL
, *un
= NULL
, *tty
= NULL
;
297 if (!(hn
= gethostname_malloc()) ||
298 !(un
= getlogname_malloc())) {
303 getttyname_malloc(&tty
);
307 "Broadcast message from %s@%s%s%s (%s):\r\n\r\n"
310 tty
? " on " : "", strempty(tty
),
311 format_timestamp(date
, sizeof(date
), now(CLOCK_REALTIME
)),
321 while ((u
= getutxent())) {
326 if (u
->ut_type
!= USER_PROCESS
|| u
->ut_user
[0] == 0)
329 if (path_startswith(u
->ut_line
, "/dev/"))
332 if (asprintf(&buf
, "/dev/%s", u
->ut_line
) < 0) {
340 if ((q
= write_to_terminal(path
, text
)) < 0)