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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_timestamp(struct utmpx
*store
, usec_t t
) {
101 t
= now(CLOCK_REALTIME
);
103 store
->ut_tv
.tv_sec
= t
/ USEC_PER_SEC
;
104 store
->ut_tv
.tv_usec
= t
% USEC_PER_SEC
;
107 static void init_entry(struct utmpx
*store
, usec_t t
) {
112 init_timestamp(store
, t
);
116 if (uname(&uts
) >= 0)
117 strncpy(store
->ut_host
, uts
.release
, sizeof(store
->ut_host
));
119 strncpy(store
->ut_line
, "~", sizeof(store
->ut_line
)); /* or ~~ ? */
120 strncpy(store
->ut_id
, "~~", sizeof(store
->ut_id
));
123 static int write_entry_utmp(const struct utmpx
*store
) {
128 /* utmp is similar to wtmp, but there is only one entry for
129 * each entry type resp. user; i.e. basically a key/value
132 if (utmpxname(_PATH_UTMPX
) < 0)
137 if (!pututxline(store
))
147 static int write_entry_wtmp(const struct utmpx
*store
) {
150 /* wtmp is a simple append-only file where each entry is
151 simply appended to * the end; i.e. basically a log. */
154 updwtmpx(_PATH_WTMPX
, store
);
158 static int write_entry_both(const struct utmpx
*store
) {
161 r
= write_entry_utmp(store
);
162 s
= write_entry_wtmp(store
);
167 /* If utmp/wtmp have been disabled, that's a good thing, hence
168 * ignore the errors */
175 int utmp_put_shutdown(void) {
178 init_entry(&store
, 0);
180 store
.ut_type
= RUN_LVL
;
181 strncpy(store
.ut_user
, "shutdown", sizeof(store
.ut_user
));
183 return write_entry_both(&store
);
186 int utmp_put_reboot(usec_t t
) {
189 init_entry(&store
, t
);
191 store
.ut_type
= BOOT_TIME
;
192 strncpy(store
.ut_user
, "reboot", sizeof(store
.ut_user
));
194 return write_entry_both(&store
);
197 static const char *sanitize_id(const char *id
) {
203 if (l
<= sizeof(((struct utmpx
*) NULL
)->ut_id
))
206 return id
+ l
- sizeof(((struct utmpx
*) NULL
)->ut_id
);
209 int utmp_put_init_process(const char *id
, pid_t pid
, pid_t sid
, const char *line
) {
214 init_timestamp(&store
, 0);
216 store
.ut_type
= INIT_PROCESS
;
218 store
.ut_session
= sid
;
220 strncpy(store
.ut_id
, sanitize_id(id
), sizeof(store
.ut_id
));
223 strncpy(store
.ut_line
, file_name_from_path(line
), sizeof(store
.ut_line
));
225 return write_entry_both(&store
);
228 int utmp_put_dead_process(const char *id
, pid_t pid
, int code
, int status
) {
229 struct utmpx lookup
, store
, *found
;
236 lookup
.ut_type
= INIT_PROCESS
; /* looks for DEAD_PROCESS, LOGIN_PROCESS, USER_PROCESS, too */
237 strncpy(lookup
.ut_id
, sanitize_id(id
), sizeof(lookup
.ut_id
));
239 if (!(found
= getutxid(&lookup
)))
242 if (found
->ut_pid
!= pid
)
245 memcpy(&store
, found
, sizeof(store
));
246 store
.ut_type
= DEAD_PROCESS
;
247 store
.ut_exit
.e_termination
= code
;
248 store
.ut_exit
.e_exit
= status
;
254 return write_entry_both(&store
);
258 int utmp_put_runlevel(int runlevel
, int previous
) {
262 assert(runlevel
> 0);
265 /* Find the old runlevel automatically */
267 if ((r
= utmp_get_runlevel(&previous
, NULL
)) < 0) {
275 if (previous
== runlevel
)
278 init_entry(&store
, 0);
280 store
.ut_type
= RUN_LVL
;
281 store
.ut_pid
= (runlevel
& 0xFF) | ((previous
& 0xFF) << 8);
282 strncpy(store
.ut_user
, "runlevel", sizeof(store
.ut_user
));
284 return write_entry_both(&store
);
287 #define TIMEOUT_MSEC 50
289 static int write_to_terminal(const char *tty
, const char *message
) {
298 if ((fd
= open(tty
, O_WRONLY
|O_NDELAY
|O_NOCTTY
|O_CLOEXEC
)) < 0)
307 left
= strlen(message
);
309 end
= now(CLOCK_MONOTONIC
) + TIMEOUT_MSEC
*USEC_PER_MSEC
;
313 struct pollfd pollfd
;
317 t
= now(CLOCK_MONOTONIC
);
326 pollfd
.events
= POLLOUT
;
328 if ((k
= poll(&pollfd
, 1, (end
- t
) / USEC_PER_MSEC
)) < 0)
336 if ((n
= write(fd
, p
, left
)) < 0) {
345 assert((size_t) n
<= left
);
354 close_nointr_nofail(fd
);
359 int utmp_wall(const char *message
, bool (*match_tty
)(const char *tty
)) {
361 char date
[FORMAT_TIMESTAMP_MAX
];
362 char *text
= NULL
, *hn
= NULL
, *un
= NULL
, *tty
= NULL
;
365 if (!(hn
= gethostname_malloc()) ||
366 !(un
= getlogname_malloc())) {
371 getttyname_harder(STDIN_FILENO
, &tty
);
375 "Broadcast message from %s@%s%s%s (%s):\r\n\r\n"
378 tty
? " on " : "", strempty(tty
),
379 format_timestamp(date
, sizeof(date
), now(CLOCK_REALTIME
)),
389 while ((u
= getutxent())) {
394 if (u
->ut_type
!= USER_PROCESS
|| u
->ut_user
[0] == 0)
397 if (path_startswith(u
->ut_line
, "/dev/"))
400 if (asprintf(&buf
, "/dev/%s", u
->ut_line
) < 0) {
408 if (!match_tty
|| match_tty(path
))
409 if ((q
= write_to_terminal(path
, text
)) < 0)