1 /* vi: set sw=4 ts=4: */
3 * (sysvinit like) last implementation
5 * Copyright (C) 2008 by Patricia Muscalu <patricia.muscalu@axis.com>
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
12 /* NB: ut_name and ut_user are the same field, use only one name (ut_user)
13 * to reduce confusion */
16 # define SHUTDOWN_TIME 254
19 #define HEADER_FORMAT "%-8.8s %-12.12s %-*.*s %-16.16s %-7.7s %s\n"
20 #define HEADER_LINE "USER", "TTY", \
21 INET_ADDRSTRLEN, INET_ADDRSTRLEN, "HOST", "LOGIN", " TIME", ""
22 #define HEADER_LINE_WIDE "USER", "TTY", \
23 INET6_ADDRSTRLEN, INET6_ADDRSTRLEN, "HOST", "LOGIN", " TIME", ""
35 LAST_OPT_W
= (1 << 0), /* -W wide */
36 LAST_OPT_f
= (1 << 1), /* -f input file */
37 LAST_OPT_H
= (1 << 2), /* -H header */
40 #define show_wide (option_mask32 & LAST_OPT_W)
42 static void show_entry(struct utmp
*ut
, int state
, time_t dur_secs
)
44 unsigned days
, hours
, mins
;
48 const char *logout_str
;
49 const char *duration_str
;
52 /* manpages say ut_tv.tv_sec *is* time_t,
53 * but some systems have it wrong */
54 tmp
= ut
->ut_tv
.tv_sec
;
55 safe_strncpy(login_time
, ctime(&tmp
), 17);
56 snprintf(logout_time
, 8, "- %s", ctime(&dur_secs
) + 11);
58 dur_secs
= MAX(dur_secs
- (time_t)ut
->ut_tv
.tv_sec
, (time_t)0);
59 /* unsigned int is easier to divide than time_t (which may be signed long) */
61 days
= mins
/ (24*60);
62 mins
= mins
% (24*60);
67 sprintf(duration
, "(%u+%02u:%02u)", days
, hours
, mins
);
69 // sprintf(duration, " (%02u:%02u)", hours, mins);
72 logout_str
= logout_time
;
73 duration_str
= duration
;
78 logout_str
= " still";
79 duration_str
= "logged in";
82 logout_str
= "- down ";
87 logout_str
= "- crash";
91 duration_str
= "- no logout";
98 show_wide
? INET6_ADDRSTRLEN
: INET_ADDRSTRLEN
,
99 show_wide
? INET6_ADDRSTRLEN
: INET_ADDRSTRLEN
,
106 static int get_ut_type(struct utmp
*ut
)
108 if (ut
->ut_line
[0] == '~') {
109 if (strcmp(ut
->ut_user
, "shutdown") == 0) {
110 return SHUTDOWN_TIME
;
112 if (strcmp(ut
->ut_user
, "reboot") == 0) {
115 if (strcmp(ut
->ut_user
, "runlevel") == 0) {
121 if (ut
->ut_user
[0] == 0) {
125 if ((ut
->ut_type
!= DEAD_PROCESS
)
126 && (strcmp(ut
->ut_user
, "LOGIN") != 0)
130 ut
->ut_type
= USER_PROCESS
;
133 if (strcmp(ut
->ut_user
, "date") == 0) {
134 if (ut
->ut_line
[0] == '|') {
137 if (ut
->ut_line
[0] == '{') {
144 static int is_runlevel_shutdown(struct utmp
*ut
)
146 if (((ut
->ut_pid
& 255) == '0') || ((ut
->ut_pid
& 255) == '6')) {
153 int last_main(int argc
, char **argv
) MAIN_EXTERNALLY_VISIBLE
;
154 int last_main(int argc UNUSED_PARAM
, char **argv
)
157 const char *filename
= _PATH_WTMP
;
167 /*opt =*/ getopt32(argv
, "Wf:" /* "H" */, &filename
);
168 #ifdef BUT_UTIL_LINUX_LAST_HAS_NO_SUCH_OPT
169 if (opt
& LAST_OPT_H
) {
170 /* Print header line */
171 if (opt
& LAST_OPT_W
) {
172 printf(HEADER_FORMAT
, HEADER_LINE_WIDE
);
174 printf(HEADER_FORMAT
, HEADER_LINE
);
179 file
= xopen(filename
, O_RDONLY
);
181 /* in case the file is empty... */
184 start_time
= st
.st_ctime
;
189 boot_down
= NORMAL
; /* 0 */
192 /* get file size, rounding down to last full record */
193 pos
= xlseek(file
, 0, SEEK_END
) / sizeof(ut
) * sizeof(ut
);
195 pos
-= (off_t
)sizeof(ut
);
197 /* Beyond the beginning of the file boundary =>
198 * the whole file has been read. */
201 xlseek(file
, pos
, SEEK_SET
);
202 xread(file
, &ut
, sizeof(ut
));
203 /* rewritten by each record, eventially will have
204 * first record's ut_tv.tv_sec: */
205 start_time
= ut
.ut_tv
.tv_sec
;
207 switch (get_ut_type(&ut
)) {
209 down_time
= ut
.ut_tv
.tv_sec
;
214 if (is_runlevel_shutdown(&ut
)) {
215 down_time
= ut
.ut_tv
.tv_sec
;
221 strcpy(ut
.ut_line
, "system boot");
222 show_entry(&ut
, REBOOT
, down_time
);
227 if (!ut
.ut_line
[0]) {
231 llist_add_to(&zlist
, memcpy(xmalloc(sizeof(ut
)), &ut
, sizeof(ut
)));
236 if (!ut
.ut_line
[0]) {
243 for (el
= zlist
; el
; el
= next
) {
244 struct utmp
*up
= (struct utmp
*)el
->data
;
246 if (strncmp(up
->ut_line
, ut
.ut_line
, UT_LINESIZE
) == 0) {
248 show_entry(&ut
, NORMAL
, up
->ut_tv
.tv_sec
);
251 llist_unlink(&zlist
, el
);
259 int state
= boot_down
;
261 if (boot_time
== 0) {
263 /* Check if the process is alive */
265 && (kill(ut
.ut_pid
, 0) != 0)
266 && (errno
== ESRCH
)) {
270 show_entry(&ut
, state
, boot_time
);
273 llist_add_to(&zlist
, memcpy(xmalloc(sizeof(ut
)), &ut
, sizeof(ut
)));
279 boot_time
= ut
.ut_tv
.tv_sec
;
280 llist_free(zlist
, free
);
286 if (ENABLE_FEATURE_CLEAN_UP
) {
287 llist_free(zlist
, free
);
290 printf("\nwtmp begins %s", ctime(&start_time
));
292 if (ENABLE_FEATURE_CLEAN_UP
)
294 fflush_stdout_and_exit(EXIT_SUCCESS
);