1 /* vi: set sw=4 ts=4: */
3 * last implementation for busybox
5 * Copyright (C) 2003-2004 by Erik Andersen <andersen@codepoet.org>
7 * Licensed under the GPL version 2, see the file LICENSE in this tarball.
14 # define SHUTDOWN_TIME 254
17 /* Grr... utmp char[] members do not have to be nul-terminated.
18 * Do what we can while still keeping this reasonably small.
19 * Note: We are assuming the ut_id[] size is fixed at 4. */
21 #if defined UT_LINESIZE \
22 && ((UT_LINESIZE != 32) || (UT_NAMESIZE != 32) || (UT_HOSTSIZE != 256))
23 #error struct utmp member char[] size(s) have changed!
24 #elif defined __UT_LINESIZE \
25 && ((__UT_LINESIZE != 32) || (__UT_NAMESIZE != 64) || (__UT_HOSTSIZE != 256))
26 #error struct utmp member char[] size(s) have changed!
29 #if EMPTY != 0 || RUN_LVL != 1 || BOOT_TIME != 2 || NEW_TIME != 3 || \
31 #error Values for the ut_type field of struct utmp changed
34 int last_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
35 int last_main(int argc, char **argv ATTRIBUTE_UNUSED)
38 int n, file = STDIN_FILENO;
41 static const char _ut_usr[] ALIGN1 =
42 "runlevel\0" "reboot\0" "shutdown\0";
43 static const char _ut_lin[] ALIGN1 =
44 "~\0" "{\0" "|\0" /* "LOGIN\0" "date\0" */;
46 TYPE_RUN_LVL = RUN_LVL, /* 1 */
47 TYPE_BOOT_TIME = BOOT_TIME, /* 2 */
48 TYPE_SHUTDOWN_TIME = SHUTDOWN_TIME
51 _TILDE = EMPTY, /* 0 */
52 TYPE_NEW_TIME, /* NEW_TIME, 3 */
53 TYPE_OLD_TIME /* OLD_TIME, 4 */
59 file = xopen(bb_path_wtmp_file, O_RDONLY);
61 printf("%-10s %-14s %-18s %-12.12s %s\n",
62 "USER", "TTY", "HOST", "LOGIN", "TIME");
63 /* yikes. We reverse over the file and that is a not too elegant way */
64 pos = xlseek(file, 0, SEEK_END);
65 pos = lseek(file, pos - sizeof(ut), SEEK_SET);
66 while ((n = full_read(file, &ut, sizeof(ut))) > 0) {
67 if (n != sizeof(ut)) {
68 bb_perror_msg_and_die("short read");
70 n = index_in_strings(_ut_lin, ut.ut_line);
71 if (n == _TILDE) { /* '~' */
73 /* do we really need to be cautious here? */
74 n = index_in_strings(_ut_usr, ut.ut_user);
78 if (strncmp(ut.ut_user, "shutdown", 8) == 0)
79 ut.ut_type = SHUTDOWN_TIME;
80 else if (strncmp(ut.ut_user, "reboot", 6) == 0)
81 ut.ut_type = BOOT_TIME;
82 else if (strncmp(ut.ut_user, "runlevel", 8) == 0)
86 if (ut.ut_name[0] == '\0' || strcmp(ut.ut_name, "LOGIN") == 0) {
87 /* Don't bother. This means we can't find how long
88 * someone was logged in for. Oh well. */
91 if (ut.ut_type != DEAD_PROCESS
92 && ut.ut_name[0] && ut.ut_line[0]
94 ut.ut_type = USER_PROCESS;
96 if (strcmp(ut.ut_name, "date") == 0) {
97 if (n == TYPE_OLD_TIME) { /* '|' */
98 ut.ut_type = OLD_TIME;
100 if (n == TYPE_NEW_TIME) { /* '{' */
101 ut.ut_type = NEW_TIME;
106 if (ut.ut_type != USER_PROCESS) {
107 switch (ut.ut_type) {
114 strcpy(ut.ut_line, "system boot");
117 t_tmp = (time_t)ut.ut_tv.tv_sec;
118 printf("%-10s %-14s %-18s %-12.12s\n",
119 ut.ut_user, ut.ut_line, ut.ut_host, ctime(&t_tmp) + 4);
123 pos = lseek(file, pos - sizeof(ut), SEEK_SET);
126 fflush_stdout_and_exit(EXIT_SUCCESS);