Contents of /tags/mkinitrd-6_3_1/busybox/miscutils/last.c
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Wed Aug 18 21:56:57 2010 UTC (14 years, 1 month ago) by niro
Original Path: trunk/mkinitrd-magellan/busybox/miscutils/last.c
File MIME type: text/plain
File size: 3728 byte(s)
Wed Aug 18 21:56:57 2010 UTC (14 years, 1 month ago) by niro
Original Path: trunk/mkinitrd-magellan/busybox/miscutils/last.c
File MIME type: text/plain
File size: 3728 byte(s)
-updated to busybox-1.17.1
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * last implementation for busybox |
4 | * |
5 | * Copyright (C) 2003-2004 by Erik Andersen <andersen@codepoet.org> |
6 | * |
7 | * Licensed under the GPL version 2, see the file LICENSE in this tarball. |
8 | */ |
9 | |
10 | #include "libbb.h" |
11 | #include <utmp.h> |
12 | |
13 | /* NB: ut_name and ut_user are the same field, use only one name (ut_user) |
14 | * to reduce confusion */ |
15 | |
16 | #ifndef SHUTDOWN_TIME |
17 | # define SHUTDOWN_TIME 254 |
18 | #endif |
19 | |
20 | /* Grr... utmp char[] members do not have to be nul-terminated. |
21 | * Do what we can while still keeping this reasonably small. |
22 | * Note: We are assuming the ut_id[] size is fixed at 4. */ |
23 | |
24 | #if defined UT_LINESIZE \ |
25 | && ((UT_LINESIZE != 32) || (UT_NAMESIZE != 32) || (UT_HOSTSIZE != 256)) |
26 | #error struct utmp member char[] size(s) have changed! |
27 | #elif defined __UT_LINESIZE \ |
28 | && ((__UT_LINESIZE != 32) || (__UT_NAMESIZE != 64) || (__UT_HOSTSIZE != 256)) |
29 | #error struct utmp member char[] size(s) have changed! |
30 | #endif |
31 | |
32 | #if EMPTY != 0 || RUN_LVL != 1 || BOOT_TIME != 2 || NEW_TIME != 3 || \ |
33 | OLD_TIME != 4 |
34 | #error Values for the ut_type field of struct utmp changed |
35 | #endif |
36 | |
37 | int last_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
38 | int last_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
39 | { |
40 | struct utmp ut; |
41 | int n, file = STDIN_FILENO; |
42 | time_t t_tmp; |
43 | off_t pos; |
44 | static const char _ut_usr[] ALIGN1 = |
45 | "runlevel\0" "reboot\0" "shutdown\0"; |
46 | static const char _ut_lin[] ALIGN1 = |
47 | "~\0" "{\0" "|\0" /* "LOGIN\0" "date\0" */; |
48 | enum { |
49 | TYPE_RUN_LVL = RUN_LVL, /* 1 */ |
50 | TYPE_BOOT_TIME = BOOT_TIME, /* 2 */ |
51 | TYPE_SHUTDOWN_TIME = SHUTDOWN_TIME |
52 | }; |
53 | enum { |
54 | _TILDE = EMPTY, /* 0 */ |
55 | TYPE_NEW_TIME, /* NEW_TIME, 3 */ |
56 | TYPE_OLD_TIME /* OLD_TIME, 4 */ |
57 | }; |
58 | |
59 | if (argv[1]) { |
60 | bb_show_usage(); |
61 | } |
62 | file = xopen(bb_path_wtmp_file, O_RDONLY); |
63 | |
64 | printf("%-10s %-14s %-18s %-12.12s %s\n", |
65 | "USER", "TTY", "HOST", "LOGIN", "TIME"); |
66 | /* yikes. We reverse over the file and that is a not too elegant way */ |
67 | pos = xlseek(file, 0, SEEK_END); |
68 | pos = lseek(file, pos - sizeof(ut), SEEK_SET); |
69 | while ((n = full_read(file, &ut, sizeof(ut))) > 0) { |
70 | if (n != sizeof(ut)) { |
71 | bb_perror_msg_and_die("short read"); |
72 | } |
73 | n = index_in_strings(_ut_lin, ut.ut_line); |
74 | if (n == _TILDE) { /* '~' */ |
75 | #if 1 |
76 | /* do we really need to be cautious here? */ |
77 | n = index_in_strings(_ut_usr, ut.ut_user); |
78 | if (++n > 0) |
79 | ut.ut_type = n != 3 ? n : SHUTDOWN_TIME; |
80 | #else |
81 | if (strncmp(ut.ut_user, "shutdown", 8) == 0) |
82 | ut.ut_type = SHUTDOWN_TIME; |
83 | else if (strncmp(ut.ut_user, "reboot", 6) == 0) |
84 | ut.ut_type = BOOT_TIME; |
85 | else if (strncmp(ut.ut_user, "runlevel", 8) == 0) |
86 | ut.ut_type = RUN_LVL; |
87 | #endif |
88 | } else { |
89 | if (ut.ut_user[0] == '\0' || strcmp(ut.ut_user, "LOGIN") == 0) { |
90 | /* Don't bother. This means we can't find how long |
91 | * someone was logged in for. Oh well. */ |
92 | goto next; |
93 | } |
94 | if (ut.ut_type != DEAD_PROCESS |
95 | && ut.ut_user[0] |
96 | && ut.ut_line[0] |
97 | ) { |
98 | ut.ut_type = USER_PROCESS; |
99 | } |
100 | if (strcmp(ut.ut_user, "date") == 0) { |
101 | if (n == TYPE_OLD_TIME) { /* '|' */ |
102 | ut.ut_type = OLD_TIME; |
103 | } |
104 | if (n == TYPE_NEW_TIME) { /* '{' */ |
105 | ut.ut_type = NEW_TIME; |
106 | } |
107 | } |
108 | } |
109 | |
110 | if (ut.ut_type != USER_PROCESS) { |
111 | switch (ut.ut_type) { |
112 | case OLD_TIME: |
113 | case NEW_TIME: |
114 | case RUN_LVL: |
115 | case SHUTDOWN_TIME: |
116 | goto next; |
117 | case BOOT_TIME: |
118 | strcpy(ut.ut_line, "system boot"); |
119 | } |
120 | } |
121 | /* manpages say ut_tv.tv_sec *is* time_t, |
122 | * but some systems have it wrong */ |
123 | t_tmp = (time_t)ut.ut_tv.tv_sec; |
124 | printf("%-10s %-14s %-18s %-12.12s\n", |
125 | ut.ut_user, ut.ut_line, ut.ut_host, ctime(&t_tmp) + 4); |
126 | next: |
127 | pos -= sizeof(ut); |
128 | if (pos <= 0) |
129 | break; /* done. */ |
130 | xlseek(file, pos, SEEK_SET); |
131 | } |
132 | |
133 | fflush_stdout_and_exit(EXIT_SUCCESS); |
134 | } |