diff options
Diffstat (limited to 'miscutils/last.c')
-rw-r--r-- | miscutils/last.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/miscutils/last.c b/miscutils/last.c new file mode 100644 index 000000000..668f0c17d --- /dev/null +++ b/miscutils/last.c | |||
@@ -0,0 +1,91 @@ | |||
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 "busybox.h" | ||
11 | #include <utmp.h> | ||
12 | |||
13 | #ifndef SHUTDOWN_TIME | ||
14 | # define SHUTDOWN_TIME 254 | ||
15 | #endif | ||
16 | |||
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. */ | ||
20 | |||
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! | ||
27 | #endif | ||
28 | |||
29 | int last_main(int argc, char **argv) | ||
30 | { | ||
31 | struct utmp ut; | ||
32 | int n, file = STDIN_FILENO; | ||
33 | time_t t_tmp; | ||
34 | |||
35 | if (argc > 1) { | ||
36 | bb_show_usage(); | ||
37 | } | ||
38 | file = xopen(bb_path_wtmp_file, O_RDONLY); | ||
39 | |||
40 | printf("%-10s %-14s %-18s %-12.12s %s\n", "USER", "TTY", "HOST", "LOGIN", "TIME"); | ||
41 | while ((n = safe_read(file, (void*)&ut, sizeof(struct utmp))) != 0) { | ||
42 | |||
43 | if (n != sizeof(struct utmp)) { | ||
44 | bb_perror_msg_and_die("short read"); | ||
45 | } | ||
46 | |||
47 | if (strncmp(ut.ut_line, "~", 1) == 0) { | ||
48 | if (strncmp(ut.ut_user, "shutdown", 8) == 0) | ||
49 | ut.ut_type = SHUTDOWN_TIME; | ||
50 | else if (strncmp(ut.ut_user, "reboot", 6) == 0) | ||
51 | ut.ut_type = BOOT_TIME; | ||
52 | else if (strncmp(ut.ut_user, "runlevel", 7) == 0) | ||
53 | ut.ut_type = RUN_LVL; | ||
54 | } else { | ||
55 | if (!ut.ut_name[0] || strcmp(ut.ut_name, "LOGIN") == 0 || | ||
56 | ut.ut_name[0] == 0) | ||
57 | { | ||
58 | /* Don't bother. This means we can't find how long | ||
59 | * someone was logged in for. Oh well. */ | ||
60 | continue; | ||
61 | } | ||
62 | if (ut.ut_type != DEAD_PROCESS && | ||
63 | ut.ut_name[0] && ut.ut_line[0]) | ||
64 | { | ||
65 | ut.ut_type = USER_PROCESS; | ||
66 | } | ||
67 | if (strcmp(ut.ut_name, "date") == 0) { | ||
68 | if (ut.ut_line[0] == '|') ut.ut_type = OLD_TIME; | ||
69 | if (ut.ut_line[0] == '{') ut.ut_type = NEW_TIME; | ||
70 | } | ||
71 | } | ||
72 | |||
73 | if (ut.ut_type!=USER_PROCESS) { | ||
74 | switch (ut.ut_type) { | ||
75 | case OLD_TIME: | ||
76 | case NEW_TIME: | ||
77 | case RUN_LVL: | ||
78 | case SHUTDOWN_TIME: | ||
79 | continue; | ||
80 | case BOOT_TIME: | ||
81 | strcpy(ut.ut_line, "system boot"); | ||
82 | break; | ||
83 | } | ||
84 | } | ||
85 | t_tmp = (time_t)ut.ut_tv.tv_sec; | ||
86 | printf("%-10s %-14s %-18s %-12.12s\n", ut.ut_user, ut.ut_line, ut.ut_host, | ||
87 | ctime(&t_tmp) + 4); | ||
88 | } | ||
89 | |||
90 | fflush_stdout_and_exit(EXIT_SUCCESS); | ||
91 | } | ||