source: branches/2.2.2/mindi-busybox/miscutils/last.c @ 1247

Last change on this file since 1247 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 2.5 KB
Line 
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 v2 or later, see the file LICENSE in this tarball.
8 */
9
10#include "busybox.h"
11#include <sys/types.h>
12#include <fcntl.h>
13#include <unistd.h>
14#include <stdlib.h>
15#include <utmp.h>
16#include <sys/stat.h>
17#include <errno.h>
18#include <string.h>
19#include <time.h>
20
21#ifndef SHUTDOWN_TIME
22#  define SHUTDOWN_TIME 254
23#endif
24
25/* Grr... utmp char[] members  do not have to be nul-terminated.
26 * Do what we can while still keeping this reasonably small.
27 * Note: We are assuming the ut_id[] size is fixed at 4. */
28
29#if defined UT_LINESIZE \
30    && ((UT_LINESIZE != 32) || (UT_NAMESIZE != 32) || (UT_HOSTSIZE != 256))
31#error struct utmp member char[] size(s) have changed!
32#elif defined __UT_LINESIZE \
33    && ((__UT_LINESIZE != 32) || (__UT_NAMESIZE != 64) || (__UT_HOSTSIZE != 256))
34#error struct utmp member char[] size(s) have changed!
35#endif
36
37int last_main(int argc, char **argv)
38{
39    struct utmp ut;
40    int n, file = STDIN_FILENO;
41    time_t t_tmp;
42
43    if (argc > 1) {
44        bb_show_usage();
45    }
46    file = bb_xopen(bb_path_wtmp_file, O_RDONLY);
47
48    printf("%-10s %-14s %-18s %-12.12s %s\n", "USER", "TTY", "HOST", "LOGIN", "TIME");
49    while ((n = safe_read(file, (void*)&ut, sizeof(struct utmp))) != 0) {
50
51        if (n != sizeof(struct utmp)) {
52            bb_perror_msg_and_die("short read");
53        }
54
55        if (strncmp(ut.ut_line, "~", 1) == 0) {
56            if (strncmp(ut.ut_user, "shutdown", 8) == 0)
57                ut.ut_type = SHUTDOWN_TIME;
58            else if (strncmp(ut.ut_user, "reboot", 6) == 0)
59                ut.ut_type = BOOT_TIME;
60            else if (strncmp(ut.ut_user, "runlevel", 7) == 0)
61                ut.ut_type = RUN_LVL;
62        } else {
63            if (!ut.ut_name[0] || strcmp(ut.ut_name, "LOGIN") == 0 ||
64                    ut.ut_name[0] == 0)
65            {
66                /* Don't bother.  This means we can't find how long
67                 * someone was logged in for.  Oh well. */
68                continue;
69            }
70            if (ut.ut_type != DEAD_PROCESS &&
71                    ut.ut_name[0] && ut.ut_line[0])
72            {
73                ut.ut_type = USER_PROCESS;
74            }
75            if (strcmp(ut.ut_name, "date") == 0) {
76                if (ut.ut_line[0] == '|') ut.ut_type = OLD_TIME;
77                if (ut.ut_line[0] == '{') ut.ut_type = NEW_TIME;
78            }
79        }
80
81        if (ut.ut_type!=USER_PROCESS) {
82            switch (ut.ut_type) {
83                case OLD_TIME:
84                case NEW_TIME:
85                case RUN_LVL:
86                case SHUTDOWN_TIME:
87                    continue;
88                case BOOT_TIME:
89                    strcpy(ut.ut_line, "system boot");
90                    break;
91            }
92        }
93        t_tmp = (time_t)ut.ut_tv.tv_sec;
94        printf("%-10s %-14s %-18s %-12.12s\n", ut.ut_user, ut.ut_line, ut.ut_host,
95                ctime(&t_tmp) + 4);
96    }
97
98    bb_fflush_stdout_and_exit(EXIT_SUCCESS);
99}
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