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    Annotation of /trunk/mkinitrd-magellan/busybox/miscutils/last.c

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    Revision 984 - (hide annotations) (download)
    Sun May 30 11:32:42 2010 UTC (14 years ago) by niro
    File MIME type: text/plain
    File size: 3724 byte(s) 
    -updated to busybox-1.16.1 and enabled blkid/uuid support in default config
    1 niro 532 /* 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 niro 816 #include "libbb.h"
    11 niro 532 #include <utmp.h>
    12    
    13 niro 816 /* NB: ut_name and ut_user are the same field, use only one name (ut_user)
    14     * to reduce confusion */
    15    
    16 niro 532 #ifndef SHUTDOWN_TIME
    17     # define SHUTDOWN_TIME 254
    18     #endif
    19    
    20 niro 816 /* Grr... utmp char[] members do not have to be nul-terminated.
    21 niro 532 * 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 niro 816 #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 niro 984 int last_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
    39 niro 532 {
    40     struct utmp ut;
    41     int n, file = STDIN_FILENO;
    42     time_t t_tmp;
    43 niro 816 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 niro 532
    59 niro 984 if (argv[1]) {
    60 niro 532 bb_show_usage();
    61     }
    62     file = xopen(bb_path_wtmp_file, O_RDONLY);
    63    
    64 niro 816 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 niro 532 bb_perror_msg_and_die("short read");
    72     }
    73 niro 816 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 niro 532 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 niro 816 else if (strncmp(ut.ut_user, "runlevel", 8) == 0)
    86 niro 532 ut.ut_type = RUN_LVL;
    87 niro 816 #endif
    88 niro 532 } else {
    89 niro 816 if (ut.ut_user[0] == '\0' || strcmp(ut.ut_user, "LOGIN") == 0) {
    90 niro 532 /* Don't bother. This means we can't find how long
    91     * someone was logged in for. Oh well. */
    92 niro 816 goto next;
    93 niro 532 }
    94 niro 816 if (ut.ut_type != DEAD_PROCESS
    95     && ut.ut_user[0] && ut.ut_line[0]
    96     ) {
    97 niro 532 ut.ut_type = USER_PROCESS;
    98     }
    99 niro 816 if (strcmp(ut.ut_user, "date") == 0) {
    100     if (n == TYPE_OLD_TIME) { /* '|' */
    101     ut.ut_type = OLD_TIME;
    102     }
    103     if (n == TYPE_NEW_TIME) { /* '{' */
    104     ut.ut_type = NEW_TIME;
    105     }
    106 niro 532 }
    107     }
    108    
    109 niro 816 if (ut.ut_type != USER_PROCESS) {
    110 niro 532 switch (ut.ut_type) {
    111     case OLD_TIME:
    112     case NEW_TIME:
    113     case RUN_LVL:
    114     case SHUTDOWN_TIME:
    115 niro 816 goto next;
    116 niro 532 case BOOT_TIME:
    117     strcpy(ut.ut_line, "system boot");
    118     }
    119     }
    120 niro 816 /* manpages say ut_tv.tv_sec *is* time_t,
    121     * but some systems have it wrong */
    122 niro 532 t_tmp = (time_t)ut.ut_tv.tv_sec;
    123 niro 816 printf("%-10s %-14s %-18s %-12.12s\n",
    124     ut.ut_user, ut.ut_line, ut.ut_host, ctime(&t_tmp) + 4);
    125     next:
    126     pos -= sizeof(ut);
    127     if (pos <= 0)
    128     break; /* done. */
    129     xlseek(file, pos, SEEK_SET);
    130 niro 532 }
    131    
    132     fflush_stdout_and_exit(EXIT_SUCCESS);
    133     }