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

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    Revision 532 - (show annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
    File MIME type: text/plain
    File size: 2429 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    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 (ut.ut_line[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 }