1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * (sysvinit like) last implementation
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4 | *
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5 | * Copyright (C) 2008 by Patricia Muscalu <patricia.muscalu@axis.com>
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6 | *
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7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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8 | */
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9 |
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10 | #include "libbb.h"
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11 |
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12 | /* NB: ut_name and ut_user are the same field, use only one name (ut_user)
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13 | * to reduce confusion */
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14 |
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15 | #ifndef SHUTDOWN_TIME
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16 | # define SHUTDOWN_TIME 254
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17 | #endif
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18 |
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19 | #define HEADER_FORMAT "%-8.8s %-12.12s %-*.*s %-16.16s %-7.7s %s\n"
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20 | #define HEADER_LINE "USER", "TTY", \
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21 | INET_ADDRSTRLEN, INET_ADDRSTRLEN, "HOST", "LOGIN", " TIME", ""
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22 | #define HEADER_LINE_WIDE "USER", "TTY", \
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23 | INET6_ADDRSTRLEN, INET6_ADDRSTRLEN, "HOST", "LOGIN", " TIME", ""
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24 |
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25 | #if !defined __UT_LINESIZE && defined UT_LINESIZE
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26 | # define __UT_LINESIZE UT_LINESIZE
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27 | #endif
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28 |
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29 | enum {
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30 | NORMAL,
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31 | LOGGED,
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32 | DOWN,
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33 | REBOOT,
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34 | CRASH,
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35 | GONE
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36 | };
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37 |
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38 | enum {
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39 | LAST_OPT_W = (1 << 0), /* -W wide */
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40 | LAST_OPT_f = (1 << 1), /* -f input file */
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41 | LAST_OPT_H = (1 << 2), /* -H header */
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42 | };
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43 |
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44 | #define show_wide (option_mask32 & LAST_OPT_W)
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45 |
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46 | static void show_entry(struct utmpx *ut, int state, time_t dur_secs)
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47 | {
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48 | unsigned days, hours, mins;
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49 | char duration[sizeof("(%u+02:02)") + sizeof(int)*3];
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50 | char login_time[17];
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51 | char logout_time[8];
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52 | const char *logout_str;
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53 | const char *duration_str;
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54 | time_t tmp;
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55 |
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56 | /* manpages say ut_tv.tv_sec *is* time_t,
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57 | * but some systems have it wrong */
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58 | tmp = ut->ut_tv.tv_sec;
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59 | safe_strncpy(login_time, ctime(&tmp), 17);
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60 | tmp = dur_secs;
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61 | snprintf(logout_time, 8, "- %s", ctime(&tmp) + 11);
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62 |
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63 | dur_secs = MAX(dur_secs - (time_t)ut->ut_tv.tv_sec, (time_t)0);
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64 | /* unsigned int is easier to divide than time_t (which may be signed long) */
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65 | mins = dur_secs / 60;
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66 | days = mins / (24*60);
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67 | mins = mins % (24*60);
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68 | hours = mins / 60;
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69 | mins = mins % 60;
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70 |
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71 | // if (days) {
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72 | sprintf(duration, "(%u+%02u:%02u)", days, hours, mins);
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73 | // } else {
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74 | // sprintf(duration, " (%02u:%02u)", hours, mins);
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75 | // }
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76 |
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77 | logout_str = logout_time;
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78 | duration_str = duration;
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79 | switch (state) {
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80 | case NORMAL:
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81 | break;
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82 | case LOGGED:
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83 | logout_str = " still";
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84 | duration_str = "logged in";
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85 | break;
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86 | case DOWN:
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87 | logout_str = "- down ";
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88 | break;
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89 | case REBOOT:
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90 | break;
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91 | case CRASH:
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92 | logout_str = "- crash";
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93 | break;
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94 | case GONE:
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95 | logout_str = " gone";
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96 | duration_str = "- no logout";
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97 | break;
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98 | }
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99 |
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100 | printf(HEADER_FORMAT,
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101 | ut->ut_user,
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102 | ut->ut_line,
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103 | show_wide ? INET6_ADDRSTRLEN : INET_ADDRSTRLEN,
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104 | show_wide ? INET6_ADDRSTRLEN : INET_ADDRSTRLEN,
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105 | ut->ut_host,
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106 | login_time,
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107 | logout_str,
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108 | duration_str);
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109 | }
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110 |
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111 | static int get_ut_type(struct utmpx *ut)
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112 | {
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113 | if (ut->ut_line[0] == '~') {
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114 | if (strcmp(ut->ut_user, "shutdown") == 0) {
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115 | return SHUTDOWN_TIME;
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116 | }
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117 | if (strcmp(ut->ut_user, "reboot") == 0) {
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118 | return BOOT_TIME;
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119 | }
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120 | if (strcmp(ut->ut_user, "runlevel") == 0) {
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121 | return RUN_LVL;
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122 | }
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123 | return ut->ut_type;
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124 | }
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125 |
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126 | if (ut->ut_user[0] == 0) {
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127 | return DEAD_PROCESS;
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128 | }
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129 |
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130 | if ((ut->ut_type != DEAD_PROCESS)
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131 | && (strcmp(ut->ut_user, "LOGIN") != 0)
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132 | && ut->ut_user[0]
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133 | && ut->ut_line[0]
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134 | ) {
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135 | ut->ut_type = USER_PROCESS;
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136 | }
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137 |
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138 | if (strcmp(ut->ut_user, "date") == 0) {
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139 | if (ut->ut_line[0] == '|') {
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140 | return OLD_TIME;
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141 | }
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142 | if (ut->ut_line[0] == '{') {
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143 | return NEW_TIME;
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144 | }
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145 | }
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146 | return ut->ut_type;
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147 | }
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148 |
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149 | static int is_runlevel_shutdown(struct utmpx *ut)
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150 | {
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151 | if (((ut->ut_pid & 255) == '0') || ((ut->ut_pid & 255) == '6')) {
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152 | return 1;
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153 | }
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154 |
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155 | return 0;
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156 | }
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157 |
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158 | int last_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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159 | int last_main(int argc UNUSED_PARAM, char **argv)
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160 | {
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161 | struct utmpx ut;
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162 | const char *filename = _PATH_WTMP;
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163 | llist_t *zlist;
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164 | off_t pos;
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165 | time_t start_time;
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166 | time_t boot_time;
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167 | time_t down_time;
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168 | int file;
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169 | smallint going_down;
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170 | smallint boot_down;
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171 |
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172 | /*opt =*/ getopt32(argv, "Wf:" /* "H" */, &filename);
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173 | #ifdef BUT_UTIL_LINUX_LAST_HAS_NO_SUCH_OPT
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174 | if (opt & LAST_OPT_H) {
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175 | /* Print header line */
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176 | if (opt & LAST_OPT_W) {
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177 | printf(HEADER_FORMAT, HEADER_LINE_WIDE);
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178 | } else {
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179 | printf(HEADER_FORMAT, HEADER_LINE);
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180 | }
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181 | }
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182 | #endif
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183 |
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184 | file = xopen(filename, O_RDONLY);
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185 | {
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186 | /* in case the file is empty... */
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187 | struct stat st;
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188 | fstat(file, &st);
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189 | start_time = st.st_ctime;
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190 | }
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191 |
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192 | time(&down_time);
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193 | going_down = 0;
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194 | boot_down = NORMAL; /* 0 */
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195 | zlist = NULL;
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196 | boot_time = 0;
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197 | /* get file size, rounding down to last full record */
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198 | pos = xlseek(file, 0, SEEK_END) / sizeof(ut) * sizeof(ut);
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199 | for (;;) {
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200 | pos -= (off_t)sizeof(ut);
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201 | if (pos < 0) {
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202 | /* Beyond the beginning of the file boundary =>
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203 | * the whole file has been read. */
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204 | break;
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205 | }
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206 | xlseek(file, pos, SEEK_SET);
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207 | xread(file, &ut, sizeof(ut));
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208 | /* rewritten by each record, eventially will have
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209 | * first record's ut_tv.tv_sec: */
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210 | start_time = ut.ut_tv.tv_sec;
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211 |
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212 | switch (get_ut_type(&ut)) {
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213 | case SHUTDOWN_TIME:
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214 | down_time = ut.ut_tv.tv_sec;
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215 | boot_down = DOWN;
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216 | going_down = 1;
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217 | break;
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218 | case RUN_LVL:
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219 | if (is_runlevel_shutdown(&ut)) {
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220 | down_time = ut.ut_tv.tv_sec;
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221 | going_down = 1;
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222 | boot_down = DOWN;
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223 | }
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224 | break;
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225 | case BOOT_TIME:
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226 | strcpy(ut.ut_line, "system boot");
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227 | show_entry(&ut, REBOOT, down_time);
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228 | boot_down = CRASH;
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229 | going_down = 1;
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230 | break;
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231 | case DEAD_PROCESS:
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232 | if (!ut.ut_line[0]) {
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233 | break;
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234 | }
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235 | /* add_entry */
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236 | llist_add_to(&zlist, xmemdup(&ut, sizeof(ut)));
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237 | break;
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238 | case USER_PROCESS: {
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239 | int show;
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240 |
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241 | if (!ut.ut_line[0]) {
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242 | break;
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243 | }
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244 | /* find_entry */
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245 | show = 1;
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246 | {
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247 | llist_t *el, *next;
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248 | for (el = zlist; el; el = next) {
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249 | struct utmpx *up = (struct utmpx *)el->data;
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250 | next = el->link;
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251 | if (strncmp(up->ut_line, ut.ut_line, __UT_LINESIZE) == 0) {
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252 | if (show) {
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253 | show_entry(&ut, NORMAL, up->ut_tv.tv_sec);
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254 | show = 0;
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255 | }
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256 | llist_unlink(&zlist, el);
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257 | free(el->data);
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258 | free(el);
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259 | }
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260 | }
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261 | }
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262 |
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263 | if (show) {
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264 | int state = boot_down;
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265 |
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266 | if (boot_time == 0) {
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267 | state = LOGGED;
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268 | /* Check if the process is alive */
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269 | if ((ut.ut_pid > 0)
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270 | && (kill(ut.ut_pid, 0) != 0)
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271 | && (errno == ESRCH)) {
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272 | state = GONE;
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273 | }
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274 | }
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275 | show_entry(&ut, state, boot_time);
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276 | }
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277 | /* add_entry */
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278 | llist_add_to(&zlist, xmemdup(&ut, sizeof(ut)));
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279 | break;
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280 | }
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281 | }
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282 |
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283 | if (going_down) {
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284 | boot_time = ut.ut_tv.tv_sec;
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285 | llist_free(zlist, free);
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286 | zlist = NULL;
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287 | going_down = 0;
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288 | }
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289 | }
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290 |
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291 | if (ENABLE_FEATURE_CLEAN_UP) {
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292 | llist_free(zlist, free);
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293 | }
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294 |
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295 | printf("\nwtmp begins %s", ctime(&start_time));
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296 |
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297 | if (ENABLE_FEATURE_CLEAN_UP)
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298 | close(file);
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299 | fflush_stdout_and_exit(EXIT_SUCCESS);
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300 | }
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