1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini hwclock implementation for busybox
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4 | *
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5 | * Copyright (C) 2002 Robert Griebl <griebl@gmx.de>
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6 | *
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7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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8 | */
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9 |
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10 |
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11 | #include <sys/ioctl.h>
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12 | #include <sys/utsname.h>
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13 | #include <ctype.h>
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14 | #include <fcntl.h>
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15 | #include <getopt.h>
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16 | #include <stdlib.h>
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17 | #include <string.h>
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18 | #include <syslog.h>
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19 | #include <time.h>
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20 | #include <unistd.h>
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21 | #include "busybox.h"
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22 |
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23 | /* Copied from linux/rtc.h to eliminate the kernel dependency */
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24 | struct linux_rtc_time {
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25 | int tm_sec;
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26 | int tm_min;
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27 | int tm_hour;
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28 | int tm_mday;
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29 | int tm_mon;
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30 | int tm_year;
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31 | int tm_wday;
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32 | int tm_yday;
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33 | int tm_isdst;
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34 | };
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35 |
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36 | #define RTC_SET_TIME _IOW('p', 0x0a, struct linux_rtc_time) /* Set RTC time */
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37 | #define RTC_RD_TIME _IOR('p', 0x09, struct linux_rtc_time) /* Read RTC time */
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38 |
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39 | #if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS
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40 | # ifndef _GNU_SOURCE
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41 | # define _GNU_SOURCE
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42 | # endif
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43 | #endif
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44 |
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45 | static time_t read_rtc(int utc)
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46 | {
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47 | int rtc;
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48 | struct tm tm;
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49 | char *oldtz = 0;
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50 | time_t t = 0;
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51 |
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52 | if (( rtc = open ( "/dev/rtc", O_RDONLY )) < 0 ) {
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53 | if (( rtc = open ( "/dev/misc/rtc", O_RDONLY )) < 0 )
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54 | bb_perror_msg_and_die ( "Could not access RTC" );
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55 | }
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56 | memset ( &tm, 0, sizeof( struct tm ));
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57 | if ( ioctl ( rtc, RTC_RD_TIME, &tm ) < 0 )
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58 | bb_perror_msg_and_die ( "Could not read time from RTC" );
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59 | tm.tm_isdst = -1; /* not known */
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60 |
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61 | close ( rtc );
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62 |
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63 | if ( utc ) {
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64 | oldtz = getenv ( "TZ" );
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65 | setenv ( "TZ", "UTC 0", 1 );
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66 | tzset ( );
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67 | }
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68 |
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69 | t = mktime ( &tm );
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70 |
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71 | if ( utc ) {
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72 | if ( oldtz )
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73 | setenv ( "TZ", oldtz, 1 );
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74 | else
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75 | unsetenv ( "TZ" );
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76 | tzset ( );
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77 | }
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78 | return t;
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79 | }
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80 |
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81 | static void write_rtc(time_t t, int utc)
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82 | {
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83 | int rtc;
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84 | struct tm tm;
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85 |
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86 | if (( rtc = open ( "/dev/rtc", O_WRONLY )) < 0 ) {
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87 | if (( rtc = open ( "/dev/misc/rtc", O_WRONLY )) < 0 )
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88 | bb_perror_msg_and_die ( "Could not access RTC" );
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89 | }
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90 |
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91 | tm = *( utc ? gmtime ( &t ) : localtime ( &t ));
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92 | tm.tm_isdst = 0;
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93 |
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94 | if ( ioctl ( rtc, RTC_SET_TIME, &tm ) < 0 )
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95 | bb_perror_msg_and_die ( "Could not set the RTC time" );
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96 |
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97 | close ( rtc );
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98 | }
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99 |
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100 | static int show_clock(int utc)
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101 | {
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102 | struct tm *ptm;
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103 | time_t t;
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104 | RESERVE_CONFIG_BUFFER(buffer, 64);
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105 |
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106 | t = read_rtc ( utc );
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107 | ptm = localtime ( &t ); /* Sets 'tzname[]' */
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108 |
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109 | safe_strncpy ( buffer, ctime ( &t ), 64);
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110 | if ( buffer [0] )
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111 | buffer [strlen ( buffer ) - 1] = 0;
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112 |
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113 | //printf ( "%s %.6f seconds %s\n", buffer, 0.0, utc ? "" : ( ptm-> tm_isdst ? tzname [1] : tzname [0] ));
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114 | printf ( "%s %.6f seconds\n", buffer, 0.0 );
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115 | RELEASE_CONFIG_BUFFER(buffer);
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116 |
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117 | return 0;
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118 | }
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119 |
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120 | static int to_sys_clock(int utc)
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121 | {
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122 | struct timeval tv = { 0, 0 };
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123 | const struct timezone tz = { timezone/60 - 60*daylight, 0 };
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124 |
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125 | tv.tv_sec = read_rtc ( utc );
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126 |
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127 | if ( settimeofday ( &tv, &tz ))
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128 | bb_perror_msg_and_die ( "settimeofday() failed" );
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129 |
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130 | return 0;
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131 | }
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132 |
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133 | static int from_sys_clock(int utc)
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134 | {
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135 | struct timeval tv = { 0, 0 };
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136 | struct timezone tz = { 0, 0 };
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137 |
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138 | if ( gettimeofday ( &tv, &tz ))
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139 | bb_perror_msg_and_die ( "gettimeofday() failed" );
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140 |
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141 | write_rtc ( tv.tv_sec, utc );
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142 | return 0;
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143 | }
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144 |
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145 | #ifdef CONFIG_FEATURE_HWCLOCK_ADJTIME_FHS
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146 | # define ADJTIME_PATH "/var/lib/hwclock/adjtime"
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147 | #else
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148 | # define ADJTIME_PATH "/etc/adjtime"
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149 | #endif
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150 | static int check_utc(void)
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151 | {
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152 | int utc = 0;
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153 | FILE *f = fopen ( ADJTIME_PATH, "r" );
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154 |
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155 | if ( f ) {
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156 | RESERVE_CONFIG_BUFFER(buffer, 128);
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157 |
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158 | while ( fgets ( buffer, sizeof( buffer ), f )) {
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159 | int len = strlen ( buffer );
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160 |
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161 | while ( len && isspace ( buffer [len - 1] ))
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162 | len--;
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163 |
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164 | buffer [len] = 0;
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165 |
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166 | if ( strncmp ( buffer, "UTC", 3 ) == 0 ) {
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167 | utc = 1;
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168 | break;
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169 | }
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170 | }
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171 | fclose ( f );
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172 | RELEASE_CONFIG_BUFFER(buffer);
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173 | }
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174 | return utc;
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175 | }
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176 |
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177 | #define HWCLOCK_OPT_LOCALTIME 0x01
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178 | #define HWCLOCK_OPT_UTC 0x02
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179 | #define HWCLOCK_OPT_SHOW 0x04
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180 | #define HWCLOCK_OPT_HCTOSYS 0x08
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181 | #define HWCLOCK_OPT_SYSTOHC 0x10
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182 |
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183 | int hwclock_main ( int argc, char **argv )
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184 | {
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185 | unsigned long opt;
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186 | int utc;
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187 |
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188 | #if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS
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189 | static const struct option hwclock_long_options[] = {
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190 | { "localtime", 0, 0, 'l' },
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191 | { "utc", 0, 0, 'u' },
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192 | { "show", 0, 0, 'r' },
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193 | { "hctosys", 0, 0, 's' },
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194 | { "systohc", 0, 0, 'w' },
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195 | { 0, 0, 0, 0 }
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196 | };
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197 | bb_applet_long_options = hwclock_long_options;
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198 | #endif
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199 |
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200 | bb_opt_complementally = "?:r--ws:w--rs:s--wr:l--u:u--l";
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201 | opt = bb_getopt_ulflags(argc, argv, "lursw");
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202 |
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203 | /* If -u or -l wasn't given check if we are using utc */
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204 | if (opt & (HWCLOCK_OPT_UTC | HWCLOCK_OPT_LOCALTIME))
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205 | utc = opt & HWCLOCK_OPT_UTC;
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206 | else
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207 | utc = check_utc();
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208 |
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209 | if (opt & HWCLOCK_OPT_HCTOSYS) {
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210 | return to_sys_clock ( utc );
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211 | }
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212 | else if (opt & HWCLOCK_OPT_SYSTOHC) {
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213 | return from_sys_clock ( utc );
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214 | } else {
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215 | /* default HWCLOCK_OPT_SHOW */
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216 | return show_clock ( utc );
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217 | }
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218 | }
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