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 | #include <sys/utsname.h>
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11 | #include <getopt.h>
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12 | #include "libbb.h"
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13 |
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14 | /* Copied from linux/rtc.h to eliminate the kernel dependency */
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15 | struct linux_rtc_time {
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16 | int tm_sec;
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17 | int tm_min;
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18 | int tm_hour;
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19 | int tm_mday;
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20 | int tm_mon;
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21 | int tm_year;
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22 | int tm_wday;
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23 | int tm_yday;
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24 | int tm_isdst;
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25 | };
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26 |
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27 | #define RTC_SET_TIME _IOW('p', 0x0a, struct linux_rtc_time) /* Set RTC time */
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28 | #define RTC_RD_TIME _IOR('p', 0x09, struct linux_rtc_time) /* Read RTC time */
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29 |
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30 | #if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS
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31 | # ifndef _GNU_SOURCE
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32 | # define _GNU_SOURCE
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33 | # endif
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34 | #endif
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35 |
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36 | static const char *rtcname;
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37 |
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38 | static int xopen_rtc(int flags)
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39 | {
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40 | int rtc;
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41 |
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42 | if (!rtcname) {
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43 | rtc = open("/dev/rtc", flags);
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44 | if (rtc >= 0)
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45 | return rtc;
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46 | rtc = open("/dev/rtc0", flags);
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47 | if (rtc >= 0)
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48 | return rtc;
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49 | rtcname = "/dev/misc/rtc";
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50 | }
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51 | return xopen(rtcname, flags);
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52 | }
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53 |
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54 | static time_t read_rtc(int utc)
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55 | {
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56 | struct tm tm;
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57 | char *oldtz = 0;
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58 | time_t t = 0;
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59 | int rtc = xopen_rtc(O_RDONLY);
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60 |
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61 | memset(&tm, 0, sizeof(struct tm));
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62 | xioctl(rtc, RTC_RD_TIME, &tm);
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63 | tm.tm_isdst = -1; /* not known */
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64 |
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65 | close(rtc);
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66 |
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67 | if (utc) {
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68 | oldtz = getenv("TZ");
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69 | putenv((char*)"TZ=UTC0");
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70 | tzset();
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71 | }
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72 |
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73 | t = mktime(&tm);
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74 |
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75 | if (utc) {
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76 | unsetenv("TZ");
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77 | if (oldtz)
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78 | putenv(oldtz - 3);
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79 | tzset();
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80 | }
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81 | return t;
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82 | }
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83 |
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84 | static void write_rtc(time_t t, int utc)
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85 | {
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86 | struct tm tm;
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87 | int rtc = xopen_rtc(O_WRONLY);
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88 |
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89 | tm = *(utc ? gmtime(&t) : localtime(&t));
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90 | tm.tm_isdst = 0;
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91 |
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92 | xioctl(rtc, RTC_SET_TIME, &tm);
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93 |
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94 | close(rtc);
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95 | }
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96 |
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97 | static void show_clock(int utc)
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98 | {
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99 | //struct tm *ptm;
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100 | time_t t;
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101 | char *cp;
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102 |
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103 | t = read_rtc(utc);
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104 | //ptm = localtime(&t); /* Sets 'tzname[]' */
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105 |
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106 | cp = ctime(&t);
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107 | if (cp[0])
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108 | cp[strlen(cp) - 1] = '\0';
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109 |
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110 | //printf("%s %.6f seconds %s\n", cp, 0.0, utc ? "" : (ptm->tm_isdst ? tzname[1] : tzname[0]));
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111 | printf("%s 0.000000 seconds\n", cp);
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112 | }
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113 |
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114 | static void to_sys_clock(int utc)
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115 | {
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116 | struct timeval tv;
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117 | const struct timezone tz = { timezone/60 - 60*daylight, 0 };
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118 |
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119 | tv.tv_sec = read_rtc(utc);
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120 | tv.tv_usec = 0;
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121 | if (settimeofday(&tv, &tz))
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122 | bb_perror_msg_and_die("settimeofday() failed");
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123 | }
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124 |
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125 | static void from_sys_clock(int utc)
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126 | {
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127 | struct timeval tv;
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128 |
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129 | gettimeofday(&tv, NULL);
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130 | //if (gettimeofday(&tv, NULL))
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131 | // bb_perror_msg_and_die("gettimeofday() failed");
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132 | write_rtc(tv.tv_sec, utc);
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133 | }
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134 |
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135 | #if ENABLE_FEATURE_HWCLOCK_ADJTIME_FHS
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136 | # define ADJTIME_PATH "/var/lib/hwclock/adjtime"
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137 | #else
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138 | # define ADJTIME_PATH "/etc/adjtime"
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139 | #endif
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140 | static int check_utc(void)
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141 | {
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142 | int utc = 0;
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143 | FILE *f = fopen(ADJTIME_PATH, "r");
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144 |
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145 | if (f) {
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146 | RESERVE_CONFIG_BUFFER(buffer, 128);
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147 |
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148 | while (fgets(buffer, sizeof(buffer), f)) {
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149 | int len = strlen(buffer);
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150 |
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151 | while (len && isspace(buffer[len - 1]))
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152 | len--;
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153 |
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154 | buffer[len] = 0;
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155 |
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156 | if (strncmp(buffer, "UTC", 3) == 0) {
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157 | utc = 1;
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158 | break;
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159 | }
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160 | }
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161 | fclose(f);
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162 | RELEASE_CONFIG_BUFFER(buffer);
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163 | }
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164 | return utc;
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165 | }
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166 |
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167 | #define HWCLOCK_OPT_LOCALTIME 0x01
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168 | #define HWCLOCK_OPT_UTC 0x02
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169 | #define HWCLOCK_OPT_SHOW 0x04
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170 | #define HWCLOCK_OPT_HCTOSYS 0x08
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171 | #define HWCLOCK_OPT_SYSTOHC 0x10
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172 | #define HWCLOCK_OPT_RTCFILE 0x20
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173 |
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174 | int hwclock_main(int argc, char **argv);
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175 | int hwclock_main(int argc, char **argv)
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176 | {
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177 | unsigned opt;
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178 | int utc;
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179 |
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180 | #if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS
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181 | static const char hwclock_longopts[] ALIGN1 =
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182 | "localtime\0" No_argument "l"
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183 | "utc\0" No_argument "u"
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184 | "show\0" No_argument "r"
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185 | "hctosys\0" No_argument "s"
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186 | "systohc\0" No_argument "w"
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187 | "file\0" Required_argument "f"
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188 | ;
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189 | applet_long_options = hwclock_longopts;
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190 | #endif
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191 | opt_complementary = "r--ws:w--rs:s--wr:l--u:u--l";
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192 | opt = getopt32(argv, "lurswf:", &rtcname);
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193 |
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194 | /* If -u or -l wasn't given check if we are using utc */
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195 | if (opt & (HWCLOCK_OPT_UTC | HWCLOCK_OPT_LOCALTIME))
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196 | utc = opt & HWCLOCK_OPT_UTC;
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197 | else
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198 | utc = check_utc();
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199 |
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200 | if (opt & HWCLOCK_OPT_HCTOSYS) {
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201 | to_sys_clock(utc);
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202 | return 0;
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203 | }
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204 | if (opt & HWCLOCK_OPT_SYSTOHC) {
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205 | from_sys_clock(utc);
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206 | return 0;
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207 | }
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208 | /* default HWCLOCK_OPT_SHOW */
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209 | show_clock(utc);
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210 | return 0;
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211 | }
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