Mercurial > hg > toybox

annotate toys/pending/hwclock.c @ 1668:7e3372a47248 draft

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fix hwclock's rtc selection For systems using /dev/rtcN, /dev/rtc0 isn't necessarily the RTC that's used to provide the system time at boot time. We need to search for the RTC whose /sys/class/rtc/rtcN/hctosys contains "1".
author Elliott Hughes <enh@google.com>
date Tue, 20 Jan 2015 16:03:29 -0600
parents f42dceed5071
children ae981311e232
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1 /* hwclock.c - get and set the hwclock
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2 *
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3 * Copyright 2014 Bilal Qureshi <bilal.jmi@gmail.com>
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4 *
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5 * No Standard.
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6 *
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7 USE_HWCLOCK(NEWTOY(hwclock, ">0(fast)f(rtc):u(utc)l(localtime)t(systz)w(systohc)s(hctosys)r(show)[!ul][!rsw]", TOYFLAG_USR|TOYFLAG_BIN))
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8
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9 config HWCLOCK
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10 bool "hwclock"
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11 default n
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12 help
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13 usage: hwclock [-rswtluf]
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14
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15 -f FILE Use specified device file instead of /dev/rtc (--show)
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16 -l Hardware clock uses localtime (--localtime)
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17 -r Show hardware clock time (--show)
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18 -s Set system time from hardware clock (--hctosys)
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19 -t Set the system time based on the current timezone (--systz)
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20 -u Hardware clock uses UTC (--utc)
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21 -w Set hardware clock from system time (--systohc)
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22 */
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23 #define FOR_hwclock
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24 #include "toys.h"
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25 #include <linux/rtc.h>
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26
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27 GLOBALS(
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28 char *fname;
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29
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30 int utc;
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31 )
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32
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33 static int check_hctosys(struct dirtree* node)
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34 {
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35 FILE *fp;
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36
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37 if (!node->parent) return DIRTREE_RECURSE;
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38
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39 snprintf(toybuf, sizeof(toybuf), "/sys/class/rtc/%s/hctosys", node->name);
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40 fp = fopen(toybuf, "r");
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41 if (fp) {
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42 int hctosys = 0;
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43 int items = fscanf(fp, "%d", &hctosys);
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44 fclose(fp);
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45 if (items == 1 && hctosys == 1) {
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46 snprintf(toybuf, sizeof(toybuf), "/dev/%s", node->name);
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47 TT.fname = toybuf;
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48 return DIRTREE_ABORT;
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49 }
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50 }
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51 return 0;
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52 }
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53
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54 // Search /sys/class/rtc for the RTC that the system clock is set from.
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55 // See the kernel's Documentation/rtc.txt.
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56 static int open_wall_clock_rtc(int flag)
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57 {
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58 TT.fname = NULL;
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59 dirtree_read("/sys/class/rtc", check_hctosys);
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60 return TT.fname ? xopen(TT.fname, flag) : -1;
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61 }
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62
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63 static int rtc_open(int flag)
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64 {
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65 if (!TT.fname) {
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66 int fd;
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67
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68 if ((fd = open((TT.fname = "/dev/rtc"), flag)) != -1) return fd;
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69 else if ((fd = open_wall_clock_rtc(flag)) != -1) return fd;
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70 else TT.fname = "/dev/misc/rtc";
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71 }
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72 return xopen(TT.fname, flag);
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73 }
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74
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75 static time_t get_rtc()
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76 {
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77 struct tm time;
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78 time_t tm;
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79 char *ptz_old = 0;
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80 int fd = rtc_open(O_RDONLY);
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81
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82 xioctl(fd, RTC_RD_TIME, &time);
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83 close(fd);
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84 if (TT.utc) {
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85 ptz_old = getenv("TZ");
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86 if (putenv((char*)"TZ=UTC0")) perror_exit("putenv");
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87 tzset();
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88 }
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89 if ((tm = mktime(&time)) < 0) error_exit("mktime failed");
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90 if (TT.utc) {
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91 if (unsetenv("TZ") < 0) perror_exit("unsetenv");
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92 if (ptz_old && putenv(ptz_old - 3)) perror_exit("putenv");
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93 tzset();
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94 }
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95 return tm;
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96 }
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97
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98 static void set_sysclock_from_hwclock()
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99 {
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100 struct timezone tmzone;
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101 struct timeval tmval;
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102
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103 tmzone.tz_minuteswest = timezone / 60 - 60 * daylight;
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104 tmzone.tz_dsttime = 0;
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105 tmval.tv_sec = get_rtc();
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106 tmval.tv_usec = 0;
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107 if (settimeofday(&tmval, &tmzone) < 0) perror_exit("settimeofday");
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108 }
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109
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110 static void set_hwclock_from_sysclock()
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111 {
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112 struct timeval tmval;
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113 struct tm time;
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114 int fd = rtc_open(O_WRONLY);
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115
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116 if (gettimeofday(&tmval, NULL) < 0) perror_exit("gettimeofday");
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117 // converting a time value to broken-down UTC time
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118 if (TT.utc && !gmtime_r((time_t*)&tmval.tv_sec, &time))
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119 error_exit("gmtime_r failed");
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120 // converting a time value to a broken-down localtime
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121 else if (!(localtime_r((time_t*)&tmval.tv_sec, &time)))
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122 error_exit("localtime_r failed");
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123
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124 /* The value of tm_isdst will positive if daylight saving time is in effect,
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125 * zero if it is not and negative if the information is not available.
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126 * */
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127 time.tm_isdst = 0;
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128 xioctl(fd, RTC_SET_TIME, &time);
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129 close(fd);
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130 }
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131
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132 static void set_sysclock_timezone()
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133 {
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134 struct timezone tmzone;
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135 struct timeval tmval;
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136 struct tm *pb;
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137
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138 if (gettimeofday(&tmval, NULL) < 0) perror_exit("gettimeofday");
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139 if (!(pb = localtime(&tmval.tv_sec))) error_exit("localtime failed");
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140 // extern long timezone => defined in header sys/time.h
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141 tmzone.tz_minuteswest = timezone / 60;
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142 if (pb->tm_isdst) tmzone.tz_minuteswest -= 60;
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143 tmzone.tz_dsttime = 0; // daylight saving time is not in effect
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144 if (gettimeofday(&tmval, NULL) < 0) perror_exit("gettimeofday");
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145 if (!TT.utc) tmval.tv_sec += tmzone.tz_minuteswest * 60;
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146 if (settimeofday(&tmval, &tmzone) < 0) perror_exit("settimeofday");
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147 }
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148
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149 void hwclock_main()
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150 {
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151 // check for UTC
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152 if (!(toys.optflags & FLAG_u)) {
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153 FILE *fp = fopen("/etc/adjtime", "r");
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154
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155 if (fp) {
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156 char *line = NULL;
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157 size_t st;
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158
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159 while (0 < getline(&line, &st, fp)) {
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160 if (!strncmp(line, "UTC", 3)) {
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161 TT.utc = 1;
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162 break;
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163 }
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164 free(line);
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165 }
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166 fclose(fp);
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167 }
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168 } else TT.utc = 1;
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169
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170 if (toys.optflags & FLAG_w) set_hwclock_from_sysclock();
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171 else if (toys.optflags & FLAG_s) set_sysclock_from_hwclock();
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172 else if (toys.optflags & FLAG_t) set_sysclock_timezone();
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173 else if ((toys.optflags & FLAG_r) || (toys.optflags & FLAG_l)
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174 || !*toys.optargs)
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175 {
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176 time_t tm = get_rtc();
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177 char *s, *pctm = ctime(&tm);
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178
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179 // ctime() is defined as equivalent to asctime(localtime(t)),
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180 // which is defined to overflow its buffer rather than return NULL.
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181 // if (!pctm) error_exit("can't happen");
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182 if ((s = strrchr(pctm, '\n'))) *s = '\0';
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183 // TODO: implement this.
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184 xprintf("%s 0.000000 seconds\n", pctm);
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185 }
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186 }