[821] | 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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[1765] | 12 | #include "libbb.h"
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[821] | 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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[1765] | 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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[821] | 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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[1765] | 59 | int rtc = xopen_rtc(O_RDONLY);
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[821] | 60 |
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[1765] | 61 | memset(&tm, 0, sizeof(struct tm));
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| 62 | xioctl(rtc, RTC_RD_TIME, &tm);
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[821] | 63 | tm.tm_isdst = -1; /* not known */
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| 64 |
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[1765] | 65 | close(rtc);
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[821] | 66 |
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[1765] | 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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[821] | 71 | }
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| 72 |
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[1765] | 73 | t = mktime(&tm);
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[821] | 74 |
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[1765] | 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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[821] | 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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[1765] | 87 | int rtc = xopen_rtc(O_WRONLY);
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[821] | 88 |
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[1765] | 89 | tm = *(utc ? gmtime(&t) : localtime(&t));
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[821] | 90 | tm.tm_isdst = 0;
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| 91 |
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[1765] | 92 | xioctl(rtc, RTC_SET_TIME, &tm);
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[821] | 93 |
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[1765] | 94 | close(rtc);
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[821] | 95 | }
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| 96 |
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[1765] | 97 | static void show_clock(int utc)
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[821] | 98 | {
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[1765] | 99 | //struct tm *ptm;
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[821] | 100 | time_t t;
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[1765] | 101 | char *cp;
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[821] | 102 |
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[1765] | 103 | t = read_rtc(utc);
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| 104 | //ptm = localtime(&t); /* Sets 'tzname[]' */
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[821] | 105 |
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[1765] | 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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[821] | 109 |
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[1765] | 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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[821] | 112 | }
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| 113 |
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[1765] | 114 | static void to_sys_clock(int utc)
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[821] | 115 | {
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[1765] | 116 | struct timeval tv;
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[821] | 117 | const struct timezone tz = { timezone/60 - 60*daylight, 0 };
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| 118 |
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[1765] | 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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[821] | 123 | }
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| 124 |
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[1765] | 125 | static void from_sys_clock(int utc)
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[821] | 126 | {
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[1765] | 127 | struct timeval tv;
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[821] | 128 |
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[1765] | 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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[821] | 133 | }
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| 134 |
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[1765] | 135 | #if ENABLE_FEATURE_HWCLOCK_ADJTIME_FHS
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[821] | 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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[1765] | 143 | FILE *f = fopen(ADJTIME_PATH, "r");
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[821] | 144 |
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[1765] | 145 | if (f) {
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[821] | 146 | RESERVE_CONFIG_BUFFER(buffer, 128);
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| 147 |
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[1765] | 148 | while (fgets(buffer, sizeof(buffer), f)) {
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| 149 | int len = strlen(buffer);
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[821] | 150 |
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[1765] | 151 | while (len && isspace(buffer[len - 1]))
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[821] | 152 | len--;
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| 153 |
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[1765] | 154 | buffer[len] = 0;
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[821] | 155 |
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[1765] | 156 | if (strncmp(buffer, "UTC", 3) == 0) {
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[821] | 157 | utc = 1;
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| 158 | break;
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| 159 | }
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| 160 | }
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[1765] | 161 | fclose(f);
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[821] | 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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[1765] | 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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[821] | 173 |
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[1765] | 174 | int hwclock_main(int argc, char **argv);
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| 175 | int hwclock_main(int argc, char **argv)
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[821] | 176 | {
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[1765] | 177 | unsigned opt;
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[821] | 178 | int utc;
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| 179 |
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| 180 | #if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS
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[1765] | 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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[821] | 190 | #endif
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[1765] | 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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[821] | 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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[1765] | 201 | to_sys_clock(utc);
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| 202 | return 0;
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[821] | 203 | }
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[1765] | 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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[821] | 207 | }
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[1765] | 208 | /* default HWCLOCK_OPT_SHOW */
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| 209 | show_clock(utc);
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| 210 | return 0;
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[821] | 211 | }
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