1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * adjtimex.c - read, and possibly modify, the Linux kernel `timex' variables.
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4 | *
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5 | * Originally written: October 1997
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6 | * Last hack: March 2001
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7 | * Copyright 1997, 2000, 2001 Larry Doolittle <LRDoolittle@lbl.gov>
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8 | *
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9 | * busyboxed 20 March 2001, Larry Doolittle <ldoolitt@recycle.lbl.gov>
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10 | *
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11 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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12 | */
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13 |
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14 | //usage:#define adjtimex_trivial_usage
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15 | //usage: "[-q] [-o OFF] [-f FREQ] [-p TCONST] [-t TICK]"
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16 | //usage:#define adjtimex_full_usage "\n\n"
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17 | //usage: "Read and optionally set system timebase parameters. See adjtimex(2)\n"
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18 | //usage: "\n -q Quiet"
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19 | //usage: "\n -o OFF Time offset, microseconds"
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20 | //usage: "\n -f FREQ Frequency adjust, integer kernel units (65536 is 1ppm)"
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21 | //usage: "\n (positive values make clock run faster)"
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22 | //usage: "\n -t TICK Microseconds per tick, usually 10000"
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23 | //usage: "\n -p TCONST"
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24 |
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25 | #include "libbb.h"
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26 | #ifdef __BIONIC__
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27 | # include <linux/timex.h>
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28 | #else
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29 | # include <sys/timex.h>
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30 | #endif
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31 |
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32 | static const uint16_t statlist_bit[] = {
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33 | STA_PLL,
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34 | STA_PPSFREQ,
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35 | STA_PPSTIME,
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36 | STA_FLL,
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37 | STA_INS,
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38 | STA_DEL,
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39 | STA_UNSYNC,
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40 | STA_FREQHOLD,
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41 | STA_PPSSIGNAL,
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42 | STA_PPSJITTER,
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43 | STA_PPSWANDER,
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44 | STA_PPSERROR,
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45 | STA_CLOCKERR,
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46 | 0
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47 | };
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48 | static const char statlist_name[] =
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49 | "PLL" "\0"
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50 | "PPSFREQ" "\0"
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51 | "PPSTIME" "\0"
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52 | "FFL" "\0"
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53 | "INS" "\0"
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54 | "DEL" "\0"
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55 | "UNSYNC" "\0"
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56 | "FREQHOLD" "\0"
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57 | "PPSSIGNAL" "\0"
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58 | "PPSJITTER" "\0"
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59 | "PPSWANDER" "\0"
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60 | "PPSERROR" "\0"
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61 | "CLOCKERR"
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62 | ;
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63 |
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64 | static const char ret_code_descript[] =
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65 | "clock synchronized" "\0"
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66 | "insert leap second" "\0"
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67 | "delete leap second" "\0"
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68 | "leap second in progress" "\0"
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69 | "leap second has occurred" "\0"
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70 | "clock not synchronized"
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71 | ;
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72 |
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73 | int adjtimex_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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74 | int adjtimex_main(int argc UNUSED_PARAM, char **argv)
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75 | {
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76 | enum {
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77 | OPT_quiet = 0x1
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78 | };
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79 | unsigned opt;
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80 | char *opt_o, *opt_f, *opt_p, *opt_t;
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81 | struct timex txc;
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82 | int i, ret;
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83 | const char *descript;
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84 |
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85 | opt_complementary = "=0"; /* no valid non-option parameters */
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86 | opt = getopt32(argv, "qo:f:p:t:",
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87 | &opt_o, &opt_f, &opt_p, &opt_t);
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88 | txc.modes = 0;
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89 | //if (opt & 0x1) // -q
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90 | if (opt & 0x2) { // -o
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91 | txc.offset = xatol(opt_o);
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92 | txc.modes |= ADJ_OFFSET_SINGLESHOT;
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93 | }
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94 | if (opt & 0x4) { // -f
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95 | txc.freq = xatol(opt_f);
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96 | txc.modes |= ADJ_FREQUENCY;
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97 | }
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98 | if (opt & 0x8) { // -p
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99 | txc.constant = xatol(opt_p);
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100 | txc.modes |= ADJ_TIMECONST;
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101 | }
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102 | if (opt & 0x10) { // -t
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103 | txc.tick = xatol(opt_t);
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104 | txc.modes |= ADJ_TICK;
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105 | }
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106 |
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107 | ret = adjtimex(&txc);
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108 |
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109 | if (ret < 0) {
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110 | bb_perror_nomsg_and_die();
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111 | }
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112 |
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113 | if (!(opt & OPT_quiet)) {
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114 | int sep;
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115 | const char *name;
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116 |
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117 | printf(
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118 | " mode: %d\n"
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119 | "-o offset: %ld\n"
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120 | "-f frequency: %ld\n"
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121 | " maxerror: %ld\n"
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122 | " esterror: %ld\n"
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123 | " status: %d (",
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124 | txc.modes, txc.offset, txc.freq, txc.maxerror,
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125 | txc.esterror, txc.status);
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126 |
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127 | /* representative output of next code fragment:
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128 | "PLL | PPSTIME" */
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129 | name = statlist_name;
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130 | sep = 0;
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131 | for (i = 0; statlist_bit[i]; i++) {
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132 | if (txc.status & statlist_bit[i]) {
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133 | if (sep)
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134 | fputs(" | ", stdout);
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135 | fputs(name, stdout);
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136 | sep = 1;
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137 | }
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138 | name += strlen(name) + 1;
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139 | }
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140 |
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141 | descript = "error";
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142 | if (ret <= 5)
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143 | descript = nth_string(ret_code_descript, ret);
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144 | printf(")\n"
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145 | "-p timeconstant: %ld\n"
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146 | " precision: %ld\n"
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147 | " tolerance: %ld\n"
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148 | "-t tick: %ld\n"
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149 | " time.tv_sec: %ld\n"
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150 | " time.tv_usec: %ld\n"
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151 | " return value: %d (%s)\n",
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152 | txc.constant,
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153 | txc.precision, txc.tolerance, txc.tick,
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154 | (long)txc.time.tv_sec, (long)txc.time.tv_usec, ret, descript);
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155 | }
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156 |
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157 | return 0;
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158 | }
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