blob: b4b54c4241269bf4c96d4972d7b31d7f4ce98010
| 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * adjtimex.c - read, and possibly modify, the Linux kernel `timex' variables. |
| 4 | * |
| 5 | * Originally written: October 1997 |
| 6 | * Last hack: March 2001 |
| 7 | * Copyright 1997, 2000, 2001 Larry Doolittle <LRDoolittle@lbl.gov> |
| 8 | * |
| 9 | * busyboxed 20 March 2001, Larry Doolittle <ldoolitt@recycle.lbl.gov> |
| 10 | * |
| 11 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| 12 | */ |
| 13 | //config:config ADJTIMEX |
| 14 | //config: bool "adjtimex" |
| 15 | //config: default y |
| 16 | //config: select PLATFORM_LINUX |
| 17 | //config: help |
| 18 | //config: Adjtimex reads and optionally sets adjustment parameters for |
| 19 | //config: the Linux clock adjustment algorithm. |
| 20 | |
| 21 | //applet:IF_ADJTIMEX(APPLET(adjtimex, BB_DIR_SBIN, BB_SUID_DROP)) |
| 22 | |
| 23 | //kbuild:lib-$(CONFIG_ADJTIMEX) += adjtimex.o |
| 24 | |
| 25 | //usage:#define adjtimex_trivial_usage |
| 26 | //usage: "[-q] [-o OFF] [-f FREQ] [-p TCONST] [-t TICK]" |
| 27 | //usage:#define adjtimex_full_usage "\n\n" |
| 28 | //usage: "Read or set kernel time variables. See adjtimex(2)\n" |
| 29 | //usage: "\n -q Quiet" |
| 30 | //usage: "\n -o OFF Time offset, microseconds" |
| 31 | //usage: "\n -f FREQ Frequency adjust, integer kernel units (65536 is 1ppm)" |
| 32 | //usage: "\n -t TICK Microseconds per tick, usually 10000" |
| 33 | //usage: "\n (positive -t or -f values make clock run faster)" |
| 34 | //usage: "\n -p TCONST" |
| 35 | |
| 36 | #include "libbb.h" |
| 37 | #ifdef __BIONIC__ |
| 38 | # include <linux/timex.h> |
| 39 | extern int adjtimex (struct timex *); |
| 40 | #else |
| 41 | # include <sys/timex.h> |
| 42 | #endif |
| 43 | |
| 44 | static const uint16_t statlist_bit[] ALIGN2 = { |
| 45 | STA_PLL, |
| 46 | STA_PPSFREQ, |
| 47 | STA_PPSTIME, |
| 48 | STA_FLL, |
| 49 | STA_INS, |
| 50 | STA_DEL, |
| 51 | STA_UNSYNC, |
| 52 | STA_FREQHOLD, |
| 53 | STA_PPSSIGNAL, |
| 54 | STA_PPSJITTER, |
| 55 | STA_PPSWANDER, |
| 56 | STA_PPSERROR, |
| 57 | STA_CLOCKERR, |
| 58 | 0 |
| 59 | }; |
| 60 | static const char statlist_name[] ALIGN1 = |
| 61 | "PLL" "\0" |
| 62 | "PPSFREQ" "\0" |
| 63 | "PPSTIME" "\0" |
| 64 | "FFL" "\0" |
| 65 | "INS" "\0" |
| 66 | "DEL" "\0" |
| 67 | "UNSYNC" "\0" |
| 68 | "FREQHOLD" "\0" |
| 69 | "PPSSIGNAL" "\0" |
| 70 | "PPSJITTER" "\0" |
| 71 | "PPSWANDER" "\0" |
| 72 | "PPSERROR" "\0" |
| 73 | "CLOCKERR" |
| 74 | ; |
| 75 | |
| 76 | static const char ret_code_descript[] ALIGN1 = |
| 77 | "clock synchronized" "\0" |
| 78 | "insert leap second" "\0" |
| 79 | "delete leap second" "\0" |
| 80 | "leap second in progress" "\0" |
| 81 | "leap second has occurred" "\0" |
| 82 | "clock not synchronized" |
| 83 | ; |
| 84 | |
| 85 | int adjtimex_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 86 | int adjtimex_main(int argc UNUSED_PARAM, char **argv) |
| 87 | { |
| 88 | enum { |
| 89 | OPT_quiet = 0x1 |
| 90 | }; |
| 91 | unsigned opt; |
| 92 | char *opt_o, *opt_f, *opt_p, *opt_t; |
| 93 | struct timex txc; |
| 94 | int i, ret; |
| 95 | const char *descript; |
| 96 | |
| 97 | opt_complementary = "=0"; /* no valid non-option parameters */ |
| 98 | opt = getopt32(argv, "qo:f:p:t:", |
| 99 | &opt_o, &opt_f, &opt_p, &opt_t); |
| 100 | txc.modes = 0; |
| 101 | //if (opt & 0x1) // -q |
| 102 | if (opt & 0x2) { // -o |
| 103 | txc.offset = xatol(opt_o); |
| 104 | txc.modes |= ADJ_OFFSET_SINGLESHOT; |
| 105 | } |
| 106 | if (opt & 0x4) { // -f |
| 107 | txc.freq = xatol(opt_f); |
| 108 | txc.modes |= ADJ_FREQUENCY; |
| 109 | } |
| 110 | if (opt & 0x8) { // -p |
| 111 | txc.constant = xatol(opt_p); |
| 112 | txc.modes |= ADJ_TIMECONST; |
| 113 | } |
| 114 | if (opt & 0x10) { // -t |
| 115 | txc.tick = xatol(opt_t); |
| 116 | txc.modes |= ADJ_TICK; |
| 117 | } |
| 118 | |
| 119 | ret = adjtimex(&txc); |
| 120 | |
| 121 | if (ret < 0) { |
| 122 | bb_perror_nomsg_and_die(); |
| 123 | } |
| 124 | |
| 125 | if (!(opt & OPT_quiet)) { |
| 126 | const char *sep; |
| 127 | const char *name; |
| 128 | |
| 129 | printf( |
| 130 | " mode: %d\n" |
| 131 | "-o offset: %ld us\n" |
| 132 | "-f freq.adjust: %ld (65536 = 1ppm)\n" |
| 133 | " maxerror: %ld\n" |
| 134 | " esterror: %ld\n" |
| 135 | " status: %d (", |
| 136 | txc.modes, txc.offset, txc.freq, txc.maxerror, |
| 137 | txc.esterror, txc.status); |
| 138 | |
| 139 | /* representative output of next code fragment: |
| 140 | * "PLL | PPSTIME" |
| 141 | */ |
| 142 | name = statlist_name; |
| 143 | sep = ""; |
| 144 | for (i = 0; statlist_bit[i]; i++) { |
| 145 | if (txc.status & statlist_bit[i]) { |
| 146 | printf("%s%s", sep, name); |
| 147 | sep = " | "; |
| 148 | } |
| 149 | name += strlen(name) + 1; |
| 150 | } |
| 151 | |
| 152 | descript = "error"; |
| 153 | if (ret <= 5) |
| 154 | descript = nth_string(ret_code_descript, ret); |
| 155 | printf(")\n" |
| 156 | "-p timeconstant: %ld\n" |
| 157 | " precision: %ld us\n" |
| 158 | " tolerance: %ld\n" |
| 159 | "-t tick: %ld us\n" |
| 160 | " time.tv_sec: %ld\n" |
| 161 | " time.tv_usec: %ld\n" |
| 162 | " return value: %d (%s)\n", |
| 163 | txc.constant, |
| 164 | txc.precision, txc.tolerance, txc.tick, |
| 165 | (long)txc.time.tv_sec, (long)txc.time.tv_usec, ret, descript); |
| 166 | } |
| 167 | |
| 168 | return 0; |
| 169 | } |
| 170 |