release/src/router/busybox/miscutils/adjtimex.c

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