source: MondoRescue/branches/3.2/mindi-busybox/miscutils/adjtimex.c@ 3277

/* vi: set sw=4 ts=4: */
/*
 * adjtimex.c - read, and possibly modify, the Linux kernel `timex' variables.
 *
 * Originally written: October 1997
 * Last hack: March 2001
 * Copyright 1997, 2000, 2001 Larry Doolittle <LRDoolittle@lbl.gov>
 *
 * busyboxed 20 March 2001, Larry Doolittle <ldoolitt@recycle.lbl.gov>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */

//usage:#define adjtimex_trivial_usage
//usage:       "[-q] [-o OFF] [-f FREQ] [-p TCONST] [-t TICK]"
//usage:#define adjtimex_full_usage "\n\n"
//usage:       "Read and optionally set system timebase parameters. See adjtimex(2)\n"
//usage:     "\n    -q  Quiet"
//usage:     "\n    -o OFF  Time offset, microseconds"
//usage:     "\n    -f FREQ Frequency adjust, integer kernel units (65536 is 1ppm)"
//usage:     "\n        (positive values make clock run faster)"
//usage:     "\n    -t TICK Microseconds per tick, usually 10000"
//usage:     "\n    -p TCONST"

#include "libbb.h"
#ifdef __BIONIC__
# include <linux/timex.h>
#else
# include <sys/timex.h>
#endif

static const uint16_t statlist_bit[] = {
    STA_PLL,
    STA_PPSFREQ,
    STA_PPSTIME,
    STA_FLL,
    STA_INS,
    STA_DEL,
    STA_UNSYNC,
    STA_FREQHOLD,
    STA_PPSSIGNAL,
    STA_PPSJITTER,
    STA_PPSWANDER,
    STA_PPSERROR,
    STA_CLOCKERR,
    0
};
static const char statlist_name[] =
    "PLL"       "\0"
    "PPSFREQ"   "\0"
    "PPSTIME"   "\0"
    "FFL"       "\0"
    "INS"       "\0"
    "DEL"       "\0"
    "UNSYNC"    "\0"
    "FREQHOLD"  "\0"
    "PPSSIGNAL" "\0"
    "PPSJITTER" "\0"
    "PPSWANDER" "\0"
    "PPSERROR"  "\0"
    "CLOCKERR"
;

static const char ret_code_descript[] =
    "clock synchronized" "\0"
    "insert leap second" "\0"
    "delete leap second" "\0"
    "leap second in progress" "\0"
    "leap second has occurred" "\0"
    "clock not synchronized"
;

int adjtimex_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int adjtimex_main(int argc UNUSED_PARAM, char **argv)
{
    enum {
        OPT_quiet = 0x1
    };
    unsigned opt;
    char *opt_o, *opt_f, *opt_p, *opt_t;
    struct timex txc;
    int i, ret;
    const char *descript;

    opt_complementary = "=0"; /* no valid non-option parameters */
    opt = getopt32(argv, "qo:f:p:t:",
            &opt_o, &opt_f, &opt_p, &opt_t);
    txc.modes = 0;
    //if (opt & 0x1) // -q
    if (opt & 0x2) { // -o
        txc.offset = xatol(opt_o);
        txc.modes |= ADJ_OFFSET_SINGLESHOT;
    }
    if (opt & 0x4) { // -f
        txc.freq = xatol(opt_f);
        txc.modes |= ADJ_FREQUENCY;
    }
    if (opt & 0x8) { // -p
        txc.constant = xatol(opt_p);
        txc.modes |= ADJ_TIMECONST;
    }
    if (opt & 0x10) { // -t
        txc.tick = xatol(opt_t);
        txc.modes |= ADJ_TICK;
    }

    ret = adjtimex(&txc);

    if (ret < 0) {
        bb_perror_nomsg_and_die();
    }

    if (!(opt & OPT_quiet)) {
        int sep;
        const char *name;

        printf(
            "    mode:         %d\n"
            "-o  offset:       %ld\n"
            "-f  frequency:    %ld\n"
            "    maxerror:     %ld\n"
            "    esterror:     %ld\n"
            "    status:       %d (",
        txc.modes, txc.offset, txc.freq, txc.maxerror,
        txc.esterror, txc.status);

        /* representative output of next code fragment:
           "PLL | PPSTIME" */
        name = statlist_name;
        sep = 0;
        for (i = 0; statlist_bit[i]; i++) {
            if (txc.status & statlist_bit[i]) {
                if (sep)
                    fputs(" | ", stdout);
                fputs(name, stdout);
                sep = 1;
            }
            name += strlen(name) + 1;
        }

        descript = "error";
        if (ret <= 5)
            descript = nth_string(ret_code_descript, ret);
        printf(")\n"
            "-p  timeconstant: %ld\n"
            "    precision:    %ld\n"
            "    tolerance:    %ld\n"
            "-t  tick:         %ld\n"
            "    time.tv_sec:  %ld\n"
            "    time.tv_usec: %ld\n"
            "    return value: %d (%s)\n",
        txc.constant,
        txc.precision, txc.tolerance, txc.tick,
        (long)txc.time.tv_sec, (long)txc.time.tv_usec, ret, descript);
    }

    return 0;
}