169 lines
4.0 KiB
C
169 lines
4.0 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* adjtimex.c - read, and possibly modify, the Linux kernel `timex' variables.
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*
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* Originally written: October 1997
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* Last hack: March 2001
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* Copyright 1997, 2000, 2001 Larry Doolittle <LRDoolittle@lbl.gov>
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*
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* busyboxed 20 March 2001, Larry Doolittle <ldoolitt@recycle.lbl.gov>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config ADJTIMEX
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//config: bool "adjtimex (4.5 kb)"
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//config: default y
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//config: select PLATFORM_LINUX
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//config: help
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//config: Adjtimex reads and optionally sets adjustment parameters for
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//config: the Linux clock adjustment algorithm.
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//applet:IF_ADJTIMEX(APPLET(adjtimex, BB_DIR_SBIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_ADJTIMEX) += adjtimex.o
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//usage:#define adjtimex_trivial_usage
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//usage: "[-q] [-o OFF] [-f FREQ] [-p TCONST] [-t TICK]"
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//usage:#define adjtimex_full_usage "\n\n"
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//usage: "Read or set kernel time variables. See adjtimex(2)\n"
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//usage: "\n -q Quiet"
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//usage: "\n -o OFF Time offset, microseconds"
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//usage: "\n -f FREQ Frequency adjust, integer kernel units (65536 is 1ppm)"
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//usage: "\n -t TICK Microseconds per tick, usually 10000"
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//usage: "\n (positive -t or -f values make clock run faster)"
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//usage: "\n -p TCONST"
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#include "libbb.h"
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#ifdef __BIONIC__
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# include <linux/timex.h>
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#else
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# include <sys/timex.h>
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#endif
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static const uint16_t statlist_bit[] ALIGN2 = {
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STA_PLL,
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STA_PPSFREQ,
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STA_PPSTIME,
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STA_FLL,
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STA_INS,
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STA_DEL,
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STA_UNSYNC,
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STA_FREQHOLD,
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STA_PPSSIGNAL,
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STA_PPSJITTER,
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STA_PPSWANDER,
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STA_PPSERROR,
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STA_CLOCKERR,
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0
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};
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static const char statlist_name[] ALIGN1 =
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"PLL" "\0"
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"PPSFREQ" "\0"
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"PPSTIME" "\0"
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"FFL" "\0"
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"INS" "\0"
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"DEL" "\0"
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"UNSYNC" "\0"
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"FREQHOLD" "\0"
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"PPSSIGNAL" "\0"
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"PPSJITTER" "\0"
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"PPSWANDER" "\0"
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"PPSERROR" "\0"
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"CLOCKERR"
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;
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static const char ret_code_descript[] ALIGN1 =
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"clock synchronized" "\0"
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"insert leap second" "\0"
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"delete leap second" "\0"
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"leap second in progress" "\0"
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"leap second has occurred" "\0"
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"clock not synchronized"
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;
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int adjtimex_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int adjtimex_main(int argc UNUSED_PARAM, char **argv)
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{
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enum {
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OPT_quiet = 0x1
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};
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unsigned opt;
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char *opt_o, *opt_f, *opt_p, *opt_t;
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struct timex txc;
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int i, ret;
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const char *descript;
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opt_complementary = "=0"; /* no valid non-option parameters */
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opt = getopt32(argv, "qo:f:p:t:",
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&opt_o, &opt_f, &opt_p, &opt_t);
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txc.modes = 0;
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//if (opt & 0x1) // -q
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if (opt & 0x2) { // -o
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txc.offset = xatol(opt_o);
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txc.modes |= ADJ_OFFSET_SINGLESHOT;
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}
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if (opt & 0x4) { // -f
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txc.freq = xatol(opt_f);
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txc.modes |= ADJ_FREQUENCY;
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}
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if (opt & 0x8) { // -p
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txc.constant = xatol(opt_p);
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txc.modes |= ADJ_TIMECONST;
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}
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if (opt & 0x10) { // -t
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txc.tick = xatol(opt_t);
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txc.modes |= ADJ_TICK;
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}
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ret = adjtimex(&txc);
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if (ret < 0) {
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bb_perror_nomsg_and_die();
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}
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if (!(opt & OPT_quiet)) {
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const char *sep;
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const char *name;
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printf(
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" mode: %d\n"
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"-o offset: %ld us\n"
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"-f freq.adjust: %ld (65536 = 1ppm)\n"
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" maxerror: %ld\n"
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" esterror: %ld\n"
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" status: %d (",
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txc.modes, txc.offset, txc.freq, txc.maxerror,
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txc.esterror, txc.status);
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/* representative output of next code fragment:
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* "PLL | PPSTIME"
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*/
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name = statlist_name;
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sep = "";
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for (i = 0; statlist_bit[i]; i++) {
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if (txc.status & statlist_bit[i]) {
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printf("%s%s", sep, name);
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sep = " | ";
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}
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name += strlen(name) + 1;
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}
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descript = "error";
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if (ret <= 5)
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descript = nth_string(ret_code_descript, ret);
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printf(")\n"
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"-p timeconstant: %ld\n"
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" precision: %ld us\n"
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" tolerance: %ld\n"
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"-t tick: %ld us\n"
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" time.tv_sec: %ld\n"
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" time.tv_usec: %ld\n"
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" return value: %d (%s)\n",
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txc.constant,
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txc.precision, txc.tolerance, txc.tick,
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(long)txc.time.tv_sec, (long)txc.time.tv_usec, ret, descript);
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}
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return 0;
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}
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