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/*
* 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>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (Version 2,
* June 1991) as published by the Free Software Foundation. At the
* time of writing, that license was published by the FSF with the URL
* http://www.gnu.org/copyleft/gpl.html, and is incorporated herein by
* reference.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* This adjtimex(1) is very similar in intent to adjtimex(8) by Steven
* Dick <ssd@nevets.oau.org> and Jim Van Zandt <jrv@vanzandt.mv.com>
* (see http://metalab.unc.edu/pub/Linux/system/admin/time/adjtimex*).
* That version predates this one, and is _much_ bigger and more
* featureful. My independently written version was very similar to
* Steven's from the start, because they both follow the kernel timex
* structure. I further tweaked this version to be equivalent to Steven's
* where possible, but I don't like getopt_long, so the actual usage
* syntax is incompatible.
*
* Amazingly enough, my Red Hat 5.2 sys/timex (and sub-includes)
* don't actually give a prototype for adjtimex(2), so building
* this code (with -Wall) gives a warning. Later versions of
* glibc fix this issue.
*
* This program is too simple for a Makefile, just build with:
* gcc -Wall -O adjtimex.c -o adjtimex
*
* busyboxed 20 March 2001, Larry Doolittle <ldoolitt@recycle.lbl.gov>
* It will autosense if it is built in a busybox environment, based
* on the BB_VER preprocessor macro.
*/
#include <stdio.h>
#include <sys/types.h>
#include <stdlib.h>
#include <unistd.h>
#if __GNU_LIBRARY__ < 5
#include <sys/timex.h>
extern int adjtimex(struct timex *buf);
#else
#include <sys/timex.h>
#endif
#ifdef BB_VER
#include "busybox.h"
#endif
static struct {int bit; char *name;} statlist[] = {
{ STA_PLL, "PLL" },
{ STA_PPSFREQ, "PPSFREQ" },
{ STA_PPSTIME, "PPSTIME" },
{ STA_FLL, "FFL" },
{ STA_INS, "INS" },
{ STA_DEL, "DEL" },
{ STA_UNSYNC, "UNSYNC" },
{ STA_FREQHOLD, "FREQHOLD" },
{ STA_PPSSIGNAL, "PPSSIGNAL" },
{ STA_PPSJITTER, "PPSJITTER" },
{ STA_PPSWANDER, "PPSWANDER" },
{ STA_PPSERROR, "PPSERROR" },
{ STA_CLOCKERR, "CLOCKERR" },
{ 0, NULL } };
static char *ret_code_descript[] = {
"clock synchronized",
"insert leap second",
"delete leap second",
"leap second in progress",
"leap second has occurred",
"clock not synchronized" };
#ifdef BB_VER
#define main adjtimex_main
#else
void usage(char *prog)
{
fprintf(stderr,
"Usage: %s [ -q ] [ -o offset ] [ -f frequency ] [ -p timeconstant ] [ -t tick ]\n",
prog);
}
#define show_usage() usage(argv[0])
#endif
int main(int argc, char ** argv)
{
struct timex txc;
int quiet=0;
int c, i, ret, sep;
char *descript;
txc.modes=0;
for (;;) {
c = getopt( argc, argv, "qo:f:p:t:");
if (c == EOF) break;
switch (c) {
case 'q':
quiet=1;
break;
case 'o':
txc.offset = atoi(optarg);
txc.modes |= ADJ_OFFSET_SINGLESHOT;
break;
case 'f':
txc.freq = atoi(optarg);
txc.modes |= ADJ_FREQUENCY;
break;
case 'p':
txc.constant = atoi(optarg);
txc.modes |= ADJ_TIMECONST;
break;
case 't':
txc.tick = atoi(optarg);
txc.modes |= ADJ_TICK;
break;
default:
show_usage();
exit(1);
}
}
if (argc != optind) { /* no valid non-option parameters */
show_usage();
exit(1);
}
ret = adjtimex(&txc);
if (ret < 0) perror("adjtimex");
if (!quiet && ret>=0) {
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" */
sep=0;
for (i=0; statlist[i].name; i++) {
if (txc.status & statlist[i].bit) {
if (sep) fputs(" | ",stdout);
fputs(statlist[i].name,stdout);
sep=1;
}
}
descript = "error";
if (ret >= 0 && ret <= 5) descript = 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 (ret<0);
}
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