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/* 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.
*/
//config:config ADJTIMEX
//config: bool "adjtimex (4.7 kb)"
//config: default y
//config: help
//config: Adjtimex reads and optionally sets adjustment parameters for
//config: the Linux clock adjustment algorithm.
//applet:IF_ADJTIMEX(APPLET_NOFORK(adjtimex, adjtimex, BB_DIR_SBIN, BB_SUID_DROP, adjtimex))
//kbuild:lib-$(CONFIG_ADJTIMEX) += adjtimex.o
//usage:#define adjtimex_trivial_usage
//usage: "[-q] [-o OFF] [-f FREQ] [-p TCONST] [-t TICK]"
//usage:#define adjtimex_full_usage "\n\n"
//usage: "Read or set kernel time variables. 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 -t TICK Microseconds per tick, usually 10000"
//usage: "\n (positive -t or -f values make clock run faster)"
//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[] ALIGN2 = {
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[] ALIGN1 =
"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[] ALIGN1 =
"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 ret;
const char *descript;
memset(&txc, 0, sizeof(txc));
opt = getopt32(argv, "^" "qo:f:p:t:"
"\0" "=0"/*no valid non-option args*/,
&opt_o, &opt_f, &opt_p, &opt_t
);
//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;
}
/* It's NOFORK applet because the code is very simple:
* just some printf. No opens, no allocs.
* If you need to make it more complex, feel free to downgrade to NOEXEC
*/
ret = adjtimex(&txc);
if (ret < 0)
bb_perror_nomsg_and_die();
if (!(opt & OPT_quiet)) {
const char *sep;
const char *name;
int i;
printf(
" mode: %d\n"
"-o offset: %ld us\n"
"-f freq.adjust: %ld (65536 = 1ppm)\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 = "";
for (i = 0; statlist_bit[i]; i++) {
if (txc.status & statlist_bit[i]) {
printf("%s%s", sep, name);
sep = " | ";
}
name += strlen(name) + 1;
}
descript = "error";
if (ret <= 5)
descript = nth_string(ret_code_descript, ret);
printf(")\n"
"-p timeconstant: %ld\n"
" precision: %ld us\n"
" tolerance: %ld\n"
"-t tick: %ld us\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;
}
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