1 /* vi: set sw=4 ts=4: */
3 * adjtimex.c - read, and possibly modify, the Linux kernel `timex' variables.
5 * Originally written: October 1997
6 * Last hack: March 2001
7 * Copyright 1997, 2000, 2001 Larry Doolittle <LRDoolittle@lbl.gov>
9 * busyboxed 20 March 2001, Larry Doolittle <ldoolitt@recycle.lbl.gov>
11 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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"
19 //usage: "\n -q Quiet"
20 //usage: "\n -o OFF Time offset, microseconds"
21 //usage: "\n -f FREQ Frequency adjust, integer kernel units (65536 is 1ppm)"
22 //usage: "\n (positive values make clock run faster)"
23 //usage: "\n -t TICK Microseconds per tick, usually 10000"
24 //usage: "\n -p TCONST"
27 #include <sys/timex.h>
29 static const uint16_t statlist_bit[] = {
45 static const char statlist_name[] =
61 static const char ret_code_descript[] =
62 "clock synchronized" "\0"
63 "insert leap second" "\0"
64 "delete leap second" "\0"
65 "leap second in progress" "\0"
66 "leap second has occurred" "\0"
67 "clock not synchronized"
70 int adjtimex_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
71 int adjtimex_main(int argc UNUSED_PARAM, char **argv)
77 char *opt_o, *opt_f, *opt_p, *opt_t;
82 opt_complementary = "=0"; /* no valid non-option parameters */
83 opt = getopt32(argv, "qo:f:p:t:",
84 &opt_o, &opt_f, &opt_p, &opt_t);
86 //if (opt & 0x1) // -q
87 if (opt & 0x2) { // -o
88 txc.offset = xatol(opt_o);
89 txc.modes |= ADJ_OFFSET_SINGLESHOT;
91 if (opt & 0x4) { // -f
92 txc.freq = xatol(opt_f);
93 txc.modes |= ADJ_FREQUENCY;
95 if (opt & 0x8) { // -p
96 txc.constant = xatol(opt_p);
97 txc.modes |= ADJ_TIMECONST;
99 if (opt & 0x10) { // -t
100 txc.tick = xatol(opt_t);
101 txc.modes |= ADJ_TICK;
104 ret = adjtimex(&txc);
107 bb_perror_nomsg_and_die();
110 if (!(opt & OPT_quiet)) {
117 "-f frequency: %ld\n"
121 txc.modes, txc.offset, txc.freq, txc.maxerror,
122 txc.esterror, txc.status);
124 /* representative output of next code fragment:
126 name = statlist_name;
128 for (i = 0; statlist_bit[i]; i++) {
129 if (txc.status & statlist_bit[i]) {
131 fputs(" | ", stdout);
135 name += strlen(name) + 1;
140 descript = nth_string(ret_code_descript, ret);
142 "-p timeconstant: %ld\n"
146 " time.tv_sec: %ld\n"
147 " time.tv_usec: %ld\n"
148 " return value: %d (%s)\n",
150 txc.precision, txc.tolerance, txc.tick,
151 (long)txc.time.tv_sec, (long)txc.time.tv_usec, ret, descript);