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 or set kernel time variables. See adjtimex(2)\n"
18 //usage: "\n -q Quiet"
19 //usage: "\n -o OFF Time offset, microseconds"
20 //usage: "\n -f FREQ Frequency adjust, integer kernel units (65536 is 1ppm)"
21 //usage: "\n -t TICK Microseconds per tick, usually 10000"
22 //usage: "\n (positive -t or -f values make clock run faster)"
23 //usage: "\n -p TCONST"
27 # include <linux/timex.h>
29 # include <sys/timex.h>
32 static const uint16_t statlist_bit[] ALIGN2 = {
48 static const char statlist_name[] ALIGN1 =
64 static const char ret_code_descript[] ALIGN1 =
65 "clock synchronized" "\0"
66 "insert leap second" "\0"
67 "delete leap second" "\0"
68 "leap second in progress" "\0"
69 "leap second has occurred" "\0"
70 "clock not synchronized"
73 int adjtimex_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
74 int adjtimex_main(int argc UNUSED_PARAM, char **argv)
80 char *opt_o, *opt_f, *opt_p, *opt_t;
85 opt_complementary = "=0"; /* no valid non-option parameters */
86 opt = getopt32(argv, "qo:f:p:t:",
87 &opt_o, &opt_f, &opt_p, &opt_t);
89 //if (opt & 0x1) // -q
90 if (opt & 0x2) { // -o
91 txc.offset = xatol(opt_o);
92 txc.modes |= ADJ_OFFSET_SINGLESHOT;
94 if (opt & 0x4) { // -f
95 txc.freq = xatol(opt_f);
96 txc.modes |= ADJ_FREQUENCY;
98 if (opt & 0x8) { // -p
99 txc.constant = xatol(opt_p);
100 txc.modes |= ADJ_TIMECONST;
102 if (opt & 0x10) { // -t
103 txc.tick = xatol(opt_t);
104 txc.modes |= ADJ_TICK;
107 ret = adjtimex(&txc);
110 bb_perror_nomsg_and_die();
113 if (!(opt & OPT_quiet)) {
119 "-o offset: %ld us\n"
120 "-f freq.adjust: %ld (65536 = 1ppm)\n"
124 txc.modes, txc.offset, txc.freq, txc.maxerror,
125 txc.esterror, txc.status);
127 /* representative output of next code fragment:
130 name = statlist_name;
132 for (i = 0; statlist_bit[i]; i++) {
133 if (txc.status & statlist_bit[i]) {
134 printf("%s%s", sep, name);
137 name += strlen(name) + 1;
142 descript = nth_string(ret_code_descript, ret);
144 "-p timeconstant: %ld\n"
145 " precision: %ld us\n"
148 " time.tv_sec: %ld\n"
149 " time.tv_usec: %ld\n"
150 " return value: %d (%s)\n",
152 txc.precision, txc.tolerance, txc.tick,
153 (long)txc.time.tv_sec, (long)txc.time.tv_usec, ret, descript);