path: root/miscutils/adjtimex.c (plain)
blob: 1bc05b5acee92a0bd7962a45169cb2ce01d03826

1	/* vi: set sw=4 ts=4: */
2	/*
3	* adjtimex.c - read, and possibly modify, the Linux kernel `timex' variables.
4	*
5	* Originally written: October 1997
6	* Last hack: March 2001
7	* Copyright 1997, 2000, 2001 Larry Doolittle <LRDoolittle@lbl.gov>
8	*
9	* busyboxed 20 March 2001, Larry Doolittle <ldoolitt@recycle.lbl.gov>
10	*
11	* Licensed under GPLv2 or later, see file LICENSE in this source tree.
12	*/
13
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"
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 (positive values make clock run faster)"
22	//usage: "\n -t TICK Microseconds per tick, usually 10000"
23	//usage: "\n -p TCONST"
24
25	#include "libbb.h"
26	#ifdef __BIONIC__
27	# include <linux/timex.h>
28	extern int adjtimex (struct timex *);
29	#else
30	# include <sys/timex.h>
31	#endif
32
33	static const uint16_t statlist_bit[] = {
34	STA_PLL,
35	STA_PPSFREQ,
36	STA_PPSTIME,
37	STA_FLL,
38	STA_INS,
39	STA_DEL,
40	STA_UNSYNC,
41	STA_FREQHOLD,
42	STA_PPSSIGNAL,
43	STA_PPSJITTER,
44	STA_PPSWANDER,
45	STA_PPSERROR,
46	STA_CLOCKERR,
47	0
48	};
49	static const char statlist_name[] =
50	"PLL" "\0"
51	"PPSFREQ" "\0"
52	"PPSTIME" "\0"
53	"FFL" "\0"
54	"INS" "\0"
55	"DEL" "\0"
56	"UNSYNC" "\0"
57	"FREQHOLD" "\0"
58	"PPSSIGNAL" "\0"
59	"PPSJITTER" "\0"
60	"PPSWANDER" "\0"
61	"PPSERROR" "\0"
62	"CLOCKERR"
63	;
64
65	static const char ret_code_descript[] =
66	"clock synchronized" "\0"
67	"insert leap second" "\0"
68	"delete leap second" "\0"
69	"leap second in progress" "\0"
70	"leap second has occurred" "\0"
71	"clock not synchronized"
72	;
73
74	int adjtimex_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
75	int adjtimex_main(int argc UNUSED_PARAM, char **argv)
76	{
77	enum {
78	OPT_quiet = 0x1
79	};
80	unsigned opt;
81	char *opt_o, *opt_f, *opt_p, *opt_t;
82	struct timex txc;
83	int i, ret;
84	const char *descript;
85
86	opt_complementary = "=0"; /* no valid non-option parameters */
87	opt = getopt32(argv, "qo:f:p:t:",
88	&opt_o, &opt_f, &opt_p, &opt_t);
89	txc.modes = 0;
90	//if (opt & 0x1) // -q
91	if (opt & 0x2) { // -o
92	txc.offset = xatol(opt_o);
93	txc.modes |= ADJ_OFFSET_SINGLESHOT;
94	}
95	if (opt & 0x4) { // -f
96	txc.freq = xatol(opt_f);
97	txc.modes |= ADJ_FREQUENCY;
98	}
99	if (opt & 0x8) { // -p
100	txc.constant = xatol(opt_p);
101	txc.modes |= ADJ_TIMECONST;
102	}
103	if (opt & 0x10) { // -t
104	txc.tick = xatol(opt_t);
105	txc.modes |= ADJ_TICK;
106	}
107
108	ret = adjtimex(&txc);
109
110	if (ret < 0) {
111	bb_perror_nomsg_and_die();
112	}
113
114	if (!(opt & OPT_quiet)) {
115	int sep;
116	const char *name;
117
118	printf(
119	" mode: %d\n"
120	"-o offset: %ld\n"
121	"-f frequency: %ld\n"
122	" maxerror: %ld\n"
123	" esterror: %ld\n"
124	" status: %d (",
125	txc.modes, txc.offset, txc.freq, txc.maxerror,
126	txc.esterror, txc.status);
127
128	/* representative output of next code fragment:
129	"PLL | PPSTIME" */
130	name = statlist_name;
131	sep = 0;
132	for (i = 0; statlist_bit[i]; i++) {
133	if (txc.status & statlist_bit[i]) {
134	if (sep)
135	fputs(" | ", stdout);
136	fputs(name, stdout);
137	sep = 1;
138	}
139	name += strlen(name) + 1;
140	}
141
142	descript = "error";
143	if (ret <= 5)
144	descript = nth_string(ret_code_descript, ret);
145	printf(")\n"
146	"-p timeconstant: %ld\n"
147	" precision: %ld\n"
148	" tolerance: %ld\n"
149	"-t tick: %ld\n"
150	" time.tv_sec: %ld\n"
151	" time.tv_usec: %ld\n"
152	" return value: %d (%s)\n",
153	txc.constant,
154	txc.precision, txc.tolerance, txc.tick,
155	(long)txc.time.tv_sec, (long)txc.time.tv_usec, ret, descript);
156	}
157
158	return 0;
159	}
160