1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
/* 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: select PLATFORM_LINUX
//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;
}
|
