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
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
/* vi: set sw=4 ts=4: */
/*
* Mini hwclock implementation for busybox
*
* Copyright (C) 2002 Robert Griebl <griebl@gmx.de>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include <sys/ioctl.h>
#include <sys/utsname.h>
#include <getopt.h>
#include "busybox.h"
/* Copied from linux/rtc.h to eliminate the kernel dependency */
struct linux_rtc_time {
int tm_sec;
int tm_min;
int tm_hour;
int tm_mday;
int tm_mon;
int tm_year;
int tm_wday;
int tm_yday;
int tm_isdst;
};
#define RTC_SET_TIME _IOW('p', 0x0a, struct linux_rtc_time) /* Set RTC time */
#define RTC_RD_TIME _IOR('p', 0x09, struct linux_rtc_time) /* Read RTC time */
#if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS
# ifndef _GNU_SOURCE
# define _GNU_SOURCE
# endif
#endif
static int xopen_rtc(int flags)
{
int rtc;
rtc = open("/dev/rtc", flags);
if (rtc < 0) {
rtc = open("/dev/misc/rtc", flags);
if (rtc < 0)
bb_perror_msg_and_die("cannot access RTC");
}
return rtc;
}
static time_t read_rtc(int utc)
{
struct tm tm;
char *oldtz = 0;
time_t t = 0;
int rtc = xopen_rtc(O_RDONLY);
memset(&tm, 0, sizeof(struct tm));
if (ioctl(rtc, RTC_RD_TIME, &tm) < 0 )
bb_perror_msg_and_die("cannot read time from RTC");
tm.tm_isdst = -1; /* not known */
close(rtc);
if (utc) {
oldtz = getenv("TZ");
setenv("TZ", "UTC 0", 1);
tzset();
}
t = mktime(&tm);
if (utc) {
if (oldtz)
setenv("TZ", oldtz, 1);
else
unsetenv("TZ");
tzset();
}
return t;
}
static void write_rtc(time_t t, int utc)
{
struct tm tm;
int rtc = xopen_rtc(O_WRONLY);
tm = *(utc ? gmtime(&t) : localtime(&t));
tm.tm_isdst = 0;
if (ioctl(rtc, RTC_SET_TIME, &tm) < 0)
bb_perror_msg_and_die("cannot set the RTC time");
close(rtc);
}
static int show_clock(int utc)
{
struct tm *ptm;
time_t t;
RESERVE_CONFIG_BUFFER(buffer, 64);
t = read_rtc(utc);
ptm = localtime(&t); /* Sets 'tzname[]' */
safe_strncpy(buffer, ctime(&t), 64);
if (buffer[0])
buffer[strlen(buffer) - 1] = 0;
//printf("%s %.6f seconds %s\n", buffer, 0.0, utc ? "" : (ptm->tm_isdst ? tzname[1] : tzname[0]));
printf( "%s %.6f seconds\n", buffer, 0.0);
RELEASE_CONFIG_BUFFER(buffer);
return 0;
}
static int to_sys_clock(int utc)
{
struct timeval tv = { 0, 0 };
const struct timezone tz = { timezone/60 - 60*daylight, 0 };
tv.tv_sec = read_rtc(utc);
if (settimeofday(&tv, &tz))
bb_perror_msg_and_die("settimeofday() failed");
return 0;
}
static int from_sys_clock(int utc)
{
struct timeval tv = { 0, 0 };
struct timezone tz = { 0, 0 };
if (gettimeofday(&tv, &tz))
bb_perror_msg_and_die("gettimeofday() failed");
write_rtc(tv.tv_sec, utc);
return 0;
}
#ifdef CONFIG_FEATURE_HWCLOCK_ADJTIME_FHS
# define ADJTIME_PATH "/var/lib/hwclock/adjtime"
#else
# define ADJTIME_PATH "/etc/adjtime"
#endif
static int check_utc(void)
{
int utc = 0;
FILE *f = fopen(ADJTIME_PATH, "r");
if (f) {
RESERVE_CONFIG_BUFFER(buffer, 128);
while (fgets(buffer, sizeof(buffer), f)) {
int len = strlen(buffer);
while (len && isspace(buffer[len - 1]))
len--;
buffer[len] = 0;
if (strncmp(buffer, "UTC", 3) == 0 ) {
utc = 1;
break;
}
}
fclose(f);
RELEASE_CONFIG_BUFFER(buffer);
}
return utc;
}
#define HWCLOCK_OPT_LOCALTIME 0x01
#define HWCLOCK_OPT_UTC 0x02
#define HWCLOCK_OPT_SHOW 0x04
#define HWCLOCK_OPT_HCTOSYS 0x08
#define HWCLOCK_OPT_SYSTOHC 0x10
int hwclock_main(int argc, char **argv );
int hwclock_main(int argc, char **argv )
{
unsigned opt;
int utc;
#if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS
static const struct option hwclock_long_options[] = {
{ "localtime", 0, 0, 'l' },
{ "utc", 0, 0, 'u' },
{ "show", 0, 0, 'r' },
{ "hctosys", 0, 0, 's' },
{ "systohc", 0, 0, 'w' },
{ 0, 0, 0, 0 }
};
applet_long_options = hwclock_long_options;
#endif
opt_complementary = "?:r--ws:w--rs:s--wr:l--u:u--l";
opt = getopt32(argc, argv, "lursw");
/* If -u or -l wasn't given check if we are using utc */
if (opt & (HWCLOCK_OPT_UTC | HWCLOCK_OPT_LOCALTIME))
utc = opt & HWCLOCK_OPT_UTC;
else
utc = check_utc();
if (opt & HWCLOCK_OPT_HCTOSYS) {
return to_sys_clock(utc);
}
else if (opt & HWCLOCK_OPT_SYSTOHC) {
return from_sys_clock(utc);
} else {
/* default HWCLOCK_OPT_SHOW */
return show_clock(utc);
}
}
|
