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bbc98d32 KS |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010-2012 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <assert.h> | |
23 | #include <string.h> | |
24 | #include <unistd.h> | |
25 | #include <errno.h> | |
26 | #include <stdlib.h> | |
27 | #include <signal.h> | |
28 | #include <stdio.h> | |
29 | #include <sys/types.h> | |
30 | #include <sys/stat.h> | |
31 | #include <fcntl.h> | |
32 | #include <sys/ioctl.h> | |
33 | #include <stdarg.h> | |
34 | #include <ctype.h> | |
35 | #include <sys/prctl.h> | |
36 | #include <sys/time.h> | |
37 | #include <linux/rtc.h> | |
38 | ||
39 | #include "macro.h" | |
40 | #include "util.h" | |
41 | #include "log.h" | |
42 | #include "strv.h" | |
43 | #include "hwclock.h" | |
a5c32cff | 44 | #include "fileio.h" |
bbc98d32 KS |
45 | |
46 | static int rtc_open(int flags) { | |
47 | int fd; | |
48 | DIR *d; | |
49 | ||
50 | /* First, we try to make use of the /dev/rtc symlink. If that | |
51 | * doesn't exist, we open the first RTC which has hctosys=1 | |
52 | * set. If we don't find any we just take the first RTC that | |
53 | * exists at all. */ | |
54 | ||
55 | fd = open("/dev/rtc", flags); | |
56 | if (fd >= 0) | |
57 | return fd; | |
58 | ||
59 | d = opendir("/sys/class/rtc"); | |
60 | if (!d) | |
61 | goto fallback; | |
62 | ||
63 | for (;;) { | |
64 | char *p, *v; | |
7d5e9c0f LP |
65 | struct dirent *de; |
66 | union dirent_storage buf; | |
bbc98d32 KS |
67 | int r; |
68 | ||
7d5e9c0f | 69 | r = readdir_r(d, &buf.de, &de); |
bbc98d32 KS |
70 | if (r != 0) |
71 | goto fallback; | |
72 | ||
73 | if (!de) | |
74 | goto fallback; | |
75 | ||
76 | if (ignore_file(de->d_name)) | |
77 | continue; | |
78 | ||
b7def684 | 79 | p = strjoin("/sys/class/rtc/", de->d_name, "/hctosys", NULL); |
bbc98d32 KS |
80 | if (!p) { |
81 | closedir(d); | |
82 | return -ENOMEM; | |
83 | } | |
84 | ||
85 | r = read_one_line_file(p, &v); | |
86 | free(p); | |
87 | ||
88 | if (r < 0) | |
89 | continue; | |
90 | ||
91 | r = parse_boolean(v); | |
92 | free(v); | |
93 | ||
94 | if (r <= 0) | |
95 | continue; | |
96 | ||
97 | p = strappend("/dev/", de->d_name); | |
4eeebf70 LP |
98 | if (!p) { |
99 | closedir(d); | |
100 | return -ENOMEM; | |
101 | } | |
102 | ||
bbc98d32 KS |
103 | fd = open(p, flags); |
104 | free(p); | |
105 | ||
106 | if (fd >= 0) { | |
107 | closedir(d); | |
108 | return fd; | |
109 | } | |
110 | } | |
111 | ||
112 | fallback: | |
113 | if (d) | |
114 | closedir(d); | |
115 | ||
116 | fd = open("/dev/rtc0", flags); | |
117 | if (fd < 0) | |
118 | return -errno; | |
119 | ||
120 | return fd; | |
121 | } | |
122 | ||
123 | int hwclock_get_time(struct tm *tm) { | |
124 | int fd; | |
125 | int err = 0; | |
126 | ||
127 | assert(tm); | |
128 | ||
129 | fd = rtc_open(O_RDONLY|O_CLOEXEC); | |
130 | if (fd < 0) | |
131 | return -errno; | |
132 | ||
133 | /* This leaves the timezone fields of struct tm | |
134 | * uninitialized! */ | |
135 | if (ioctl(fd, RTC_RD_TIME, tm) < 0) | |
136 | err = -errno; | |
137 | ||
138 | /* We don't know daylight saving, so we reset this in order not | |
139 | * to confused mktime(). */ | |
140 | tm->tm_isdst = -1; | |
141 | ||
142 | close_nointr_nofail(fd); | |
143 | ||
144 | return err; | |
145 | } | |
146 | ||
147 | int hwclock_set_time(const struct tm *tm) { | |
148 | int fd; | |
149 | int err = 0; | |
150 | ||
151 | assert(tm); | |
152 | ||
153 | fd = rtc_open(O_RDONLY|O_CLOEXEC); | |
154 | if (fd < 0) | |
155 | return -errno; | |
156 | ||
157 | if (ioctl(fd, RTC_SET_TIME, tm) < 0) | |
158 | err = -errno; | |
159 | ||
160 | close_nointr_nofail(fd); | |
161 | ||
162 | return err; | |
163 | } | |
a866073d | 164 | |
bbc98d32 | 165 | int hwclock_is_localtime(void) { |
8e2f9ebf | 166 | FILE _cleanup_fclose_ *f; |
bbc98d32 KS |
167 | |
168 | /* | |
169 | * The third line of adjtime is "UTC" or "LOCAL" or nothing. | |
170 | * # /etc/adjtime | |
171 | * 0.0 0 0 | |
172 | * 0 | |
173 | * UTC | |
174 | */ | |
175 | f = fopen("/etc/adjtime", "re"); | |
176 | if (f) { | |
177 | char line[LINE_MAX]; | |
178 | bool b; | |
179 | ||
180 | b = fgets(line, sizeof(line), f) && | |
181 | fgets(line, sizeof(line), f) && | |
182 | fgets(line, sizeof(line), f); | |
bbc98d32 KS |
183 | if (!b) |
184 | return -EIO; | |
185 | ||
186 | truncate_nl(line); | |
8e2f9ebf | 187 | return streq(line, "LOCAL"); |
bbc98d32 | 188 | |
bcb161b0 | 189 | } else if (errno != ENOENT) |
bbc98d32 KS |
190 | return -errno; |
191 | ||
8e2f9ebf | 192 | return 0; |
bbc98d32 KS |
193 | } |
194 | ||
72edcff5 | 195 | int hwclock_set_timezone(int *min) { |
bbc98d32 KS |
196 | const struct timeval *tv_null = NULL; |
197 | struct timespec ts; | |
198 | struct tm *tm; | |
19e65613 | 199 | int minutesdelta; |
bbc98d32 KS |
200 | struct timezone tz; |
201 | ||
202 | assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0); | |
203 | assert_se(tm = localtime(&ts.tv_sec)); | |
19e65613 | 204 | minutesdelta = tm->tm_gmtoff / 60; |
bbc98d32 | 205 | |
19e65613 | 206 | tz.tz_minuteswest = -minutesdelta; |
bbc98d32 KS |
207 | tz.tz_dsttime = 0; /* DST_NONE*/ |
208 | ||
209 | /* | |
210 | * If the hardware clock does not run in UTC, but in local time: | |
211 | * The very first time we set the kernel's timezone, it will warp | |
212 | * the clock so that it runs in UTC instead of local time. | |
213 | */ | |
214 | if (settimeofday(tv_null, &tz) < 0) | |
215 | return -errno; | |
216 | if (min) | |
19e65613 | 217 | *min = minutesdelta; |
bbc98d32 KS |
218 | return 0; |
219 | } | |
220 | ||
72edcff5 | 221 | int hwclock_reset_timezone(void) { |
bbc98d32 KS |
222 | const struct timeval *tv_null = NULL; |
223 | struct timezone tz; | |
224 | ||
225 | tz.tz_minuteswest = 0; | |
226 | tz.tz_dsttime = 0; /* DST_NONE*/ | |
227 | ||
72edcff5 KS |
228 | /* |
229 | * The very first time we set the kernel's timezone, it will warp | |
230 | * the clock. Do a dummy call here, so the time warping is sealed | |
231 | * and we set only the time zone with next call. | |
232 | */ | |
bbc98d32 KS |
233 | if (settimeofday(tv_null, &tz) < 0) |
234 | return -errno; | |
235 | ||
236 | return 0; | |
237 | } |