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author | Lennart Poettering <lennart@poettering.net> | 2024-04-19 19:20:40 +0200 |
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committer | Yu Watanabe <watanabe.yu+github@gmail.com> | 2024-04-20 02:15:07 +0200 |
commit | 5c81de98fcb533c0889ed6c6f6cd8640bb626360 (patch) | |
tree | e87696b9b397fdd09c4ac4379eade05f6176f59b /src/shared | |
parent | Merge pull request #31872 from tfg13/main (diff) | |
download | systemd-5c81de98fcb533c0889ed6c6f6cd8640bb626360.tar.xz systemd-5c81de98fcb533c0889ed6c6f6cd8640bb626360.zip |
timedate: handle gracefully if RTC lost time because of power loss
Apparently some RTC drivers return EINVAL in that case when we try to
read it. Handle that reasonably gracefully.
Fixes: #31854
Diffstat (limited to 'src/shared')
-rw-r--r-- | src/shared/clock-util.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/src/shared/clock-util.c b/src/shared/clock-util.c index b0cbe30072..37d02325b7 100644 --- a/src/shared/clock-util.c +++ b/src/shared/clock-util.c @@ -27,10 +27,11 @@ int clock_get_hwclock(struct tm *tm) { if (fd < 0) return -errno; - /* This leaves the timezone fields of struct tm - * uninitialized! */ + /* This leaves the timezone fields of struct tm uninitialized! */ if (ioctl(fd, RTC_RD_TIME, tm) < 0) - return -errno; + /* Some drivers return -EINVAL in case the time could not be kept, i.e. power loss + * happened. Let's turn that into a clearly recognizable error */ + return errno == EINVAL ? -ENODATA : -errno; /* We don't know daylight saving, so we reset this in order not * to confuse mktime(). */ |