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| -rw-r--r-- | hurd/translator.mdwn | 1 | ||||
| -rw-r--r-- | hurd/translator/rtc.mdwn | 31 |
2 files changed, 32 insertions, 0 deletions
diff --git a/hurd/translator.mdwn b/hurd/translator.mdwn index 324c5f8c..fe669a12 100644 --- a/hurd/translator.mdwn +++ b/hurd/translator.mdwn @@ -121,6 +121,7 @@ The [[concept|concepts]] of translators creates its own problems, too: * [[term]] * [[checkperms]] * [[usermux]] +* [[rtc]] * ... diff --git a/hurd/translator/rtc.mdwn b/hurd/translator/rtc.mdwn new file mode 100644 index 00000000..7a917b46 --- /dev/null +++ b/hurd/translator/rtc.mdwn @@ -0,0 +1,31 @@ +[[!meta copyright="Copyright © 2025 Free Software Foundation, Inc."]] + +[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable +id="license" text="Permission is granted to copy, distribute and/or modify this +document under the terms of the GNU Free Documentation License, Version 1.2 or +any later version published by the Free Software Foundation; with no Invariant +Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license +is included in the section entitled [[GNU Free Documentation +License|/fdl]]."]]"""]] + +The *rtc* translator implements a real-time clock driver. It can be used to add +the `rtc` device files, with those files, we can access the underlying +real-time clock using `ioctl()`. The description of `ioctl()` can be found +[here](https://www.gnu.org/software/libc/manual/html_node/IOCTLs.html). + +The operation macros are required to access the real-time clock. They are +defined as `RTC_*` in `hurd/rtc.h`. + +The `hwclock` command from `util-linux` can use the `rtc` device files to +access the real-time clock devices. + +# Usage Example +Setup a `rtc` device file in `/tmp`: + + settrans -c /tmp/rtc /hurd/rtc + +Read the time value through the `rtc` device file: + + int fd = open("/tmp/rtc", O_RDONLY); + struct rtc_time time; + ioctl(fd, RTC_RD_TIME, &time); |