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rtc 667 B

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  1. .TH RTC 3
  2. .SH NAME
  3. rtc \- real-time clock and non-volatile RAM
  4. .SH SYNOPSIS
  5. .B bind #r /dev
  6. .PP
  7. .B /dev/rtc
  8. .br
  9. .B /dev/nvram
  10. .SH DESCRIPTION
  11. The
  12. .I rtc
  13. device supports devices
  14. with real-time clocks and non-volatile RAM.
  15. .PP
  16. The
  17. .B rtc
  18. file behaves just like
  19. .BR /dev/time
  20. (see
  21. .IR cons (3)).
  22. The real-time clock is maintained on-board;
  23. .B /dev/time
  24. is set from the file server. Neither is necessarily more accurate.
  25. .PP
  26. The
  27. .B nvram
  28. file provides (if permission allows)
  29. access to the local non-volatile RAM.
  30. For example,
  31. .IR boot (8)
  32. reads the machine's key
  33. from there
  34. (see
  35. .IR auth (8)).
  36. .SH SEE ALSO
  37. .IR auth (8),
  38. .IR boot (8)
  39. .SH SOURCE
  40. .B /sys/src/9/*/devrtc.c