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apm 1.8 KB

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  1. .TH APM 8
  2. .SH NAME
  3. apm \- Advanced Power Management 1.2 BIOS interface
  4. .SH SYNOPSIS
  5. .I (in plan9.ini)
  6. .B apm0=
  7. .PP
  8. bind -a '#P' /dev
  9. .PP
  10. .B aux/apm
  11. [
  12. .B -d
  13. .I device
  14. ]
  15. [
  16. .B -m
  17. .I mountpoint
  18. ]
  19. [
  20. .B -s
  21. .I service
  22. ]
  23. .SH DESCRIPTION
  24. .I Aux/apm
  25. presents at
  26. .I mountpoint
  27. (default
  28. .BR /mnt/apm )
  29. an interface to the APM 1.2 BIOS
  30. (see
  31. .IR apm (3))
  32. .I device
  33. (the default is to try
  34. .BR /dev/apm ,
  35. followed by
  36. .BR #P/apm ).
  37. If a
  38. .I service
  39. is specified, the interface will be
  40. posted at
  41. .BI /srv/ service
  42. as well.
  43. .PP
  44. The directory contains the following files.
  45. .TP
  46. .B battery
  47. Contains one line for each battery in the system.
  48. Each line lists three fields: the status (a string, one of
  49. .BR unknown ,
  50. .BR high ,
  51. .BR low ,
  52. .BR critical ,
  53. or
  54. .BR charging ),
  55. the percent charge remaining, and
  56. an estimate of the amount of time left in seconds.
  57. If either or both of the last two are unknown,
  58. the corresponding field will be zero.
  59. .TP
  60. .B ctl
  61. The
  62. .B ctl
  63. file is used to set power management modes for
  64. various parts of the system.
  65. Control messages are of the form
  66. .RI `` device " " verb ,''
  67. where
  68. .I device
  69. is one of
  70. .BR system ,
  71. .BR display ,
  72. .BR storage ,
  73. .BR lpt ,
  74. .BR eia ,
  75. .BR network ,
  76. and
  77. .BR pcmcia ,
  78. and
  79. .I verb is one of
  80. .BR enable ,
  81. .BR disable ,
  82. .BR standby ,
  83. and
  84. .BR on .
  85. .B Enable
  86. and
  87. .B disable
  88. control whether power management is active
  89. for the device, while
  90. .B standby
  91. puts the device into standby mode
  92. and
  93. .B on
  94. brings it back to full power.
  95. .TP
  96. .B event
  97. Reads from this file will block until an APM event
  98. has occurred.
  99. A large enough read is guaranteed to return
  100. an integral number of textual event descriptions, one per line.
  101. .SH SOURCE
  102. .B /sys/src/cmd/aux/apm.c
  103. .br
  104. .B /acme/bin/Battery
  105. .SH BUGS
  106. The verbs
  107. .B suspend
  108. and
  109. .B off
  110. should be supported but doing so requires
  111. nontrivial help from the kernel.