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Autodocs
 Devices:
 audio.device
  ADCMD_ALLOCATE
  ADCMD_FINISH
  ADCMD_FREE
  ADCMD_LOCK
  ADCMD_PERVOL
  ADCMD_SETPREC
  ADCMD_WAITCYCLE
  AbortIO
  BeginIO
  CMD_CLEAR
  CMD_FLUSH
  CMD_READ
  CMD_RESET
  CMD_START
  CMD_STOP
  CMD_UPDATE
  CMD_WRITE
  CloseDevice
  Expunge
  OpenDevice
Include
GuruMeditation
Docs » Autodocs » audio.device » CloseDevice

NAME

       CloseDevice - terminate access to the audio device

SYNOPSIS

       CloseDevice(iORequest);
                       A1

FUNCTION

       The CloseDevice routine notifies the audio device that it will no
       longer be used.  It takes an I/O audio request block (IOAudio) and
       clears the device pointer (io_Device).  If there are any channels
       allocated with the same allocation key (ioa_AllocKey), CloseDevice
       frees (ADCMD_FREE) them. CloseDevice decrements the open count, and if
       it falls to zero and an expunge (Expunge) is pending, the device is
       expunged.

INPUTS

       iORequest   - pointer to audio request block (struct IOAudio)
               io_Device   - pointer to device node, must be set by (or
                             copied from I/O block set by) open (OpenDevice)
               io_Unit     - bit map of channels to free (ADCMD_FREE) (bits 0
                             thru 3 correspond to channels 0 thru 3)
               ioa_AllocKey- allocation key, used to free channels

RESULT

       iORequest - pointer to audio request block (struct IOAudio)
               io_Device   - set to -1
               io_Unit     - set to zero

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