## Virtual Device Driver Reference for OS/2

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### VDHCallOutDMA

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This function is used by the virtual DMA device driver (VDMA) to check how much DMA transfer has been completed, and to copy the contents from the temporary buffer to the DOS area.

If a virtual device driver owns a DMA channel, it must call the virtual DMA device driver for those interrupts that occur when a DMA request is pending on that channel. This service also indicates when the DOS session is done with the channel so that the channel can be given to another waiting DOS session.

    #include mvdm.h

    VOID    ;

    VDHCallOutDMA();