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oldlinux-files/docs/interrupts/int-html/rb-2822.htm
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<TITLE>Int 21/AX=4402h
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Int 21/AX=4402h - DOS 2+ - IOCTL - READ FROM CHARACTER DEVICE CONTROL CHANNEL -
AX = 4402h
BX = file handle referencing character device
CX = number of bytes to read
DS:DX - buffer
Return: CF clear if successful
AX = number of bytes actually read
CF set on error
AX = error code (01h,05h,06h,0Dh) (see #01680 at AH=59h/BX=0000h)
Notes: format of data is driver-specific
(also see separate entries below for some specific cases)
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<h2>Int 21/AX=4402h
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<h3><font color=#C00040>DOS 2+ - IOCTL - READ FROM CHARACTER DEVICE CONTROL CHANNEL</font></h3>
<PRE>
AX = 4402h
BX = file handle referencing character device
CX = number of bytes to read
DS:DX -> buffer<br>
<p><b>Return:</b><br>CF clear if successful
AX = number of bytes actually read
CF set on error
AX = error code (01h,05h,06h,0Dh) <a href="javascript:if(confirm('http://www.ctyme.com/intr/rb-0000.htm \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.ctyme.com/intr/rb-0000.htm#Table0'" tppabs="http://www.ctyme.com/intr/rb-0000.htm#Table0"></a>(see #01680 at AH=59h/BX=0000h)
</PRE>
<p><b>Notes:</b>
Format of data is driver-specific
(also see separate entries below for some specific cases).
This function was not supported by Digital Research's DOS Plus
<p><b>See Also:</b>
<a href="rb-2820.htm" tppabs="http://www.ctyme.com/intr/rb-2820.htm">AX=4400h</a> - <a href="rb-2854.htm" tppabs="http://www.ctyme.com/intr/rb-2854.htm">AX=4403h"DOS"</a> - <a href="rb-2871.htm" tppabs="http://www.ctyme.com/intr/rb-2871.htm">AX=4404h"DOS"</a> - <a href="rb-4411.htm" tppabs="http://www.ctyme.com/intr/rb-4411.htm">INT
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DOS Kernel</a>
- <a href="int-21.htm" tppabs="http://www.ctyme.com/intr/int-21.htm">
Int 21h</a>
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