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oldlinux-files/docs/interrupts/int-html/rb-2820.htm
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<TITLE>Int 21/AX=4400h
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Int 21/AX=4400h - -
INT 21 - DOS 2+ - IOCTL - GET DEVICE INFORMATION
AX = 4400h
BX = handle
Return: CF clear if successful
DX = device information word (see #01423)
AX destroyed
CF set on error
AX = error code (01h,05h,06h) (see #01680 at AH=59h/BX=0000h)
Notes: value in DH corresponds to high byte of device driver's attribute word
if handle refers to a character device
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<h2>Int 21/AX=4400h
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<PRE>
INT 21 - DOS 2+ - IOCTL - GET DEVICE INFORMATION
AX = 4400h
BX = handle<br>
<p><b>Return:</b><br>CF clear if successful
DX = device information word <a href="rb-2820.htm#Table1423" tppabs="http://www.ctyme.com/intr/rb-2820.htm#Table1423">(see #01423)</a>
AX destroyed
CF set on error
AX = error code (01h,05h,06h) <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>
Value in DH corresponds to high byte of device driver's attribute word
if handle refers to a character device.
Novell NetWare reportedly does not return a drive number in bits 5-0
for a disk file.
This function was not supported by Digital Research's DOS Plus
<p><b>See Also:</b>
<a href="rb-2821.htm" tppabs="http://www.ctyme.com/intr/rb-2821.htm">AX=4401h</a> - <a href="rb-4411.htm" tppabs="http://www.ctyme.com/intr/rb-4411.htm">INT 2F/AX=122Bh</a>
<PRE>
<p>
Bitfields for device information word:
<a name=table1423></a>
Bit(s) Description (Table 01423)
character device
14 device driver can process IOCTL requests (see AX=4402h"DOS 2+")
13 output until busy supported
11 driver supports OPEN/CLOSE calls
8 ??? (set by MS-DOS 6.2x KEYB)
7 set (indicates device)
6 EOF on input
5 raw (binary) mode
4 device is special (uses INT 29)
3 clock device
2 NUL device
1 standard output
0 standard input
disk file
15 file is remote (DOS 3.0+)
14 don't set file date/time on closing (DOS 3.0+)
11 media not removable
8 (DOS 4 only) generate INT 24 if no disk space on write or read past
end of file
7 clear (indicates file)
6 file has not been written
5-0 drive number (0 = A:)
</PRE>
<p><b>See Also:</b>
<a href="rb-4124.htm" tppabs="http://www.ctyme.com/intr/rb-4124.htm">INT 29</a>
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<b>Category: <a href="cat-010.htm" tppabs="http://www.ctyme.com/intr/cat-010.htm">
DOS Kernel</a>
- <a href="int-21.htm" tppabs="http://www.ctyme.com/intr/int-21.htm">
Int 21h</a>
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