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<TITLE>Int 21/AH=4Dh
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Int 21/AH=4Dh - DOS 2+ - GET RETURN CODE (ERRORLEVEL) -
AH = 4Dh
Return: AH = termination type
00h normal (INT 20,INT 21/AH=00h, or INT 21/AH=4Ch)
01h control-C abort
02h critical error abort
03h terminate and stay resident (INT 21/AH=31h or INT 27)
AL = return code
CF clear
Notes: the word in which DOS stores the return code is cleared after being
read by this function, so the return code can only be retrieved once
">
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<h2>Int 21/AH=4Dh
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<h3><font color=#C00040>DOS 2+ - GET RETURN CODE (ERRORLEVEL)</font></h3>
<PRE>
AH = 4Dh<br>
<p><b>Return:</b><br>AH = termination type
00h normal (INT 20,INT 21/AH=00h, or INT 21/AH=4Ch)
01h control-C abort
02h critical error abort
03h terminate and stay resident (INT 21/AH=31h or INT 27)
AL = return code
CF clear
</PRE>
<p><b>Notes:</b>
The word in which DOS stores the return code is cleared after being
read by this function, so the return code can only be retrieved once.
COMMAND.COM stores the return code of the last external command it
executed as ERRORLEVEL.
This call should not be used if the child was started with AX=4B04h;
use AH=8Ah instead.
The following sequence will close a Virtual DOS Machine under OS/2 2.0
through OS/2 Merlin (but may change in the future):
MOV AH,4Dh
INT 21h
HLT
DB 02h,0FDh
This sequence is the only way to close a specific VDM which was
booted from floppy or a disk image.
<p><b>See Also:</b>
<a href="rb-2939.htm" tppabs="http://www.ctyme.com/intr/rb-2939.htm">AH=4Bh</a> - <a href="rb-2974.htm" tppabs="http://www.ctyme.com/intr/rb-2974.htm">AH=4Ch</a> - <a href="rb-3255.htm" tppabs="http://www.ctyme.com/intr/rb-3255.htm">AH=8Ah</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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