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<TITLE>Int 21/AH=80h
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Int 21/AH=80h - European MS-DOS 4.0 - AEXEC - EXECUTE PROGRAM IN BACKGROUND -
AH = 80h
CX = mode
0000h place child in zombie mode on exit to preserve exit code
0001h discard child process and exit code on termination
DS:DX - ASCIZ full program name
ES:BX - parameter block (as for AX=4B00h)
Return: CF clear if successful
AX = Command Subgroup ID (CSID)
CF set on error
AX = error code (see #01680 at AH=59h/BX=0000h)
">
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<h2>Int 21/AH=80h
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<h3><font color=#C00040>European MS-DOS 4.0 - AEXEC - EXECUTE PROGRAM IN BACKGROUND</font></h3>
<PRE>
AH = 80h
CX = mode
0000h place child in zombie mode on exit to preserve exit code
0001h discard child process and exit code on termination
DS:DX -> ASCIZ full program name
ES:BX -> parameter block (as for AX=4B00h)<br>
<p><b>Return:</b><br>CF clear if successful
AX = Command Subgroup ID (CSID)
CF set on error
AX = error code <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>Program:</b>
European MS-DOS 4.0 was written for Siemens in Germany and then used
by several other European OEMs; its release falls between mainstream
versions 3.2 and 3.3
<p><b>Desc:</b>
Asynchronously execute a program, creating a new process for it
<p><b>Notes:</b>
This function is called by the DETACH command.
There is a system-wide limit of 32 processes.
The CSID is used to identify all processes that have been spawned by
a given process, whether directly or indirectly.
Programs to be run in the background must use the new executable format
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Background processes may only perform asynchronous (background) EXECs,
either this function or AX=4B04h.
Background processes may execute INT 11, INT 12, INT 21, INT 2A, and
INT 2F at any time; they may execute INT 10 and INT 16 only while
they have opened a popup screen via INT 2F/AX=1401h; no other
interrupts may be executed from the background.
<PRE>
<p><b>Background processes may not use drive B:</b><br>Or overlay their code
segments.
See AX=8700h for an installation check.
The "NE" new executable format made its first appearance in European
MS-DOS 4.0
</PRE>
<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-3251.htm" tppabs="http://www.ctyme.com/intr/rb-3251.htm">AH=87h</a> - <a href="rb-4253.htm" tppabs="http://www.ctyme.com/intr/rb-4253.htm">INT 2F/AX=1400h"POPUP"</a>
<p>
<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>
- <a href="alpha-e.htm" tppabs="http://www.ctyme.com/intr/alpha-e.htm">
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