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oldlinux-files/docs/interrupts/int-html/rb-2602.htm
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<TITLE>Int 21/AH=25h
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Int 21/AH=25h - DOS 1+ - SET INTERRUPT VECTOR -
AH = 25h
AL = interrupt number
DS:DX - new interrupt handler
Notes: this function is preferred over direct modification of the interrupt
vector table
some DOS extenders place an API on this function, as it is not
directly meaningful in protected mode
under DR DOS 5.0-6.0, this function does not use any of the
DOS-internal stacks and may thus be called at any time; however,
under Novell DOS 7.0 - DR-DOS 7.02, this function was not reentrant.
">
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<h2>Int 21/AH=25h
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<h3><font color=#C00040>DOS 1+ - SET INTERRUPT VECTOR</font></h3>
<PRE>
AH = 25h
AL = interrupt number
DS:DX -> new interrupt handler
</PRE>
<p><b>Notes:</b>
This function is preferred over direct modification of the interrupt
vector table.
Some DOS extenders place an API on this function, as it is not
directly meaningful in protected mode.
Under DR DOS 5.0-6.0, this function does not use any of the
DOS-internal stacks and may thus be called at any time; however,
under Novell DOS 7.0 - DR-DOS 7.02, this function was not reentrant.
Since 1998/05/29, DR-DOS 7.03 no longer uses any internal stacks and
tests for this function much earlier, to allow a minimal stack usage
of just two words in addition to the IRET frame, allowing it to be
called from INT 21h functions, specificially device drivers. This
fixes the MCS SMB client.
Novell NetWare (except the new DOS Requester) monitors the offset of
any INT 24 set, and if equal to the value at startup, substitutes
its own handler to allow handling of network errors; this introduces
the potential bug that any program whose INT 24 handler offset
happens to be the same as COMMAND.COM's will not have its INT 24
handler installed
<p><b>See Also:</b>
<a href="rb-2603.htm" tppabs="http://www.ctyme.com/intr/rb-2603.htm">AX=2501h</a> - <a href="rb-2740.htm" tppabs="http://www.ctyme.com/intr/rb-2740.htm">AH=35h</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>
- <a href="alpha-d.htm" tppabs="http://www.ctyme.com/intr/alpha-d.htm">
D</a>
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