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<TITLE>Int 21/AH=3Fh
</TITLE>
<META NAME="Description" CONTENT="
Int 21/AH=3Fh - IFSHLP.SYS - GET ENTRY POINT -
AH = 3Fh
BX = file handle for device IFS$HLP$
CX = 0008h (size of buffer in bytes)
DS:DX - buffer for entry point record (see #01415)
Return: CF clear if successful
AX = number of bytes actually read (0 if at EOF before call)
CF set on error
AX = error code (05h,06h) (see #01680 at AH=59h/BX=0000h)
Program: IFSHLP.SYS is a support driver for Microsoft Windows for Workgroups
SeeAlso: AX=4402hIFSHLP
">
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<h2>Int 21/AH=3Fh
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<h3><font color=#C00040>IFSHLP.SYS - GET ENTRY POINT</font></h3>
<PRE>
AH = 3Fh
BX = file handle for device "IFS$HLP$"
CX = 0008h (size of buffer in bytes)
DS:DX -> buffer for entry point record <a href="rb-2789.htm#Table1415" tppabs="http://www.ctyme.com/intr/rb-2789.htm#Table1415">(see #01415)</a><br>
<p><b>Return:</b><br>CF clear if successful
AX = number of bytes actually read (0 if at EOF before call)
CF set on error
AX = error code (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>Program:</b>
IFSHLP.SYS is a support driver for Microsoft Windows for Workgroups
<p><b>See Also:</b>
<a href="rb-2851.htm" tppabs="http://www.ctyme.com/intr/rb-2851.htm">AX=4402h"IFSHLP"</a>
<PRE>
<p>
Format of IFSHLP.SYS entry point record:
<a name=table1415></a>
Offset Size Description (Table 01415)
00h 4 BYTEs (call) required signature if called via IOCTL
70h E9h 34h 37h for Windows 3.11
70h E9h 35h 37h for Windows 3.11
(ret) signature 34h 37h 70h EFh (Windows 3.11)
(ret) signature 35h 37h 70h EFh (Windows95)
04h DWORD (ret) pointer to FAR call entry point <a href="rb-2789.htm#Table1416" tppabs="http://www.ctyme.com/intr/rb-2789.htm#Table1416">(see #01416)</a>
<p>
<a name=table1416></a>
(Table 01416)
Call IFSHLP.SYS entry point with:.
<p><b>STACK:</b><br>WORD function number (00h-0Ch)
00h get ??? data
01h set interrupt intercepts (trap)
02h remove interrupt intercepts (untrap)
03h ??? LPT2
04h ??? LPT1
05h revector INT 2F to trap and remove trap for others
06h set ??? flag
07h clear ??? flag
08h get ??? flag word
---Windows 3.11 only---
09h ???
0Ah ???
0Bh ???
0Ch get ???
---if function 00h---<br>
<p><b>Return:</b><br>DX:AX -> ??? data (see #01417)
BX destroyed
---if function 01h---.
<p><b>STACK:</b><br>DWORD new intercept (trap) address<br>
<p><b>Return:</b><br>AX = status
0000h successful
0001h failed (already set)
DX = 0000h
BX destroyed
</PRE>
<p><b>Note:</b>
The trap handler is called with a function number in BX, and the
original BX on top of the stack; a null handler must perform a
POP BX and an IRET
---if function 02h---<br>
<PRE>
<p><b>Return:</b><br>AX = status
0000h successful
0001h failed (not set)
DX = 0000h
BX destroyed
---if function 03h,04h---.
<p><b>STACK:</b><br>WORD ???<br>
<p><b>Return:</b><br>AX = 0000h
DX = 0000h
BX destroyed
---if function 05h---
???<br>
<p><b>Return:</b><br>BX destroyed
---if function 06h---<br>
<p><b>Return:</b><br>AX = 0001h and DX = 0000h if already set
AX,DX unchanged if successful
BX destroyed
---if function 07h---<br>
<p><b>Return:</b><br>AX = 0001h and DX = 0000h if not set
AX,DX unchanged if successful
BX destroyed
---if function 08h---<br>
<p><b>Return:</b><br>DX = 0000h
AX = flags
<p><b>bit 0:</b><br>Set/cleared by functions 06h and 07h
<p><b>bit 1:</b><br>Trap is currently set (refer to functions 01h/02h).
BX destroyed
---if function 09h---<br>
<p><b>Return:</b><br>AX = status
0000h successful
0001h failed (already called)
BX destroyed
---if function 0Ah---.
<p><b>STACK:</b><br>WORD ???.
???<br>
<p><b>Return:</b><br>BX destroyed
---if function 0Bh---<br>
<p><b>Return:</b><br>AX = status
0000h successful
0001h failed (not set)
BX destroyed
---if function 0Ch---<br>
<p><b>Return:</b><br>AX = 0000h
ES:BX -> ??? data
---if function > 0Ch---<br>
<p><b>Return:</b><br>AX = 0001h
DX = 0000h
BX destroyed
<p>
Format of IFSHLP ??? data:
<a name=table1417></a>
Offset Size Description (Table 01417)
00h DWORD -> DOS Swappable Data Area <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 #01687,#01689)
02h WORD ??? offset in DOS data segment?
04h WORD offset in DOS data segment of current-PSP WORD
06h WORD ???
08h WORD ???
0Ah WORD ???
0Ch DWORD -> DOS List of Lists <a href="rb-2983.htm#Table1627" tppabs="http://www.ctyme.com/intr/rb-2983.htm#Table1627">(see #01627)</a>
10h ???
</PRE>
<p><b>See Also:</b>
#01416
<p>
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