175 lines
12 KiB
HTML
175 lines
12 KiB
HTML
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<TITLE>Int 21/AH=50h
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<META NAME="Description" CONTENT="
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Int 21/AH=50h - DOS 2+ internal - SET CURRENT PROCESS ID (SET PSP ADDRESS) -
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AH = 50h
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BX = segment of PSP for new process
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Notes: DOS uses the current PSP address to determine which processes own files
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and memory; it corresponds to process identifiers used by other OSs
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under DOS 2.x, this function cannot be invoked inside an INT 28h
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handler without setting the Critical Error flag
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under MS-DOS 3.0+ and DR DOS 3.41+, this function does not use any of
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the DOS-internal stacks and may thus be called at any time, even
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during another INT 21h call
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some Microsoft applications such as Quick C 2.51 use segments of 0000h
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">
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</HEAD>
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<BODY BGCOLOR="#FFD0A0">
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<center>
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<h2>Int 21/AH=50h
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</h2>
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</center><p>
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<img src="lhome.gif" tppabs="http://graphics.ctyme.com/gif/lhome.gif" border=0 alt=Ralf Brown Page></a>
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<td><a href="int.htm" tppabs="http://www.ctyme.com/intr/int.htm">Interrups</a></td>
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<td><a href="cat.htm" tppabs="http://www.ctyme.com/intr/cat.htm">Categories</a></td>
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<td><a href="alpha.htm" tppabs="http://www.ctyme.com/intr/alpha.htm">Contents</a></td>
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</td></table><p>
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<p><img src="rbline.gif" tppabs="http://graphics.ctyme.com/gif/rbline.gif" width="100%" alt="------"><p>
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<h3><font color=#C00040>DOS 2+ internal - SET CURRENT PROCESS ID (SET PSP ADDRESS)</font></h3>
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<PRE>
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AH = 50h
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BX = segment of PSP for new process
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</PRE>
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<p><b>Notes:</b>
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DOS uses the current PSP address to determine which processes own files
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and memory; it corresponds to process identifiers used by other OSs.
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Under DOS 2.x, this function cannot be invoked inside an INT 28h
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handler without setting the Critical Error flag.
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Under MS-DOS 3.0+ and DR DOS 3.41+, this function does not use any of
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the DOS-internal stacks and may thus be called at any time, even
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during another INT 21h call.
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Some Microsoft applications such as Quick C 2.51 use segments of 0000h
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and FFFFh and direct access to the SDA <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 at AX=5D06h) to
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test whether they are running under MS-DOS rather than a compatible
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OS; although one should only call this function with valid PSP
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addresses, any program hooking it should be prepared to handle
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invalid addresses.
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This function is supported by the OS/2 compatibility box.
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This call was undocumented prior to the release of DOS 5.0
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<p><b>See Also:</b>
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<a href="rb-2682.htm" tppabs="http://www.ctyme.com/intr/rb-2682.htm">AH=26h</a> - <a href="rb-2982.htm" tppabs="http://www.ctyme.com/intr/rb-2982.htm">AH=51h</a> - <a href="rb-3140.htm" tppabs="http://www.ctyme.com/intr/rb-3140.htm">AH=62h</a>
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<p>
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<b>Category: <a href="cat-010.htm" tppabs="http://www.ctyme.com/intr/cat-010.htm">
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DOS Kernel</a>
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- <a href="int-21.htm" tppabs="http://www.ctyme.com/intr/int-21.htm">
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Int 21h</a>
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- <a href="alpha-d.htm" tppabs="http://www.ctyme.com/intr/alpha-d.htm">
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D</a>
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<td><a href="cat.htm" tppabs="http://www.ctyme.com/intr/cat.htm">Categories</a></td>
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<td><a href="alpha.htm" tppabs="http://www.ctyme.com/intr/alpha.htm">Contents</a></td>
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