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<HTML>
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<HEAD>
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<TITLE>Int 21/AH=26h
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</TITLE>
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<META NAME="Description" CONTENT="
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Int 21/AH=26h - DOS 1+ - CREATE NEW PROGRAM SEGMENT PREFIX -
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AH = 26h
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DX = segment at which to create PSP (see #01378)
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Return: AL destroyed
|
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Notes: new PSP is updated with memory size information; INTs 22h, 23h, 24h
|
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taken from interrupt vector table; the parent PSP field is set to 0
|
||||
(DOS 2+) DOS assumes that the caller's CS is the segment of the PSP to
|
||||
copy
|
||||
BUG: DR DOS 6.0 original releases 05/1991 & 08/1991 had a problem where the
|
||||
segment from which the PSP was copied was incorrect so that the PSP
|
||||
was not filled correctly and did not contain the command tail. The
|
||||
">
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<META NAME="robots" CONTENT="none">
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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=26h
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</h2>
|
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</center><p>
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<table border=1 cellpadding=3 cellspacing=1>
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<td>
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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="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 1+ - CREATE NEW PROGRAM SEGMENT PREFIX</font></h3>
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<PRE>
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AH = 26h
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DX = segment at which to create PSP <a href="rb-2682.htm#Table1378" tppabs="http://www.ctyme.com/intr/rb-2682.htm#Table1378">(see #01378)</a><br>
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<p><b>Return:</b><br>AL destroyed
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</PRE>
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<p><b>Notes:</b>
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New PSP is updated with memory size information; INTs 22h, 23h, 24h
|
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taken from interrupt vector table; the parent PSP field is set to 0.
|
||||
(DOS 2+) DOS assumes that the caller's CS is the segment of the PSP to
|
||||
copy
|
||||
<p><b>BUG:</b>
|
||||
DR DOS 6.0 original releases 05/1991 & 08/1991 had a problem where the
|
||||
segment from which the PSP was copied was incorrect so that the PSP
|
||||
was not filled correctly and did not contain the command tail. The
|
||||
<PRE>
|
||||
<p><b>DR DOS 6.0 BDOS patch "PAT312" English (1992/01/07, XDIR /C:</b><br>A0C6h)
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and later "full" rebuilds fix this problem (see INT 21/AX=4452h).
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</PRE>
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<p><b>See Also:</b>
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<a href="rb-2939.htm" tppabs="http://www.ctyme.com/intr/rb-2939.htm">AH=4Bh</a> - <a href="rb-2980.htm" tppabs="http://www.ctyme.com/intr/rb-2980.htm">AH=50h</a> - <a href="rb-2982.htm" tppabs="http://www.ctyme.com/intr/rb-2982.htm">AH=51h</a> - <a href="rb-2989.htm" tppabs="http://www.ctyme.com/intr/rb-2989.htm">AH=55h</a> - <a href
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"javascript:if(confirm('http://www.ctyme.com/intr/<PRE \n\nThis file was not retrieved by Teleport Pro, because the server reports that this file cannot be found. \n\nDo you want to open it from the server?'))window.location='http://www.ctyme.com/intr/<PRE'" tppabs="http://www.ctyme.com/intr/<PRE">
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<p>
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Format of Program Segment Prefix (PSP):
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<a name=table1378></a>
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Offset Size Description (Table 01378)
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00h 2 BYTEs INT 20 instruction for CP/M CALL 0 program termination
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the CDh 20h here is often used as a signature for a valid PSP
|
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02h WORD segment of first byte beyond memory allocated to program
|
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04h BYTE (DOS) unused filler
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(OS/2) count of fake DOS version returns
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05h BYTE CP/M CALL 5 service request (FAR CALL to absolute 000C0h)
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</PRE>
|
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<p><b>BUG:</b>
|
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(DOS 2+ DEBUG) PSPs created by DEBUG point at 000BEh
|
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06h WORD CP/M compatibility--size of first segment for .COM files
|
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08h 2 BYTEs remainder of FAR JMP at 05h
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0Ah DWORD stored INT 22 termination address
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0Eh DWORD stored INT 23 control-Break handler address
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12h DWORD DOS 1.1+ stored INT 24 critical error handler address
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16h WORD segment of parent PSP
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18h 20 BYTEs DOS 2+ Job File Table, one byte per file handle, FFh = closed
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2Ch WORD DOS 2+ segment of environment for process <a href="rb-2682.htm#Table1379" tppabs="http://www.ctyme.com/intr/rb-2682.htm#Table1379">(see #01379)</a>
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2Eh DWORD DOS 2+ process's SS:SP on entry to last INT 21 call
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32h WORD DOS 3+ number of entries in JFT (default 20)
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34h DWORD DOS 3+ pointer to JFT (default PSP:0018h)
|
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38h DWORD DOS 3+ pointer to previous PSP (default FFFFFFFFh in 3.x)
|
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used by SHARE in DOS 3.3
|
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3Ch BYTE DOS 4+ (DBCS) interim console flag (see AX=6301h)
|
||||
Novell DOS 7 DBCS interim flag as set with AX=6301h
|
||||
(possibly also used by Far East MS-DOS 3.2-3.3)
|
||||
3Dh BYTE (APPEND) TrueName flag (see INT 2F/AX=B711h)
|
||||
<PRE>
|
||||
<p><b>3Eh BYTE (Novell NetWare) flag:</b><br>Next byte initialized if CEh
|
||||
(OS/2) capabilities flag
|
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3Fh BYTE (Novell NetWare) Novell task number if previous byte is CEh
|
||||
40h 2 BYTEs DOS 5+ version to return on INT 21/AH=30h
|
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42h WORD (MSWindows3) selector of next PSP (PDB) in linked list
|
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Windows keeps a linked list of Windows programs only
|
||||
44h WORD (MSWindows3) "PDB_Partition"
|
||||
46h WORD (MSWindows3) "PDB_NextPDB"
|
||||
48h BYTE (MSWindows3) bit 0 set if non-Windows application (WINOLDAP)
|
||||
49h BYTE unused by DOS versions <= 6.00
|
||||
4Ch WORD (MSWindows3) "PDB_EntryStack"
|
||||
4Eh 2 BYTEs unused by DOS versions <= 6.00
|
||||
50h 3 BYTEs DOS 2+ service request (INT 21/RETF instructions)
|
||||
53h 2 BYTEs unused in DOS versions <= 6.00
|
||||
55h 7 BYTEs unused in DOS versions <= 6.00; can be used to make first FCB
|
||||
into an extended FCB
|
||||
5Ch 16 BYTEs first default FCB, filled in from first commandline argument
|
||||
overwrites second FCB if opened
|
||||
6Ch 16 BYTEs second default FCB, filled in from second commandline argument
|
||||
overwrites beginning of commandline if opened
|
||||
7Ch 4 BYTEs unused
|
||||
80h 128 BYTEs commandline / default DTA
|
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command tail is BYTE for length of tail, N BYTEs for the tail,
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followed by a BYTE containing 0Dh
|
||||
</PRE>
|
||||
<p><b>Notes:</b>
|
||||
In DOS v3+, the limit on simultaneously open files may be increased by
|
||||
allocating memory for a new open file table, filling it with FFh,
|
||||
copying the first 20 bytes from the default table, and adjusting the
|
||||
pointer and count at 34h and 32h. However, DOS will only copy the
|
||||
first 20 file handles into a child PSP (including the one created on
|
||||
EXEC)..
|
||||
In an OS/2 DOS box, values of D0h-FEh in the open file table indicate
|
||||
device drivers.
|
||||
Network redirectors based on the original MS-Net implementation use
|
||||
values of 80h-FEh in the open file table to indicate remote files;
|
||||
Novell NetWare also uses values from FEh down to 80h or one more than
|
||||
FILES= (whichever is greater) to indicate remote files (except on
|
||||
OS/2, where is uses CFh down to 80h).
|
||||
MS-DOS 5.00 incorrectly fills the FCB fields when loading a program
|
||||
high; the first FCB is empty and the second contains the first
|
||||
parameter.
|
||||
Some DOS extenders place protected-mode values in various PSP fields
|
||||
such as the "parent" field, which can confuse PSP walkers. Always
|
||||
check either for the CDh 20h signature or that the suspected PSP is
|
||||
at the beginning of a memory block which owns itself (the preceding
|
||||
paragraph should be a valid MCB with "owner" the same as the
|
||||
suspected PSP)..
|
||||
Novell NetWare updates the fields at offsets 3Eh and 3Fh without
|
||||
checking that a legal PSP segment is current; see AH=50h for further
|
||||
discussion.
|
||||
For 4DOS and Windows95, the command tail may be more than 126
|
||||
characters; in that case, the length byte will be set to 7Fh (with
|
||||
an 0Dh in the 127th position at offset FFh), and the first 126
|
||||
characters will be stored in the PSP, with the entire command line
|
||||
in the environment variable CMDLINE; under at least some versions
|
||||
of 4DOS, the byte at offset FFh is *not* set to 0Dh, so there is no
|
||||
terminating carriage return in the PSP's command tail.
|
||||
<p><b>BUG:</b>
|
||||
When shelling out from the Borland Pascal 7.00 IDE, overly-long
|
||||
command lines will not be delimited by a 0Dh character, and the
|
||||
length byte is set to 80h! A workaround is to always patch in a
|
||||
0Dh at the last position of the command line buffer before scanning
|
||||
the command line.
|
||||
<PRE>
|
||||
<p>
|
||||
Format of environment block:
|
||||
<a name=table1379></a>
|
||||
Offset Size Description (Table 01379)
|
||||
00h N BYTEs first environment variable, ASCIZ string of form "var=value"
|
||||
N BYTEs second environment variable, ASCIZ string.
|
||||
...
|
||||
N BYTEs last environment variable, ASCIZ string of form "var=value".
|
||||
BYTE 00h
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||||
---DOS 3.0+ ---.
|
||||
WORD number of strings following environment (normally 1)
|
||||
N BYTEs ASCIZ full pathname of program owning this environment
|
||||
other strings may follow
|
||||
</PRE>
|
||||
<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-d.htm" tppabs="http://www.ctyme.com/intr/alpha-d.htm">
|
||||
D</a>
|
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|
||||
<p><img src="rbline.gif" tppabs="http://graphics.ctyme.com/gif/rbline.gif" width="100%" alt="------"><p>
|
||||
|
||||
<!-- Bottom Link End -->
|
||||
|
||||
</BODY>
|
||||
</HTML>
|
||||
Reference in New Issue
Block a user