293 lines
16 KiB
HTML
293 lines
16 KiB
HTML
<HTML>
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<HEAD>
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<TITLE>Int 24
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</TITLE>
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<META NAME="Description" CONTENT="
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Int 24 - DOS 1+ - CRITICAL ERROR HANDLER -
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Notes: invoked when a critical (usually hardware) error is encountered by DOS
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(see #02543); should never be called directly
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when DOS terminates a program, it copies the previous value of the
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INT 24 vector out of the PSP (see #01378) and into the interrupt
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vector table
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SeeAlso: INT 21/AH=95h,INT 21/AH=59h/BX=0000h,INT 21/AH=92hPTS-DOS
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(Table 02543)
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Values critical error handler is called with:
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AH = type and processing flags (see #02544)
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">
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<BODY BGCOLOR="#FFD0A0">
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<center>
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<h2>Int 24
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</h2>
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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+ - CRITICAL ERROR HANDLER</font></h3>
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<p><b>Notes:</b>
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Invoked when a critical (usually hardware) error is encountered by DOS
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<a href="rb-4112.htm#Table2543" tppabs="http://www.ctyme.com/intr/rb-4112.htm#Table2543">(see #02543)</a>; should never be called directly.
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When DOS terminates a program, it copies the previous value of the
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INT 24 vector out of the PSP <a href="rb-2682.htm#Table1378" tppabs="http://www.ctyme.com/intr/rb-2682.htm#Table1378">(see #01378)</a> and into the interrupt
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vector table
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<p><b>See Also:</b>
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<a href="rb-3270.htm" tppabs="http://www.ctyme.com/intr/rb-3270.htm">INT 21/AH=95h</a> - <a href="rb-3012.htm" tppabs="http://www.ctyme.com/intr/rb-3012.htm">INT 21/AH=59h/BX=0000h</a> - <a href="rb-3267.htm" tppabs="http://www.ctyme.com/intr/rb-3267.htm">INT 21/AH=92h"PTS-DOS"</a>
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<PRE>
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<p>
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<a name=table2543></a>
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(Table 02543)
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Values critical error handler is called with:.
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AH = type and processing flags <a href="rb-4112.htm#Table2544" tppabs="http://www.ctyme.com/intr/rb-4112.htm#Table2544">(see #02544)</a>.
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AL = drive number if AH bit 7 clear.
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BP:SI -> device driver header <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 #01646 at INT 21/AH=52h)
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(BP:[SI+4] bit 15 set if character device).
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DI low byte contains error code if AH bit 7 set <a href="rb-4112.htm#Table2545" tppabs="http://www.ctyme.com/intr/rb-4112.htm#Table2545">(see #02545)</a>.
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<p><b>STACK:</b><br>DWORD return address for INT 24 call
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WORD flags pushed by INT 24
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WORD original AX on entry to INT 21
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WORD BX
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WORD CX
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WORD DX
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WORD SI
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WORD DI
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WORD BP
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WORD DS
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WORD ES
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DWORD return address for INT 21 call
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WORD flags pushed by INT 21<br>
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<p><b>Return:</b><br>AL = action code (see #02546)
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SS,SP,DS,ES,BX,CX,DX preserved
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</PRE>
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<p><b>Notes:</b>
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The only DOS calls the handler may make are INT 21/AH=01h-0Ch,30h,59h.
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If the handler returns to the application by popping the stack, DOS
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will be in an unstable state until the first call with AH > 0Ch.
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For DOS 3.1+, IGNORE (AL=00h) is turned into FAIL (AL=03h) on network
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critical errors.
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If IGNORE specified but not allowed, it is turned into FAIL.
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If RETRY specified but not allowed, it is turned into FAIL.
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If FAIL specified but not allowed, it is turned into ABORT.
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(DOS 3.0+) if a critical error occurs inside the critical error
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handler, the DOS call is automatically failed (AL set to 03h and
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the INT 24 call skipped).
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The initial critical error handler is located in the kernel and
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always results in FAIL. However, by default it is replaced by
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the critical error handler in the command interpreter when it
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loads. This can be suppressed (e.g. for BBS systems) by loading
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the primary DOS 3.00+ COMMAND.COM shell with the undocumented
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option /F 'Fail'. This syntax is also supported with PTS/DOS 6.51+,
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S/DOS 1.0+, and DR-OpenDOS 7.02+ (1997-11-13) COMMAND.COM, as well
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as 4DOS.COM/NDOS.COM. OpenDOS 7.01+ COMMAND.COM (1997-03-21)
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introduced this under /N, which is still supported by newer releases
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(although it has a slightly different meaning now).
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<p><b>BUG:</b>
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DR DOS COMMAND.COM before 1998-05-07 caused incorrect error messages
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to occur if the error code had a non-zero MSB (e.g. NWCDEX's
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"IO error reading from device" instead of the correct
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"not ready error"). This was fixed with the DR-OpenDOS 7.03
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COMMAND.COM now passing the full error code to any critical error
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handlers.
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<PRE>
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<p>
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Bitfields for critical error type and processing flags:
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<a name=table2544></a>
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Bit(s) Description (Table 02544)
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7 class.
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=0 disk I/O error.
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=1 -- if block device, bad FAT image in memory
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-- if char device, error code in DI
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6 unused
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5 Ignore allowed (DOS 3.0+)
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4 Retry allowed (DOS 3.0+)
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3 Fail allowed (DOS 3.0+)
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2-1 disk area of error.
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00 = DOS area 01 = FAT.
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10 = root dir 11 = data area
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0 set if write, clear if read
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</PRE>
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<p><b>Note:</b>
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Abort is always allowed
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<p><b>See Also:</b>
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#02545 - #02546
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<PRE>
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<p>
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<a name=table2545></a>
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(Table 02545)
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Values for critical error code:
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00h (0) write-protection violation attempted
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01h (1) unknown unit for driver
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02h (2) drive not ready
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03h (3) unknown command given to driver
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04h (4) data error (bad CRC)
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05h (5) bad device driver request structure length
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06h (6) seek error
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07h (7) unknown media type (non-DOS disk)
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08h (8) sector not found
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09h (9) printer out of paper
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0Ah (10) write fault
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0Bh (11) read fault
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0Ch (12) general failure
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0Dh (13) (DOS 3.0+, "multitasking" DOS, PTS-DOS & S/DOS) sharing violation
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0Eh (14) (DOS 3.0+) lock violation
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0Fh (15) invalid disk change / wrong disk
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10h (16) (DOS 3.0+) FCB unavailable
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10h (16) uncertain media
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11h (17) (DOS 3.0+) sharing buffer overflow
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11h (17) character call interrupted
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12h (18) (DOS 4.0+) code page mismatch
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13h (19) (DOS 4.0+) out of input
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14h (20) (DOS 4.0+) insufficient disk space
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</PRE>
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<p><b>Note:</b>
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Critical error codes 00h..0Ch are the traditional codes reported
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through INT 24. These code assignments are mapped to error codes
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13h..1Fh reported by INT21/AH=59h <a href="rb-3012.htm#Table1680" tppabs="http://www.ctyme.com/intr/rb-3012.htm#Table1680">(see #01680)</a>. Similarly, the
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DOS 3.x critical error codes 0Dh..11h are mapped to INT21/AH=59h
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error codes 20h..24h, however, the DOS 4.0+ critical error codes are
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not mapped.
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<p><b>BUG:</b>
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Paragon Technology Systems' S/DOS 1.0 sources (a stripped down issue
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of PTS-DOS 6.51 with sources on CD) erroneously list DOS INT 24
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error codes 12h..14h as 11h..13h, however, since the sources do not
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make use of these defines, this seems to be only a documentation
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error.
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<p><b>See Also:</b>
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#02544 - #02546 - #01680
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<PRE>
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<p>
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<a name=table2546></a>
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(Table 02546)
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Values for critical error handler action code:
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00h ignore error and continue processing request
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01h retry operation
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02h terminate program as though INT 21/AH=4Ch called (INT 20h for DOS 1.x)
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03h fail system call in progress (DOS 3+)
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</PRE>
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<p><b>See Also:</b>
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#02544 - #02546
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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-24.htm" tppabs="http://www.ctyme.com/intr/int-24.htm">
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Int 24h</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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