INT 21,5D - Critical Error Information (Undocumented, DOS 3.x+)

% See second reference below for more information about this interrupt

% information presented here is incomplete

AH = 5D

AL = 00 server function call (DOS 3.1+)

= 01 commit all files (DOS 3.1+)

= 02 SHARE: close file by name (DOS 3.1+)

= 03 SHARE: close all files for given computer (DOS 3.1+)

= 04 SHARE: close all files for given process (DOS 3.1+)

= 05 SHARE: get open file list entry (DOS 3.1+)

= 06 get address of DOS swappable area into DS:SI (DOS 3.0+)

= 07 get network redirected printer mode (DOS 3.1+)

= 08 set network redirected printer mode (DOS 3.1+)

= 09 flush network redirected printer output (DOS 3.1+)

= 0A set extended error information (DOS 3.1+)

= 0B get DOS swappable data areas (DOS 4.x+)

DS:DX = pointer to 18 byte DOS Parameter List (DPL, if AL=00)

= pointer to 9 byte data block of the form (AL=0A):

% Offset Size Description

00 word extended error code to set

02 dword pointer to driver address to set

06 byte action code to set

07 byte class code to set

08 byte locus code to set

on return:

DS:SI = (if AL was 6) address of critical flag of the form:

% Offset Size Description

00 word extended error code

02 byte action code

03 byte class code

04 byte pointer to driver address

- function 0 copies 18 bytes from DS:SI to the DOS internal

register-save area; this data will be placed in the registers

when DOS returns to the caller thereby circumventing the DOS

register save logic

- may be used by a TSR to prevent accidental changing of an error

code and causing problems in the foreground process

- see ~bibliography~ references for "Undocumented DOS" and "DOS

Programmers Reference"

- see ~INT 21,59~