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FUNC7H.ASM
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Assembly Source File
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1990-01-05
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1KB
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44 lines
Include multi.inc
Include model.inc
;==============================================================================
;
; CAS function 07h -- Open A File
;
; Format:
; int CASOpenFile (int handle, int file, BYTE queue)
; Input:
; handle of event, receive file number, queue to search
; Output:
; Returns file handle or negative error code
;==============================================================================
.CODE
CASOpenFile PROC arg1:WORD, arg2:WORD, arg3:BYTE
push bx ; save registers
push cx
push dx
mov ax,MUX ; load multiplex number
mov ah,al ; move into ah
mov al,07h ; CAS function 7
mov bx,arg1 ; event handle
mov cx,arg2 ; receive file number
mov dl,arg3 ; queue to search
int 2Fh
cmp ax,0 ; ax = 0?
jne FINISH ; open file failed, return err. code
mov ax,bx ; move file handle to ax
FINISH:
pop dx ; restore registers
pop cx
pop bx
ret
CASOpenFile endp
END