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1
: " "
926
..
..
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. :
- , ;
- ;
- ;
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- :
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- :
- , . . open, pipe, creat fcntl. . , fork. , fcntl, dup dup2.
, u_block . open creat, . fork . .
( ) . u_block . : . :
struct ufd
{
struct file *fp;
int flags;
}u_ufd[OPEN_MAX]
fcntl FD_CLOEXEC . dup . fork .
. - , , (O_RDONLY, O_WRONLY O_RDWR).
, , . /etc/security/limits 2000 ( ). ulimit setrlimit. OPEN_MAX.
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0, 1 2. :
0 .
1 .
2 .
. , 0 , 1 2 . .
- < ( ) > ( ), . , :
prog < FileX > FileY
0 1 . 0 FileX, 1 - FileY. 2 . , 0 , 1 2 - . , , .
4. :
sseg segment para stack 'stack'
dw 80 dup(?)
sseg ends
;----------------------------------------------------------
dseg segment 'data'
strout1 db 'vvedit ryadok',13,10,'$'
strout2 db 'symvoliv v ryadku: ','$'
strout3 db '------[vyvid informacii]------',13,10,'$'
crlf db 13,10,'$'
buff db 80,?, 80 DUP(' ')
buflen equ 80
stdout equ 1
filename db 'file1.txt',0
err1 db 'oshibka 3Ch',13,10,'$'
handle dw?
bytesinstr db 3 DUP(?),'$'
dseg ends
; ---------------------------------------------------------
cseg segment 'code'
assume cs:cseg, ds:dseg, ss:sseg, es:dseg
start: mov ax,dseg
mov ds,ax
mov es,ax
mov ah,3ch;
mov cx,0;
mov dx,offset filename;
int 21h
mov handle,ax;
jnc inputstr; CF
mov ah,9
lea dx,err1;
int 21h
jmp endprg
inputstr:;
mov ah,9
lea dx,strout1;
int 21h
mov ah,0ah;
lea dx,buff;
int 21h
mov bh,0
mov bl,byte ptr [buff+1]; BL
cmp bl,0;
je closehndl;
add bl,offset buff+2
mov byte ptr[bx],' '; CR
mov ah,9
lea dx,crlf;
int 21h
fop1:;
mov ah,40h;
mov bx,handle;
mov cx,buflen;
mov dx,offset buff+2;
int 21h
mov al,' ';20h;
mov di,offset buff+2;
mov cx,buflen;
cld; ( DF)
rep stosb;
jmp inputstr;
closehndl:;
mov ah,3eh;
mov bx,handle;
int 21h
mov ah,9
lea dx,crlf
int 21h
mov ah,9
lea dx,strout3
int 21h
call ReadFile;
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endprg:
mov ah,4Ch; dos
int 21h
;
ReadFile proc near
mov ah,3Dh;
mov al,2; /
mov dx,offset filename
int 21h
mov handle,ax;
readrec:
mov ah,3fh;
mov bx,handle;
mov cx,buflen;
mov dx,offset buff+2;
int 21h
cmp ax,0
je closehndl1; 0
mov cx,ax;
mov ah,40h;
mov bx,stdout; (CON)
mov dx,offset buff+2; ,
int 21h
mov ah,40h
mov bx,stdout
mov cx,2
mov dx,offset crlf;
int 21h
call Variant4;
jmp readrec;
closehndl1:;
mov ah,3eh;
mov bx,handle;
int 21h
ret
ReadFile endp
;
Variant4 proc near
mov cx,buflen
mov di,offset buff+2
mov ax,0
calcstr:
cmp byte ptr[di],' ';
je contlp
inc al;
contlp:
inc di;
loop calcstr; CX(CX=CX-1)
mov byte ptr[bytesinstr],' ';
mov byte ptr[bytesinstr+1],' ';
mov byte ptr[bytesinstr+2],' ';
mov bx,offset bytesinstr+2
call numstrin;
mov ah,9
lea dx,strout2
int 21h
mov ah,9
lea dx,bytesinstr;
int 21h
mov ah,9
lea dx,crlf
int 21h
ret
Variant4 endp
; :
; ---------------------------
; : AX - , BX -
numstrin proc near
mov dl,10;
contdiv:
;
div dl; AX DL
; AH, - AL
mov byte ptr [bx],ah
add byte ptr [bx],30h
dec bx;
cbw;
cmp al,0;
ja contdiv
ret
numstrin endp
cseg ends
end start
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, , . .
