A2osX/SYS/KERNEL.S.UNISTD.txt
2023-11-04 15:42:28 +01:00

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NEW
AUTO 3,1
*/--------------------------------------
* # open
* ## C
* `hFD open(const char *pathname, short int flags);`
* ## ASM
* `>PUSHW pathname`
* `>PUSHB flags`
* `>SYSCALL open`
* ## RETURN VALUE
* A = hFD
* REG File created on ProDOS : T=TXT,X=$0000
*\--------------------------------------
K.Open jsr PFT.CheckPath1
>PULLB IO.Open.FLAGS
lda #S.FI.T.TXT
sta IO.Open.TYPE
stz IO.Open.AUXTYPE
stz IO.Open.AUXTYPE+1
*--------------------------------------
UNISTD.Open ldx #5 /dev/
cpx K.MLI.PATH
bcs .2
.1 lda K.MLI.PATH,x
cmp UNISTD.DEV-1,x
bne .2
dex
bne .1
*--------------------------------------
* /dev/xxxxxx (CDEV,BDEV,DSOCK,SSOCK,PIPE)
*--------------------------------------
>LDYAI K.MLI.PATH+6 skip $/dev/
jsr K.GetDevByName
bcc .6
.2 ldx #1
.3 lda FILEs.hFD-1,x
beq .5
lda FILEs.hName-1,x
beq .5
jsr K.GetMemPtr
>STYA ZPPtr1
ldy #$ff
.4 iny
lda K.Buf256,y
cmp (ZPPtr1),y
bne .5
cmp #0
bne .4
stx IO.hFILE
lda FILEs.hFD-1,x
jsr DEV.GetPFD
bra .7
.5 inx
cpx #K.FILE.MAX+1
bcc .3
jmp FS.OPEN.REG
.6 jsr DEV.GetPDrv
.7 lda (pFD) #S.FD.T
tax
jmp (.8-2,x)
.8
* .DA STDIO.IOERR REG
.DA STDIO.IOERR DIR
.DA DEV.OPEN
.DA DEV.OPEN
.DA STDIO.IOERR LNK
.DA SOCK.OPEN
.DA SOCK.OPEN
.DA PIPE.OPEN
.9 rts
*/--------------------------------------
* # close
* ## C
* `int close(hFD fd);`
* ## ASM
* `lda fd`
* `>SYSCALL close`
*\--------------------------------------
K.Close jsr DEV.GetPFD
UNISTD.Close lda (pFD) #S.FD.T
tax
jmp (.1,x)
.1 .DA FS.CLOSE
.DA FS.CLOSE
.DA DEV.CLOSE
.DA DEV.CLOSE
.DA STDIO.IOERR LNK
.DA SOCK.CLOSE
.DA SOCK.CLOSE
.DA PIPE.CLOSE
*/--------------------------------------
* # read
* ## C
* `int read(hFD fd, void *buf, int count);`
* ## ASM
* `>PUSHB fd`
* `>PUSHW buf`
* `>PUSHW count`
* `>SYSCALL read`
* ## RETURN VALUE
* CC: Y,A = bytes read
* CS: A = EC
*\--------------------------------------
K.Read ldy #4 hFD
lda (pStack),y
jsr DEV.GetPFD
UNISTD.Read lda (pFD) #S.FD.T
tax
jmp (.1,x)
.1 .DA FS.READ.REG
.DA STDIO.IOERR DIR
.DA DEV.READ
.DA STDIO.IOERR BDEV
.DA STDIO.IOERR LNK
.DA STDIO.IOERR DSOCK
.DA SOCK.READ
.DA PIPE.READ
*/--------------------------------------
* # write
* ## C
* `int write(hFD fd, const void *buf, int count);`
* ## ASM
* `>PUSHB fd`
* `>PUSHW buf`
* `>PUSHW count`
* `>SYSCALL write`
* ## RETURN VALUE
* CC: Y,A = bytes written
* CS: A = EC
*\--------------------------------------
K.Write ldy #4 hFD
lda (pStack),y
jsr DEV.GetPFD
UNISTD.Write lda (pFD) #S.FD.T
tax
jmp (.1,x)
.1 .DA FS.WRITE.REG
.DA STDIO.IOERR DIR
.DA DEV.WRITE
.DA STDIO.IOERR BDEV
.DA STDIO.IOERR LNK
.DA STDIO.IOERR DSOCK
.DA SOCK.WRITE
.DA PIPE.WRITE
*/-------------------------------------
* # LSeek
* Set the file-position indicator for hFD
* ## C
* `int lseek( short int hFD, long offset, short int whence );`
* ## ASM
* `>PUSHB hFD`
* `>PUSHL offset`
* `>PUSHB whence`
* `>SYSCALL fseek`
*\-------------------------------------
*K.LSeek
*/--------------------------------------
* # ChOwn
* ## C
* `short int chown(const char *pathname, short int owner, short int group);`
* ## ASM
* `>PUSHW pathname`
* `>PUSHB owner`
* `>PUSHB group`
* `>SYSCALL chown`
* ## RETURN VALUE
*\--------------------------------------
K.ChOwn jsr PFT.CheckPath2
bcs .9
stz K.MLI.PARAMS+3+S.FIEX.ACL read mode
>MLICALL MLI.ACL
bcs .9
lda (pStack)
bmi .1
sta K.MLI.PARAMS+3+S.FIEX.ACL.GID
.1 ldy #1
lda (pStack),y
bmi .2
sta K.MLI.PARAMS+3+S.FIEX.ACL.UID
.2 lda #$57 write mode
sta K.MLI.PARAMS+3+S.FIEX.ACL
>MLICALL MLI.ACL
.9 >RET 4
*--------------------------------------
UNISTD.DEV .AS "/dev/"
*--------------------------------------
MAN
SAVE usr/src/sys/kernel.s.unistd
LOAD usr/src/sys/kernel.s
ASM