A2osX/SYS/KERNEL.S.UNISTD.txt

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

				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

				lda #MLI.E.NODEV
*				sec				
				rts

.2				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