A2osX/SYS/KERNEL.S.UNISTD.txt

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