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Annotation of Net2/kern/tty_tty.c, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1982, 1986, 1991 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)tty_tty.c   7.15 (Berkeley) 5/28/91
        !            34:  */
        !            35: 
        !            36: /*
        !            37:  * Indirect driver for controlling tty.
        !            38:  */
        !            39: #include "param.h"
        !            40: #include "systm.h"
        !            41: #include "conf.h"
        !            42: #include "ioctl.h"
        !            43: #include "tty.h"
        !            44: #include "proc.h"
        !            45: #include "vnode.h"
        !            46: #include "file.h"
        !            47: 
        !            48: #define cttyvp(p) ((p)->p_flag&SCTTY ? (p)->p_session->s_ttyvp : NULL)
        !            49: 
        !            50: /*ARGSUSED*/
        !            51: cttyopen(dev, flag, mode, p)
        !            52:        dev_t dev;
        !            53:        int flag, mode;
        !            54:        struct proc *p;
        !            55: {
        !            56:        struct vnode *ttyvp = cttyvp(p);
        !            57:        int error;
        !            58: 
        !            59:        if (ttyvp == NULL)
        !            60:                return (ENXIO);
        !            61:        VOP_LOCK(ttyvp);
        !            62:        error = VOP_ACCESS(ttyvp,
        !            63:          (flag&FREAD ? VREAD : 0) | (flag&FWRITE ? VWRITE : 0), p->p_ucred, p);
        !            64:        if (!error)
        !            65:                error = VOP_OPEN(ttyvp, flag, NOCRED, p);
        !            66:        VOP_UNLOCK(ttyvp);
        !            67:        return (error);
        !            68: }
        !            69: 
        !            70: /*ARGSUSED*/
        !            71: cttyread(dev, uio, flag)
        !            72:        dev_t dev;
        !            73:        struct uio *uio;
        !            74: {
        !            75:        register struct vnode *ttyvp = cttyvp(uio->uio_procp);
        !            76:        int error;
        !            77: 
        !            78:        if (ttyvp == NULL)
        !            79:                return (EIO);
        !            80:        VOP_LOCK(ttyvp);
        !            81:        error = VOP_READ(ttyvp, uio, flag, NOCRED);
        !            82:        VOP_UNLOCK(ttyvp);
        !            83:        return (error);
        !            84: }
        !            85: 
        !            86: /*ARGSUSED*/
        !            87: cttywrite(dev, uio, flag)
        !            88:        dev_t dev;
        !            89:        struct uio *uio;
        !            90: {
        !            91:        register struct vnode *ttyvp = cttyvp(uio->uio_procp);
        !            92:        int error;
        !            93: 
        !            94:        if (ttyvp == NULL)
        !            95:                return (EIO);
        !            96:        VOP_LOCK(ttyvp);
        !            97:        error = VOP_WRITE(ttyvp, uio, flag, NOCRED);
        !            98:        VOP_UNLOCK(ttyvp);
        !            99:        return (error);
        !           100: }
        !           101: 
        !           102: /*ARGSUSED*/
        !           103: cttyioctl(dev, cmd, addr, flag, p)
        !           104:        dev_t dev;
        !           105:        int cmd;
        !           106:        caddr_t addr;
        !           107:        int flag;
        !           108:        struct proc *p;
        !           109: {
        !           110:        struct vnode *ttyvp = cttyvp(p);
        !           111: 
        !           112:        if (ttyvp == NULL)
        !           113:                return (EIO);
        !           114:        if (cmd == TIOCNOTTY) {
        !           115:                if (!SESS_LEADER(p)) {
        !           116:                        p->p_flag &= ~SCTTY;
        !           117:                        return (0);
        !           118:                } else
        !           119:                        return (EINVAL);
        !           120:        }
        !           121:        return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, p));
        !           122: }
        !           123: 
        !           124: /*ARGSUSED*/
        !           125: cttyselect(dev, flag, p)
        !           126:        dev_t dev;
        !           127:        int flag;
        !           128:        struct proc *p;
        !           129: {
        !           130:        struct vnode *ttyvp = cttyvp(p);
        !           131: 
        !           132:        if (ttyvp == NULL)
        !           133:                return (1);     /* try operation to get EOF/failure */
        !           134:        return (VOP_SELECT(ttyvp, flag, FREAD|FWRITE, NOCRED, p));
        !           135: }

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