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Annotation of 43BSDReno/sys/kern/tty_tty.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)tty_tty.c   7.9 (Berkeley) 6/21/90
        !             7:  */
        !             8: 
        !             9: /*
        !            10:  * Indirect driver for controlling tty.
        !            11:  */
        !            12: #include "param.h"
        !            13: #include "systm.h"
        !            14: #include "conf.h"
        !            15: #include "user.h"
        !            16: #include "ioctl.h"
        !            17: #include "tty.h"
        !            18: #include "proc.h"
        !            19: #include "vnode.h"
        !            20: #include "file.h"
        !            21: #include "uio.h"
        !            22: 
        !            23: #define cttyvp(p) ((p)->p_flag&SCTTY ? (p)->p_session->s_ttyvp : NULL)
        !            24: 
        !            25: /*ARGSUSED*/
        !            26: syopen(dev, flag)
        !            27:        dev_t dev;
        !            28:        int flag;
        !            29: {
        !            30:        struct vnode *ttyvp = cttyvp(u.u_procp);
        !            31:        int error;
        !            32: 
        !            33:        if (ttyvp == NULL)
        !            34:                return (ENXIO);
        !            35:        VOP_LOCK(ttyvp);
        !            36:        error = VOP_ACCESS(ttyvp,
        !            37:           (flag&FREAD ? VREAD : 0) | (flag&FWRITE ? VWRITE : 0), u.u_cred);
        !            38:        VOP_UNLOCK(ttyvp);
        !            39:        if (error)
        !            40:                return (error);
        !            41:        return (VOP_OPEN(ttyvp, flag, NOCRED));
        !            42: }
        !            43: 
        !            44: /*ARGSUSED*/
        !            45: syread(dev, uio, flag)
        !            46:        dev_t dev;
        !            47:        struct uio *uio;
        !            48: {
        !            49:        register struct vnode *ttyvp = cttyvp(u.u_procp);
        !            50:        int error;
        !            51: 
        !            52:        if (ttyvp == NULL)
        !            53:                return (ENXIO);
        !            54:        VOP_LOCK(ttyvp);
        !            55:        error = VOP_READ(ttyvp, uio, flag, NOCRED);
        !            56:        VOP_UNLOCK(ttyvp);
        !            57:        return (error);
        !            58: }
        !            59: 
        !            60: /*ARGSUSED*/
        !            61: sywrite(dev, uio, flag)
        !            62:        dev_t dev;
        !            63:        struct uio *uio;
        !            64: {
        !            65:        register struct vnode *ttyvp = cttyvp(u.u_procp);
        !            66:        int error;
        !            67: 
        !            68:        if (ttyvp == NULL)
        !            69:                return (ENXIO);
        !            70:        VOP_LOCK(ttyvp);
        !            71:        error = VOP_WRITE(ttyvp, uio, flag, NOCRED);
        !            72:        VOP_UNLOCK(ttyvp);
        !            73:        return (error);
        !            74: }
        !            75: 
        !            76: /*ARGSUSED*/
        !            77: syioctl(dev, cmd, addr, flag)
        !            78:        dev_t dev;
        !            79:        int cmd;
        !            80:        caddr_t addr;
        !            81:        int flag;
        !            82: {
        !            83:        struct vnode *ttyvp = cttyvp(u.u_procp);
        !            84: 
        !            85:        if (ttyvp == NULL)
        !            86:                return (ENXIO);
        !            87:        if (cmd == TIOCNOTTY) {
        !            88:                if (!SESS_LEADER(u.u_procp)) {
        !            89:                        u.u_procp->p_flag &= ~SCTTY;
        !            90:                        return (0);
        !            91:                } else
        !            92:                        return (EINVAL);
        !            93:        }
        !            94:        return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED));
        !            95: }
        !            96: 
        !            97: /*ARGSUSED*/
        !            98: syselect(dev, flag)
        !            99:        dev_t dev;
        !           100:        int flag;
        !           101: {
        !           102:        struct vnode *ttyvp = cttyvp(u.u_procp);
        !           103: 
        !           104:        if (ttyvp == NULL)
        !           105:                return (1);     /* try operation to get EOF/failure */
        !           106:        return (VOP_SELECT(ttyvp, flag, FREAD|FWRITE, NOCRED));
        !           107: }

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