Annotation of sys/kern/tty_tty.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: tty_tty.c,v 1.10 2007/03/15 10:22:30 art Exp $ */
! 2: /* $NetBSD: tty_tty.c,v 1.13 1996/03/30 22:24:46 christos Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 1982, 1986, 1991, 1993
! 6: * The Regents of the University of California. All rights reserved.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. Redistributions in binary form must reproduce the above copyright
! 14: * notice, this list of conditions and the following disclaimer in the
! 15: * documentation and/or other materials provided with the distribution.
! 16: * 3. Neither the name of the University nor the names of its contributors
! 17: * may be used to endorse or promote products derived from this software
! 18: * without specific prior written permission.
! 19: *
! 20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 30: * SUCH DAMAGE.
! 31: *
! 32: * @(#)tty_tty.c 8.2 (Berkeley) 9/23/93
! 33: */
! 34:
! 35: /*
! 36: * Indirect driver for controlling tty.
! 37: */
! 38: #include <sys/param.h>
! 39: #include <sys/systm.h>
! 40: #include <sys/ioctl.h>
! 41: #include <sys/proc.h>
! 42: #include <sys/tty.h>
! 43: #include <sys/vnode.h>
! 44: #include <sys/file.h>
! 45: #include <sys/conf.h>
! 46:
! 47:
! 48: #define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
! 49:
! 50: /*ARGSUSED*/
! 51: int
! 52: cttyopen(dev_t dev, int flag, int mode, struct proc *p)
! 53: {
! 54: struct vnode *ttyvp = cttyvp(p);
! 55: int error;
! 56:
! 57: if (ttyvp == NULL)
! 58: return (ENXIO);
! 59: vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p);
! 60: #ifdef PARANOID
! 61: /*
! 62: * Since group is tty and mode is 620 on most terminal lines
! 63: * and since sessions protect terminals from processes outside
! 64: * your session, this check is probably no longer necessary.
! 65: * Since it inhibits setuid root programs that later switch
! 66: * to another user from accessing /dev/tty, we have decided
! 67: * to delete this test. (mckusick 5/93)
! 68: */
! 69: error = VOP_ACCESS(ttyvp,
! 70: (flag&FREAD ? VREAD : 0) | (flag&FWRITE ? VWRITE : 0), p->p_ucred, p);
! 71: if (!error)
! 72: #endif /* PARANOID */
! 73: error = VOP_OPEN(ttyvp, flag, NOCRED, p);
! 74: VOP_UNLOCK(ttyvp, 0, p);
! 75: return (error);
! 76: }
! 77:
! 78: /*ARGSUSED*/
! 79: int
! 80: cttyread(dev_t dev, struct uio *uio, int flag)
! 81: {
! 82: struct proc *p = uio->uio_procp;
! 83: struct vnode *ttyvp = cttyvp(uio->uio_procp);
! 84: int error;
! 85:
! 86: if (ttyvp == NULL)
! 87: return (EIO);
! 88: vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p);
! 89: error = VOP_READ(ttyvp, uio, flag, NOCRED);
! 90: VOP_UNLOCK(ttyvp, 0, p);
! 91: return (error);
! 92: }
! 93:
! 94: /*ARGSUSED*/
! 95: int
! 96: cttywrite(dev_t dev, struct uio *uio, int flag)
! 97: {
! 98: struct proc *p = uio->uio_procp;
! 99: struct vnode *ttyvp = cttyvp(uio->uio_procp);
! 100: int error;
! 101:
! 102: if (ttyvp == NULL)
! 103: return (EIO);
! 104: vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p);
! 105: error = VOP_WRITE(ttyvp, uio, flag, NOCRED);
! 106: VOP_UNLOCK(ttyvp, 0, p);
! 107: return (error);
! 108: }
! 109:
! 110: /*ARGSUSED*/
! 111: int
! 112: cttyioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p)
! 113: {
! 114: struct vnode *ttyvp = cttyvp(p);
! 115:
! 116: if (ttyvp == NULL)
! 117: return (EIO);
! 118: if (cmd == TIOCSCTTY) /* XXX */
! 119: return (EINVAL);
! 120: if (cmd == TIOCNOTTY) {
! 121: if (!SESS_LEADER(p)) {
! 122: atomic_clearbits_int(&p->p_flag, P_CONTROLT);
! 123: return (0);
! 124: } else
! 125: return (EINVAL);
! 126: }
! 127: return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, p));
! 128: }
! 129:
! 130: /*ARGSUSED*/
! 131: int
! 132: cttypoll(dev_t dev, int events, struct proc *p)
! 133: {
! 134: struct vnode *ttyvp = cttyvp(p);
! 135:
! 136: if (ttyvp == NULL) /* try operation to get EOF/failure */
! 137: return (seltrue(dev, events, p));
! 138: return (VOP_POLL(ttyvp, events, p));
! 139: }
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