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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 /*
     22  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
     23  * Use is subject to license terms.
     24  */
     25 
     26 /*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
     27 /*	  All Rights Reserved  	*/
     28 
     29 /*
     30  * Portions of this source code were derived from Berkeley 4.3 BSD
     31  * under license from the Regents of the University of California.
     32  */
     33 
     34 #pragma ident	"@(#)ioctl.c	1.17	07/10/25 SMI"
     35 
     36 #include <sys/param.h>
     37 #include <sys/isa_defs.h>
     38 #include <sys/types.h>
     39 #include <sys/sysmacros.h>
     40 #include <sys/cred.h>
     41 #include <sys/systm.h>
     42 #include <sys/errno.h>
     43 #include <sys/ttold.h>
     44 #include <sys/vnode.h>
     45 #include <sys/file.h>
     46 #include <sys/mode.h>
     47 #include <sys/proc.h>
     48 #include <sys/uio.h>
     49 #include <sys/kmem.h>
     50 #include <sys/filio.h>
     51 #include <sys/sunddi.h>
     52 #include <sys/debug.h>
     53 #include <sys/int_limits.h>
     54 #include <sys/model.h>
     55 
     56 /*
     57  * I/O control.
     58  */
     59 
     60 int
     61 ioctl(int fdes, int cmd, intptr_t arg)
     62 {
     63 	file_t *fp;
     64 	int error = 0;
     65 	vnode_t *vp;
     66 	struct vattr vattr;
     67 	int32_t flag;
     68 	int rv = 0;
     69 
     70 	if ((fp = getf(fdes)) == NULL)
     71 		return (set_errno(EBADF));
     72 	vp = fp->f_vnode;
     73 
     74 	if (vp->v_type == VREG || vp->v_type == VDIR) {
     75 		/*
     76 		 * Handle these two ioctls for regular files and
     77 		 * directories.  All others will usually be failed
     78 		 * with ENOTTY by the VFS-dependent code.  System V
     79 		 * always failed all ioctls on regular files, but SunOS
     80 		 * supported these.
     81 		 */
     82 		switch (cmd) {
     83 		case FIONREAD: {
     84 			/*
     85 			 * offset is int32_t because that is what FIONREAD
     86 			 * is defined in terms of.  We cap at INT_MAX as in
     87 			 * other cases for this ioctl.
     88 			 */
     89 			int32_t offset;
     90 
     91 			vattr.va_mask = AT_SIZE;
     92 			error = VOP_GETATTR(vp, &vattr, 0, fp->f_cred, NULL);
     93 			if (error) {
     94 				releasef(fdes);
     95 				return (set_errno(error));
     96 			}
     97 			offset = MIN(vattr.va_size - fp->f_offset, INT_MAX);
     98 			if (copyout(&offset, (caddr_t)arg, sizeof (offset))) {
     99 				releasef(fdes);
    100 				return (set_errno(EFAULT));
    101 			}
    102 			releasef(fdes);
    103 			return (0);
    104 			}
    105 
    106 		case FIONBIO:
    107 			if (copyin((caddr_t)arg, &flag, sizeof (flag))) {
    108 				releasef(fdes);
    109 				return (set_errno(EFAULT));
    110 			}
    111 			mutex_enter(&fp->f_tlock);
    112 			if (flag)
    113 				fp->f_flag |= FNDELAY;
    114 			else
    115 				fp->f_flag &= ~FNDELAY;
    116 			mutex_exit(&fp->f_tlock);
    117 			releasef(fdes);
    118 			return (0);
    119 
    120 		default:
    121 			break;
    122 		}
    123 	}
    124 
    125 	/*
    126 	 * ioctl() now passes in the model information in some high bits.
    127 	 */
    128 	flag = fp->f_flag | get_udatamodel();
    129 	error = VOP_IOCTL(fp->f_vnode, cmd, arg, flag, CRED(), &rv, NULL);
    130 	if (error != 0) {
    131 		releasef(fdes);
    132 		return (set_errno(error));
    133 	}
    134 	switch (cmd) {
    135 	case FIONBIO:
    136 		if (copyin((caddr_t)arg, &flag, sizeof (flag))) {
    137 			releasef(fdes);
    138 			return (set_errno(EFAULT));
    139 		}
    140 		mutex_enter(&fp->f_tlock);
    141 		if (flag)
    142 			fp->f_flag |= FNDELAY;
    143 		else
    144 			fp->f_flag &= ~FNDELAY;
    145 		mutex_exit(&fp->f_tlock);
    146 		break;
    147 
    148 	default:
    149 		break;
    150 	}
    151 	releasef(fdes);
    152 	return (rv);
    153 }
    154 
    155 /*
    156  * Old stty and gtty.  (Still.)
    157  */
    158 int
    159 stty(int fdes, intptr_t arg)
    160 {
    161 	return (ioctl(fdes, TIOCSETP, arg));
    162 }
    163 
    164 int
    165 gtty(int fdes, intptr_t arg)
    166 {
    167 	return (ioctl(fdes, TIOCGETP, arg));
    168 }
    169