xref: /illumos-gate/usr/src/uts/common/syscall/ioctl.c (revision 2d6eb4a5)
17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate  * CDDL HEADER START
37c478bd9Sstevel@tonic-gate  *
47c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*da6c28aaSamw  * Common Development and Distribution License (the "License").
6*da6c28aaSamw  * You may not use this file except in compliance with the License.
77c478bd9Sstevel@tonic-gate  *
87c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
97c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
107c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
117c478bd9Sstevel@tonic-gate  * and limitations under the License.
127c478bd9Sstevel@tonic-gate  *
137c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
147c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
157c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
167c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
177c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
187c478bd9Sstevel@tonic-gate  *
197c478bd9Sstevel@tonic-gate  * CDDL HEADER END
207c478bd9Sstevel@tonic-gate  */
217c478bd9Sstevel@tonic-gate /*
22*da6c28aaSamw  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
237c478bd9Sstevel@tonic-gate  * Use is subject to license terms.
247c478bd9Sstevel@tonic-gate  */
257c478bd9Sstevel@tonic-gate 
267c478bd9Sstevel@tonic-gate /*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
277c478bd9Sstevel@tonic-gate /*	  All Rights Reserved  	*/
287c478bd9Sstevel@tonic-gate 
297c478bd9Sstevel@tonic-gate /*
307c478bd9Sstevel@tonic-gate  * Portions of this source code were derived from Berkeley 4.3 BSD
317c478bd9Sstevel@tonic-gate  * under license from the Regents of the University of California.
327c478bd9Sstevel@tonic-gate  */
337c478bd9Sstevel@tonic-gate 
347c478bd9Sstevel@tonic-gate #include <sys/param.h>
357c478bd9Sstevel@tonic-gate #include <sys/isa_defs.h>
367c478bd9Sstevel@tonic-gate #include <sys/types.h>
377c478bd9Sstevel@tonic-gate #include <sys/sysmacros.h>
387c478bd9Sstevel@tonic-gate #include <sys/cred.h>
397c478bd9Sstevel@tonic-gate #include <sys/systm.h>
407c478bd9Sstevel@tonic-gate #include <sys/errno.h>
417c478bd9Sstevel@tonic-gate #include <sys/ttold.h>
427c478bd9Sstevel@tonic-gate #include <sys/vnode.h>
437c478bd9Sstevel@tonic-gate #include <sys/file.h>
447c478bd9Sstevel@tonic-gate #include <sys/mode.h>
457c478bd9Sstevel@tonic-gate #include <sys/proc.h>
467c478bd9Sstevel@tonic-gate #include <sys/uio.h>
477c478bd9Sstevel@tonic-gate #include <sys/kmem.h>
487c478bd9Sstevel@tonic-gate #include <sys/filio.h>
497c478bd9Sstevel@tonic-gate #include <sys/sunddi.h>
507c478bd9Sstevel@tonic-gate #include <sys/debug.h>
517c478bd9Sstevel@tonic-gate #include <sys/int_limits.h>
527c478bd9Sstevel@tonic-gate #include <sys/model.h>
537c478bd9Sstevel@tonic-gate 
547c478bd9Sstevel@tonic-gate /*
557c478bd9Sstevel@tonic-gate  * I/O control.
567c478bd9Sstevel@tonic-gate  */
577c478bd9Sstevel@tonic-gate 
587c478bd9Sstevel@tonic-gate int
ioctl(int fdes,int cmd,intptr_t arg)597c478bd9Sstevel@tonic-gate ioctl(int fdes, int cmd, intptr_t arg)
607c478bd9Sstevel@tonic-gate {
617c478bd9Sstevel@tonic-gate 	file_t *fp;
627c478bd9Sstevel@tonic-gate 	int error = 0;
637c478bd9Sstevel@tonic-gate 	vnode_t *vp;
647c478bd9Sstevel@tonic-gate 	struct vattr vattr;
657c478bd9Sstevel@tonic-gate 	int32_t flag;
667c478bd9Sstevel@tonic-gate 	int rv = 0;
677c478bd9Sstevel@tonic-gate 
687c478bd9Sstevel@tonic-gate 	if ((fp = getf(fdes)) == NULL)
697c478bd9Sstevel@tonic-gate 		return (set_errno(EBADF));
707c478bd9Sstevel@tonic-gate 	vp = fp->f_vnode;
717c478bd9Sstevel@tonic-gate 
727c478bd9Sstevel@tonic-gate 	if (vp->v_type == VREG || vp->v_type == VDIR) {
737c478bd9Sstevel@tonic-gate 		/*
747c478bd9Sstevel@tonic-gate 		 * Handle these two ioctls for regular files and
757c478bd9Sstevel@tonic-gate 		 * directories.  All others will usually be failed
767c478bd9Sstevel@tonic-gate 		 * with ENOTTY by the VFS-dependent code.  System V
777c478bd9Sstevel@tonic-gate 		 * always failed all ioctls on regular files, but SunOS
787c478bd9Sstevel@tonic-gate 		 * supported these.
797c478bd9Sstevel@tonic-gate 		 */
807c478bd9Sstevel@tonic-gate 		switch (cmd) {
817c478bd9Sstevel@tonic-gate 		case FIONREAD: {
827c478bd9Sstevel@tonic-gate 			/*
837c478bd9Sstevel@tonic-gate 			 * offset is int32_t because that is what FIONREAD
847c478bd9Sstevel@tonic-gate 			 * is defined in terms of.  We cap at INT_MAX as in
857c478bd9Sstevel@tonic-gate 			 * other cases for this ioctl.
867c478bd9Sstevel@tonic-gate 			 */
877c478bd9Sstevel@tonic-gate 			int32_t offset;
887c478bd9Sstevel@tonic-gate 
897c478bd9Sstevel@tonic-gate 			vattr.va_mask = AT_SIZE;
90*da6c28aaSamw 			error = VOP_GETATTR(vp, &vattr, 0, fp->f_cred, NULL);
917c478bd9Sstevel@tonic-gate 			if (error) {
927c478bd9Sstevel@tonic-gate 				releasef(fdes);
937c478bd9Sstevel@tonic-gate 				return (set_errno(error));
947c478bd9Sstevel@tonic-gate 			}
957c478bd9Sstevel@tonic-gate 			offset = MIN(vattr.va_size - fp->f_offset, INT_MAX);
967c478bd9Sstevel@tonic-gate 			if (copyout(&offset, (caddr_t)arg, sizeof (offset))) {
977c478bd9Sstevel@tonic-gate 				releasef(fdes);
987c478bd9Sstevel@tonic-gate 				return (set_errno(EFAULT));
997c478bd9Sstevel@tonic-gate 			}
1007c478bd9Sstevel@tonic-gate 			releasef(fdes);
1017c478bd9Sstevel@tonic-gate 			return (0);
1027c478bd9Sstevel@tonic-gate 			}
1037c478bd9Sstevel@tonic-gate 
1047c478bd9Sstevel@tonic-gate 		case FIONBIO:
1057c478bd9Sstevel@tonic-gate 			if (copyin((caddr_t)arg, &flag, sizeof (flag))) {
1067c478bd9Sstevel@tonic-gate 				releasef(fdes);
1077c478bd9Sstevel@tonic-gate 				return (set_errno(EFAULT));
1087c478bd9Sstevel@tonic-gate 			}
1097c478bd9Sstevel@tonic-gate 			mutex_enter(&fp->f_tlock);
1107c478bd9Sstevel@tonic-gate 			if (flag)
1117c478bd9Sstevel@tonic-gate 				fp->f_flag |= FNDELAY;
1127c478bd9Sstevel@tonic-gate 			else
1137c478bd9Sstevel@tonic-gate 				fp->f_flag &= ~FNDELAY;
1147c478bd9Sstevel@tonic-gate 			mutex_exit(&fp->f_tlock);
1157c478bd9Sstevel@tonic-gate 			releasef(fdes);
1167c478bd9Sstevel@tonic-gate 			return (0);
1177c478bd9Sstevel@tonic-gate 
1187c478bd9Sstevel@tonic-gate 		default:
1197c478bd9Sstevel@tonic-gate 			break;
1207c478bd9Sstevel@tonic-gate 		}
1217c478bd9Sstevel@tonic-gate 	}
1227c478bd9Sstevel@tonic-gate 
1237c478bd9Sstevel@tonic-gate 	/*
1247c478bd9Sstevel@tonic-gate 	 * ioctl() now passes in the model information in some high bits.
1257c478bd9Sstevel@tonic-gate 	 */
1267c478bd9Sstevel@tonic-gate 	flag = fp->f_flag | get_udatamodel();
127*da6c28aaSamw 	error = VOP_IOCTL(fp->f_vnode, cmd, arg, flag, CRED(), &rv, NULL);
1287c478bd9Sstevel@tonic-gate 	if (error != 0) {
1297c478bd9Sstevel@tonic-gate 		releasef(fdes);
1307c478bd9Sstevel@tonic-gate 		return (set_errno(error));
1317c478bd9Sstevel@tonic-gate 	}
1327c478bd9Sstevel@tonic-gate 	switch (cmd) {
1337c478bd9Sstevel@tonic-gate 	case FIONBIO:
1347c478bd9Sstevel@tonic-gate 		if (copyin((caddr_t)arg, &flag, sizeof (flag))) {
1357c478bd9Sstevel@tonic-gate 			releasef(fdes);
1367c478bd9Sstevel@tonic-gate 			return (set_errno(EFAULT));
1377c478bd9Sstevel@tonic-gate 		}
1387c478bd9Sstevel@tonic-gate 		mutex_enter(&fp->f_tlock);
1397c478bd9Sstevel@tonic-gate 		if (flag)
1407c478bd9Sstevel@tonic-gate 			fp->f_flag |= FNDELAY;
1417c478bd9Sstevel@tonic-gate 		else
1427c478bd9Sstevel@tonic-gate 			fp->f_flag &= ~FNDELAY;
1437c478bd9Sstevel@tonic-gate 		mutex_exit(&fp->f_tlock);
1447c478bd9Sstevel@tonic-gate 		break;
1457c478bd9Sstevel@tonic-gate 
1467c478bd9Sstevel@tonic-gate 	default:
1477c478bd9Sstevel@tonic-gate 		break;
1487c478bd9Sstevel@tonic-gate 	}
1497c478bd9Sstevel@tonic-gate 	releasef(fdes);
1507c478bd9Sstevel@tonic-gate 	return (rv);
1517c478bd9Sstevel@tonic-gate }
1527c478bd9Sstevel@tonic-gate 
1537c478bd9Sstevel@tonic-gate /*
1547c478bd9Sstevel@tonic-gate  * Old stty and gtty.  (Still.)
1557c478bd9Sstevel@tonic-gate  */
1567c478bd9Sstevel@tonic-gate int
stty(int fdes,intptr_t arg)1577c478bd9Sstevel@tonic-gate stty(int fdes, intptr_t arg)
1587c478bd9Sstevel@tonic-gate {
1597c478bd9Sstevel@tonic-gate 	return (ioctl(fdes, TIOCSETP, arg));
1607c478bd9Sstevel@tonic-gate }
1617c478bd9Sstevel@tonic-gate 
1627c478bd9Sstevel@tonic-gate int
gtty(int fdes,intptr_t arg)1637c478bd9Sstevel@tonic-gate gtty(int fdes, intptr_t arg)
1647c478bd9Sstevel@tonic-gate {
1657c478bd9Sstevel@tonic-gate 	return (ioctl(fdes, TIOCGETP, arg));
1667c478bd9Sstevel@tonic-gate }
167