1*df930be7Sderaadt /* $NetBSD: lseek.c,v 1.2 1994/10/26 05:44:51 cgd Exp $ */ 2*df930be7Sderaadt 3*df930be7Sderaadt /*- 4*df930be7Sderaadt * Copyright (c) 1993 5*df930be7Sderaadt * The Regents of the University of California. All rights reserved. 6*df930be7Sderaadt * 7*df930be7Sderaadt * This code is derived from software contributed to Berkeley by 8*df930be7Sderaadt * The Mach Operating System project at Carnegie-Mellon University. 9*df930be7Sderaadt * 10*df930be7Sderaadt * Redistribution and use in source and binary forms, with or without 11*df930be7Sderaadt * modification, are permitted provided that the following conditions 12*df930be7Sderaadt * are met: 13*df930be7Sderaadt * 1. Redistributions of source code must retain the above copyright 14*df930be7Sderaadt * notice, this list of conditions and the following disclaimer. 15*df930be7Sderaadt * 2. Redistributions in binary form must reproduce the above copyright 16*df930be7Sderaadt * notice, this list of conditions and the following disclaimer in the 17*df930be7Sderaadt * documentation and/or other materials provided with the distribution. 18*df930be7Sderaadt * 3. All advertising materials mentioning features or use of this software 19*df930be7Sderaadt * must display the following acknowledgement: 20*df930be7Sderaadt * This product includes software developed by the University of 21*df930be7Sderaadt * California, Berkeley and its contributors. 22*df930be7Sderaadt * 4. Neither the name of the University nor the names of its contributors 23*df930be7Sderaadt * may be used to endorse or promote products derived from this software 24*df930be7Sderaadt * without specific prior written permission. 25*df930be7Sderaadt * 26*df930be7Sderaadt * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27*df930be7Sderaadt * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28*df930be7Sderaadt * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29*df930be7Sderaadt * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30*df930be7Sderaadt * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31*df930be7Sderaadt * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32*df930be7Sderaadt * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33*df930be7Sderaadt * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34*df930be7Sderaadt * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35*df930be7Sderaadt * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36*df930be7Sderaadt * SUCH DAMAGE. 37*df930be7Sderaadt * 38*df930be7Sderaadt * @(#)lseek.c 8.1 (Berkeley) 6/11/93 39*df930be7Sderaadt * 40*df930be7Sderaadt * 41*df930be7Sderaadt * Copyright (c) 1989, 1990, 1991 Carnegie Mellon University 42*df930be7Sderaadt * All Rights Reserved. 43*df930be7Sderaadt * 44*df930be7Sderaadt * Author: Alessandro Forin 45*df930be7Sderaadt * 46*df930be7Sderaadt * Permission to use, copy, modify and distribute this software and its 47*df930be7Sderaadt * documentation is hereby granted, provided that both the copyright 48*df930be7Sderaadt * notice and this permission notice appear in all copies of the 49*df930be7Sderaadt * software, derivative works or modified versions, and any portions 50*df930be7Sderaadt * thereof, and that both notices appear in supporting documentation. 51*df930be7Sderaadt * 52*df930be7Sderaadt * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 53*df930be7Sderaadt * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 54*df930be7Sderaadt * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 55*df930be7Sderaadt * 56*df930be7Sderaadt * Carnegie Mellon requests users of this software to return to 57*df930be7Sderaadt * 58*df930be7Sderaadt * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 59*df930be7Sderaadt * School of Computer Science 60*df930be7Sderaadt * Carnegie Mellon University 61*df930be7Sderaadt * Pittsburgh PA 15213-3890 62*df930be7Sderaadt * 63*df930be7Sderaadt * any improvements or extensions that they make and grant Carnegie the 64*df930be7Sderaadt * rights to redistribute these changes. 65*df930be7Sderaadt */ 66*df930be7Sderaadt 67*df930be7Sderaadt #include "stand.h" 68*df930be7Sderaadt 69*df930be7Sderaadt off_t 70*df930be7Sderaadt lseek(fd, offset, where) 71*df930be7Sderaadt int fd; 72*df930be7Sderaadt off_t offset; 73*df930be7Sderaadt int where; 74*df930be7Sderaadt { 75*df930be7Sderaadt register struct open_file *f = &files[fd]; 76*df930be7Sderaadt 77*df930be7Sderaadt if ((unsigned)fd >= SOPEN_MAX || f->f_flags == 0) { 78*df930be7Sderaadt errno = EBADF; 79*df930be7Sderaadt return (-1); 80*df930be7Sderaadt } 81*df930be7Sderaadt 82*df930be7Sderaadt /* seek is not supported on raw devices */ 83*df930be7Sderaadt if (f->f_flags & F_RAW) { 84*df930be7Sderaadt errno = EOFFSET; 85*df930be7Sderaadt return ((off_t)-1); 86*df930be7Sderaadt } 87*df930be7Sderaadt 88*df930be7Sderaadt return (f->f_ops->seek)(f, offset, where); 89*df930be7Sderaadt } 90