1 /* $OpenBSD: write.c,v 1.6 2003/08/11 06:23:09 deraadt Exp $ */ 2 /* $NetBSD: write.c,v 1.7 1996/06/21 20:29:30 pk Exp $ */ 3 4 /*- 5 * Copyright (c) 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * The Mach Operating System project at Carnegie-Mellon University. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)write.c 8.1 (Berkeley) 6/11/93 36 * 37 * 38 * Copyright (c) 1989, 1990, 1991 Carnegie Mellon University 39 * All Rights Reserved. 40 * 41 * Author: Alessandro Forin 42 * 43 * Permission to use, copy, modify and distribute this software and its 44 * documentation is hereby granted, provided that both the copyright 45 * notice and this permission notice appear in all copies of the 46 * software, derivative works or modified versions, and any portions 47 * thereof, and that both notices appear in supporting documentation. 48 * 49 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 50 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 51 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 52 * 53 * Carnegie Mellon requests users of this software to return to 54 * 55 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 56 * School of Computer Science 57 * Carnegie Mellon University 58 * Pittsburgh PA 15213-3890 59 * 60 * any improvements or extensions that they make and grant Carnegie the 61 * rights to redistribute these changes. 62 */ 63 64 #include <sys/param.h> 65 #include "stand.h" 66 67 ssize_t 68 write(int fd, void *dest, size_t bcount) 69 { 70 struct open_file *f = &files[fd]; 71 size_t resid; 72 73 if ((unsigned)fd >= SOPEN_MAX || !(f->f_flags & F_WRITE)) { 74 errno = EBADF; 75 return (-1); 76 } 77 if (f->f_flags & F_RAW) { 78 twiddle(); 79 errno = (f->f_dev->dv_strategy)(f->f_devdata, F_WRITE, 80 btodb(f->f_offset), bcount, dest, &resid); 81 if (errno) 82 return (-1); 83 f->f_offset += resid; 84 return (resid); 85 } 86 resid = bcount; 87 if ((errno = (f->f_ops->write)(f, dest, bcount, &resid))) 88 return (-1); 89 return (0); 90 } 91