write.c revision 87111
1114117Simp/* $NetBSD: write.c,v 1.7 1996/06/21 20:29:30 pk Exp $ */ 250476Speter 31592Srgrimes/*- 4156813Sru * Copyright (c) 1993 5156813Sru * The Regents of the University of California. All rights reserved. 653909Speter * 753909Speter * This code is derived from software contributed to Berkeley by 853909Speter * The Mach Operating System project at Carnegie-Mellon University. 953909Speter * 1053909Speter * Redistribution and use in source and binary forms, with or without 1153909Speter * modification, are permitted provided that the following conditions 12146286Sobrien * are met: 13124587Sru * 1. Redistributions of source code must retain the above copyright 1453909Speter * notice, this list of conditions and the following disclaimer. 15137675Sbz * 2. Redistributions in binary form must reproduce the above copyright 1653909Speter * notice, this list of conditions and the following disclaimer in the 17108574Sjmallett * documentation and/or other materials provided with the distribution. 1853909Speter * 3. All advertising materials mentioning features or use of this software 1953909Speter * must display the following acknowledgement: 20143026Strhodes * This product includes software developed by the University of 2153909Speter * California, Berkeley and its contributors. 22104385Smike * 4. Neither the name of the University nor the names of its contributors 2353909Speter * may be used to endorse or promote products derived from this software 2453909Speter * without specific prior written permission. 2553909Speter * 26143026Strhodes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27124587Sru * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2870922Sdougb * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29124587Sru * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 3053909Speter * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31101808Sdwmalone * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32117675Smarkm * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3353909Speter * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34171173Smlaier * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35137675Sbz * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 361592Srgrimes * SUCH DAMAGE. 37156813Sru * 38137675Sbz * @(#)write.c 8.1 (Berkeley) 6/11/93 39137675Sbz * 40137675Sbz * 41137675Sbz * Copyright (c) 1989, 1990, 1991 Carnegie Mellon University 42156813Sru * All Rights Reserved. 43171173Smlaier * 44126756Smlaier * Author: Alessandro Forin 45126756Smlaier * 46139106Sru * Permission to use, copy, modify and distribute this software and its 47124587Sru * documentation is hereby granted, provided that both the copyright 4853909Speter * notice and this permission notice appear in all copies of the 4953909Speter * software, derivative works or modified versions, and any portions 50156813Sru * thereof, and that both notices appear in supporting documentation. 51143107Sru * 52143026Strhodes * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 53143026Strhodes * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 54143026Strhodes * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 55156813Sru * 56124587Sru * Carnegie Mellon requests users of this software to return to 57124587Sru * 5838101Speter * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 5938101Speter * School of Computer Science 601592Srgrimes * Carnegie Mellon University 61 * Pittsburgh PA 15213-3890 62 * 63 * any improvements or extensions that they make and grant Carnegie the 64 * rights to redistribute these changes. 65 */ 66 67#include <sys/cdefs.h> 68__FBSDID("$FreeBSD: head/lib/libstand/write.c 87111 2001-11-30 05:54:30Z alfred $"); 69 70#include <sys/param.h> 71#include "stand.h" 72 73ssize_t 74write(fd, dest, bcount) 75 int fd; 76 void *dest; 77 size_t bcount; 78{ 79 register struct open_file *f = &files[fd]; 80 size_t resid; 81 82 if ((unsigned)fd >= SOPEN_MAX || !(f->f_flags & F_WRITE)) { 83 errno = EBADF; 84 return (-1); 85 } 86 if (f->f_flags & F_RAW) { 87 twiddle(); 88 errno = (f->f_dev->dv_strategy)(f->f_devdata, F_WRITE, 89 btodb(f->f_offset), bcount, dest, &resid); 90 if (errno) 91 return (-1); 92 f->f_offset += resid; 93 return (resid); 94 } 95 resid = bcount; 96 if ((errno = (f->f_ops->fo_write)(f, dest, bcount, &resid))) 97 return (-1); 98 return (bcount - resid); 99} 100