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 }