xref: /minix3/sys/lib/libsa/write.c (revision 58a2b0008e28f606a7f7f5faaeaba4faac57a1ea)
1*58a2b000SEvgeniy Ivanov /*	$NetBSD: write.c,v 1.15 2007/12/02 04:59:26 tsutsui Exp $	*/
2*58a2b000SEvgeniy Ivanov 
3*58a2b000SEvgeniy Ivanov /*-
4*58a2b000SEvgeniy Ivanov  * Copyright (c) 1993
5*58a2b000SEvgeniy Ivanov  *	The Regents of the University of California.  All rights reserved.
6*58a2b000SEvgeniy Ivanov  *
7*58a2b000SEvgeniy Ivanov  * This code is derived from software contributed to Berkeley by
8*58a2b000SEvgeniy Ivanov  * The Mach Operating System project at Carnegie-Mellon University.
9*58a2b000SEvgeniy Ivanov  *
10*58a2b000SEvgeniy Ivanov  * Redistribution and use in source and binary forms, with or without
11*58a2b000SEvgeniy Ivanov  * modification, are permitted provided that the following conditions
12*58a2b000SEvgeniy Ivanov  * are met:
13*58a2b000SEvgeniy Ivanov  * 1. Redistributions of source code must retain the above copyright
14*58a2b000SEvgeniy Ivanov  *    notice, this list of conditions and the following disclaimer.
15*58a2b000SEvgeniy Ivanov  * 2. Redistributions in binary form must reproduce the above copyright
16*58a2b000SEvgeniy Ivanov  *    notice, this list of conditions and the following disclaimer in the
17*58a2b000SEvgeniy Ivanov  *    documentation and/or other materials provided with the distribution.
18*58a2b000SEvgeniy Ivanov  * 3. Neither the name of the University nor the names of its contributors
19*58a2b000SEvgeniy Ivanov  *    may be used to endorse or promote products derived from this software
20*58a2b000SEvgeniy Ivanov  *    without specific prior written permission.
21*58a2b000SEvgeniy Ivanov  *
22*58a2b000SEvgeniy Ivanov  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23*58a2b000SEvgeniy Ivanov  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24*58a2b000SEvgeniy Ivanov  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25*58a2b000SEvgeniy Ivanov  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26*58a2b000SEvgeniy Ivanov  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27*58a2b000SEvgeniy Ivanov  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28*58a2b000SEvgeniy Ivanov  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29*58a2b000SEvgeniy Ivanov  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30*58a2b000SEvgeniy Ivanov  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31*58a2b000SEvgeniy Ivanov  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32*58a2b000SEvgeniy Ivanov  * SUCH DAMAGE.
33*58a2b000SEvgeniy Ivanov  *
34*58a2b000SEvgeniy Ivanov  *	@(#)write.c	8.1 (Berkeley) 6/11/93
35*58a2b000SEvgeniy Ivanov  *
36*58a2b000SEvgeniy Ivanov  *
37*58a2b000SEvgeniy Ivanov  * Copyright (c) 1989, 1990, 1991 Carnegie Mellon University
38*58a2b000SEvgeniy Ivanov  * All Rights Reserved.
39*58a2b000SEvgeniy Ivanov  *
40*58a2b000SEvgeniy Ivanov  * Author: Alessandro Forin
41*58a2b000SEvgeniy Ivanov  *
42*58a2b000SEvgeniy Ivanov  * Permission to use, copy, modify and distribute this software and its
43*58a2b000SEvgeniy Ivanov  * documentation is hereby granted, provided that both the copyright
44*58a2b000SEvgeniy Ivanov  * notice and this permission notice appear in all copies of the
45*58a2b000SEvgeniy Ivanov  * software, derivative works or modified versions, and any portions
46*58a2b000SEvgeniy Ivanov  * thereof, and that both notices appear in supporting documentation.
47*58a2b000SEvgeniy Ivanov  *
48*58a2b000SEvgeniy Ivanov  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
49*58a2b000SEvgeniy Ivanov  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
50*58a2b000SEvgeniy Ivanov  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
51*58a2b000SEvgeniy Ivanov  *
52*58a2b000SEvgeniy Ivanov  * Carnegie Mellon requests users of this software to return to
53*58a2b000SEvgeniy Ivanov  *
54*58a2b000SEvgeniy Ivanov  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
55*58a2b000SEvgeniy Ivanov  *  School of Computer Science
56*58a2b000SEvgeniy Ivanov  *  Carnegie Mellon University
57*58a2b000SEvgeniy Ivanov  *  Pittsburgh PA 15213-3890
58*58a2b000SEvgeniy Ivanov  *
59*58a2b000SEvgeniy Ivanov  * any improvements or extensions that they make and grant Carnegie the
60*58a2b000SEvgeniy Ivanov  * rights to redistribute these changes.
61*58a2b000SEvgeniy Ivanov  */
62*58a2b000SEvgeniy Ivanov 
63*58a2b000SEvgeniy Ivanov #include <sys/param.h>
64*58a2b000SEvgeniy Ivanov #include "stand.h"
65*58a2b000SEvgeniy Ivanov 
66*58a2b000SEvgeniy Ivanov ssize_t
write(int fd,const void * destp,size_t bcount)67*58a2b000SEvgeniy Ivanov write(int fd, const void *destp, size_t bcount)
68*58a2b000SEvgeniy Ivanov {
69*58a2b000SEvgeniy Ivanov 	struct open_file *f = &files[fd];
70*58a2b000SEvgeniy Ivanov 	size_t resid;
71*58a2b000SEvgeniy Ivanov 	void *dest = __UNCONST(destp);
72*58a2b000SEvgeniy Ivanov 
73*58a2b000SEvgeniy Ivanov #if !defined(LIBSA_NO_FD_CHECKING)
74*58a2b000SEvgeniy Ivanov 	if ((unsigned int)fd >= SOPEN_MAX || !(f->f_flags & F_WRITE)) {
75*58a2b000SEvgeniy Ivanov 		errno = EBADF;
76*58a2b000SEvgeniy Ivanov 		return -1;
77*58a2b000SEvgeniy Ivanov 	}
78*58a2b000SEvgeniy Ivanov #endif
79*58a2b000SEvgeniy Ivanov #if !defined(LIBSA_NO_RAW_ACCESS)
80*58a2b000SEvgeniy Ivanov 	if (f->f_flags & F_RAW) {
81*58a2b000SEvgeniy Ivanov #if !defined(LIBSA_NO_TWIDDLE)
82*58a2b000SEvgeniy Ivanov 		twiddle();
83*58a2b000SEvgeniy Ivanov #endif
84*58a2b000SEvgeniy Ivanov 		errno = DEV_STRATEGY(f->f_dev)(f->f_devdata, F_WRITE,
85*58a2b000SEvgeniy Ivanov 			btodb(f->f_offset), bcount, dest, &resid);
86*58a2b000SEvgeniy Ivanov 		if (errno)
87*58a2b000SEvgeniy Ivanov 			return -1;
88*58a2b000SEvgeniy Ivanov 		f->f_offset += resid;
89*58a2b000SEvgeniy Ivanov 		return resid;
90*58a2b000SEvgeniy Ivanov 	}
91*58a2b000SEvgeniy Ivanov #endif
92*58a2b000SEvgeniy Ivanov 	resid = bcount;
93*58a2b000SEvgeniy Ivanov 	if ((errno = FS_WRITE(f->f_ops)(f, dest, bcount, &resid)))
94*58a2b000SEvgeniy Ivanov 		return -1;
95*58a2b000SEvgeniy Ivanov 	return 0;
96*58a2b000SEvgeniy Ivanov }
97