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Commit	Line	Data
	1	/* $NetBSD: write.c,v 1.7 1996/06/21 20:29:30 pk Exp $ */
	2	/* $DragonFly: src/lib/libstand/write.c,v 1.3 2005/12/11 02:27:26 swildner 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. All advertising materials mentioning features or use of this software
	20	* must display the following acknowledgement:
	21	* This product includes software developed by the University of
	22	* California, Berkeley and its contributors.
	23	* 4. Neither the name of the University nor the names of its contributors
	24	* may be used to endorse or promote products derived from this software
	25	* without specific prior written permission.
	26	*
	27	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	28	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	29	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	30	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	31	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	32	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	33	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	34	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	35	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	36	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	37	* SUCH DAMAGE.
	38	*
	39	* @(#)write.c 8.1 (Berkeley) 6/11/93
	40	*
	41	*
	42	* Copyright (c) 1989, 1990, 1991 Carnegie Mellon University
	43	* All Rights Reserved.
	44	*
	45	* Author: Alessandro Forin
	46	*
	47	* Permission to use, copy, modify and distribute this software and its
	48	* documentation is hereby granted, provided that both the copyright
	49	* notice and this permission notice appear in all copies of the
	50	* software, derivative works or modified versions, and any portions
	51	* thereof, and that both notices appear in supporting documentation.
	52	*
	53	* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
	54	* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
	55	* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
	56	*
	57	* Carnegie Mellon requests users of this software to return to
	58	*
	59	* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
	60	* School of Computer Science
	61	* Carnegie Mellon University
	62	* Pittsburgh PA 15213-3890
	63	*
	64	* any improvements or extensions that they make and grant Carnegie the
	65	* rights to redistribute these changes.
	66	*/
	67
	68	#include <sys/param.h>
	69	#include "stand.h"
	70
	71	ssize_t
	72	write(int fd, void *dest, size_t bcount)
	73	{
	74	struct open_file *f = &files[fd];
	75	size_t resid;
	76
	77	if ((unsigned)fd >= SOPEN_MAX \|\| !(f->f_flags & F_WRITE)) {
	78	errno = EBADF;
	79	return (-1);
	80	}
	81	if (f->f_flags & F_RAW) {
	82	twiddle();
	83	errno = (f->f_dev->dv_strategy)(f->f_devdata, F_WRITE,
	84	btodb(f->f_offset), bcount, dest, &resid);
	85	if (errno)
	86	return (-1);
	87	f->f_offset += resid;
	88	return (resid);
	89	}
	90	resid = bcount;
	91	if ((errno = (f->f_ops->fo_write)(f, dest, bcount, &resid)))
	92	return (-1);
	93	return (0);
	94	}