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Annotation of sys/lib/libsa/write.c, Revision 1.1.1.1

1.1       nbrk        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: }