FreeBSD/Linux Kernel Cross Reference
sys/lib/libsa/write.c

     /*      $NetBSD: write.c,v 1.10 2003/08/07 16:32:31 agc Exp $   */
     
     /*-
      * Copyright (c) 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * The Mach Operating System project at Carnegie-Mellon University.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)write.c     8.1 (Berkeley) 6/11/93
     *  
     *
     * Copyright (c) 1989, 1990, 1991 Carnegie Mellon University
     * All Rights Reserved.
     *
     * Author: Alessandro Forin
     * 
     * Permission to use, copy, modify and distribute this software and its
     * documentation is hereby granted, provided that both the copyright
     * notice and this permission notice appear in all copies of the
     * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     * 
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     * 
     * Carnegie Mellon requests users of this software to return to
     * 
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     * 
     * any improvements or extensions that they make and grant Carnegie the
     * rights to redistribute these changes.
     */
    
    #include <sys/param.h>
    #include "stand.h"
    
    ssize_t
    write(fd, dest, bcount)
            int fd;
            void *dest;
            size_t bcount;
    {
            struct open_file *f = &files[fd];
            size_t resid;
    
    #if !defined(LIBSA_NO_FD_CHECKING)
            if ((unsigned)fd >= SOPEN_MAX || !(f->f_flags & F_WRITE)) {
                    errno = EBADF;
                    return (-1);
            }
    #endif
    #if !defined(LIBSA_NO_RAW_ACCESS)
            if (f->f_flags & F_RAW) {
    #if !defined(LIBSA_NO_TWIDDLE)
                    twiddle();
    #endif
                    errno = DEV_STRATEGY(f->f_dev)(f->f_devdata, F_WRITE,
                            btodb(f->f_offset), bcount, dest, &resid);
                    if (errno)
                            return (-1);
                    f->f_offset += resid;
                    return (resid);
            }
    #endif
            resid = bcount;
            if ((errno = FS_WRITE(f->f_ops)(f, dest, bcount, &resid)))
                    return (-1);
            return (0);
    }

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