Return to write.c CVS log

Up to [local] / sys / lib / libsa

Annotation of sys/lib/libsa/write.c, Revision 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: }