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Annotation of sys/lib/libsa/open.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: open.c,v 1.10 2003/08/11 06:23:09 deraadt Exp $       */
        !             2: /*     $NetBSD: open.c,v 1.12 1996/09/30 16:01:21 ws 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:  *     @(#)open.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 "stand.h"
        !            65:
        !            66: struct open_file files[SOPEN_MAX];
        !            67:
        !            68: /*
        !            69:  *     File primitives proper
        !            70:  */
        !            71:
        !            72: int
        !            73: #ifndef __INTERNAL_LIBSA_CREAD
        !            74: open(const char *fname, int mode)
        !            75: #else
        !            76: oopen(const char *fname, int mode)
        !            77: #endif
        !            78: {
        !            79:        struct open_file *f;
        !            80:        int fd, i, error;
        !            81:        char *file;
        !            82:
        !            83:        /* find a free file descriptor */
        !            84:        for (fd = 0, f = files; fd < SOPEN_MAX; fd++, f++)
        !            85:                if (f->f_flags == 0)
        !            86:                        goto fnd;
        !            87:        errno = EMFILE;
        !            88:        return (-1);
        !            89: fnd:
        !            90:        /*
        !            91:         * Try to open the device.
        !            92:         * Convert open mode (0,1,2) to F_READ, F_WRITE.
        !            93:         */
        !            94:        f->f_flags = mode + 1;
        !            95:        f->f_dev = (struct devsw *)0;
        !            96:        f->f_ops = (struct fs_ops *)0;
        !            97:        file = (char *)0;
        !            98:        error = devopen(f, fname, &file);
        !            99:        if (error ||
        !           100:            (((f->f_flags & F_NODEV) == 0) && f->f_dev == (struct devsw *)0))
        !           101:                goto err;
        !           102:
        !           103:        /* see if we opened a raw device; otherwise, 'file' is the file name. */
        !           104:        if (file == (char *)0 || *file == '\0') {
        !           105:                f->f_flags |= F_RAW;
        !           106:                return (fd);
        !           107:        }
        !           108:
        !           109:        /* pass file name to the different filesystem open routines */
        !           110:        for (i = 0; i < nfsys; i++) {
        !           111:                /* convert mode (0,1,2) to FREAD, FWRITE. */
        !           112:                error = (file_system[i].open)(file, f);
        !           113:                if (error == 0) {
        !           114:                        f->f_ops = &file_system[i];
        !           115:                        return (fd);
        !           116:                }
        !           117:                if (error == ENOENT || error == ENOTDIR)
        !           118:                        break;
        !           119:        }
        !           120:        if (!error)
        !           121:                error = ENOENT;
        !           122:
        !           123:        f->f_dev->dv_close(f);
        !           124: err:
        !           125:        f->f_flags = 0;
        !           126:        errno = error;
        !           127:        return (-1);
        !           128: }