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

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: }