138451Smsmith/* $NetBSD: open.c,v 1.16 1997/01/28 09:41:03 pk Exp $ */ 238451Smsmith 338451Smsmith/*- 438451Smsmith * Copyright (c) 1993 538451Smsmith * The Regents of the University of California. All rights reserved. 638451Smsmith * 738451Smsmith * This code is derived from software contributed to Berkeley by 838451Smsmith * The Mach Operating System project at Carnegie-Mellon University. 938451Smsmith * 1038451Smsmith * Redistribution and use in source and binary forms, with or without 1138451Smsmith * modification, are permitted provided that the following conditions 1238451Smsmith * are met: 1338451Smsmith * 1. Redistributions of source code must retain the above copyright 1438451Smsmith * notice, this list of conditions and the following disclaimer. 1538451Smsmith * 2. Redistributions in binary form must reproduce the above copyright 1638451Smsmith * notice, this list of conditions and the following disclaimer in the 1738451Smsmith * documentation and/or other materials provided with the distribution. 1838451Smsmith * 4. Neither the name of the University nor the names of its contributors 1938451Smsmith * may be used to endorse or promote products derived from this software 2038451Smsmith * without specific prior written permission. 2138451Smsmith * 2238451Smsmith * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2338451Smsmith * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2438451Smsmith * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2538451Smsmith * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2638451Smsmith * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2738451Smsmith * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2838451Smsmith * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2938451Smsmith * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3038451Smsmith * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3138451Smsmith * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3238451Smsmith * SUCH DAMAGE. 3338451Smsmith * 3438451Smsmith * @(#)open.c 8.1 (Berkeley) 6/11/93 3538451Smsmith * 3638451Smsmith * 3738451Smsmith * Copyright (c) 1989, 1990, 1991 Carnegie Mellon University 3838451Smsmith * All Rights Reserved. 3938451Smsmith * 4038451Smsmith * Author: Alessandro Forin 4138451Smsmith * 4238451Smsmith * Permission to use, copy, modify and distribute this software and its 4338451Smsmith * documentation is hereby granted, provided that both the copyright 4438451Smsmith * notice and this permission notice appear in all copies of the 4538451Smsmith * software, derivative works or modified versions, and any portions 4638451Smsmith * thereof, and that both notices appear in supporting documentation. 4738451Smsmith * 4838451Smsmith * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 4938451Smsmith * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 5038451Smsmith * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 5138451Smsmith * 5238451Smsmith * Carnegie Mellon requests users of this software to return to 5338451Smsmith * 5438451Smsmith * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 5538451Smsmith * School of Computer Science 5638451Smsmith * Carnegie Mellon University 5738451Smsmith * Pittsburgh PA 15213-3890 5838451Smsmith * 5938451Smsmith * any improvements or extensions that they make and grant Carnegie the 6038451Smsmith * rights to redistribute these changes. 6138451Smsmith */ 6238451Smsmith 6384221Sdillon#include <sys/cdefs.h> 6484221Sdillon__FBSDID("$FreeBSD$"); 6584221Sdillon 6638451Smsmith#include "stand.h" 6738451Smsmith 6838451Smsmithstruct open_file files[SOPEN_MAX]; 6938451Smsmith 7038451Smsmithstatic int 7138451Smsmitho_gethandle(void) 7238451Smsmith{ 7338451Smsmith int fd; 7438451Smsmith 7538451Smsmith for (fd = 0; fd < SOPEN_MAX; fd++) 7638451Smsmith if (files[fd].f_flags == 0) 7738451Smsmith return(fd); 7838451Smsmith return(-1); 7938451Smsmith} 8038451Smsmith 8165470Smsmithstatic void 8265470Smsmitho_rainit(struct open_file *f) 8365470Smsmith{ 8465470Smsmith f->f_rabuf = malloc(SOPEN_RASIZE); 8565470Smsmith f->f_ralen = 0; 8665470Smsmith f->f_raoffset = 0; 8765470Smsmith} 8838451Smsmith 8938451Smsmithint 9038451Smsmithopen(const char *fname, int mode) 9138451Smsmith{ 9238451Smsmith struct open_file *f; 9338451Smsmith int fd, i, error, besterror; 9439672Sdfr const char *file; 9538451Smsmith 9638451Smsmith if ((fd = o_gethandle()) == -1) { 9738451Smsmith errno = EMFILE; 9838451Smsmith return(-1); 9938451Smsmith } 10038451Smsmith 10138451Smsmith f = &files[fd]; 10238451Smsmith f->f_flags = mode + 1; 10338451Smsmith f->f_dev = (struct devsw *)0; 10438451Smsmith f->f_ops = (struct fs_ops *)0; 10538451Smsmith f->f_offset = 0; 10638451Smsmith f->f_devdata = NULL; 10738451Smsmith file = (char *)0; 10838451Smsmith error = devopen(f, fname, &file); 10938451Smsmith if (error || 11038451Smsmith (((f->f_flags & F_NODEV) == 0) && f->f_dev == (struct devsw *)0)) 11138451Smsmith goto err; 11238451Smsmith 11338451Smsmith /* see if we opened a raw device; otherwise, 'file' is the file name. */ 11438451Smsmith if (file == (char *)0 || *file == '\0') { 11538451Smsmith f->f_flags |= F_RAW; 116198542Sbrueffer f->f_rabuf = NULL; 11738451Smsmith return (fd); 11838451Smsmith } 11938451Smsmith 12038451Smsmith /* pass file name to the different filesystem open routines */ 12138451Smsmith besterror = ENOENT; 12238451Smsmith for (i = 0; file_system[i] != NULL; i++) { 12338451Smsmith 12438451Smsmith error = ((*file_system[i]).fo_open)(file, f); 12538451Smsmith if (error == 0) { 12638451Smsmith 12738451Smsmith f->f_ops = file_system[i]; 12865470Smsmith o_rainit(f); 12938451Smsmith return (fd); 13038451Smsmith } 13138451Smsmith if (error != EINVAL) 13238451Smsmith besterror = error; 13338451Smsmith } 13438451Smsmith error = besterror; 13538451Smsmith 13638451Smsmith if ((f->f_flags & F_NODEV) == 0) 13738451Smsmith f->f_dev->dv_close(f); 13838451Smsmith if (error) 13938451Smsmith devclose(f); 14038451Smsmith 14138451Smsmith err: 14238451Smsmith f->f_flags = 0; 14338451Smsmith errno = error; 14438451Smsmith return (-1); 14538451Smsmith} 146