/* $NetBSD: open.c,v 1.16 1997/01/28 09:41:03 pk 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. * 4. 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. * * @(#)open.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/cdefs.h> __FBSDID("$FreeBSD$"); #include "stand.h" struct open_file files[SOPEN_MAX]; static int o_gethandle(void) { int fd; for (fd = 0; fd < SOPEN_MAX; fd++) if (files[fd].f_flags == 0) return(fd); return(-1); } static void o_rainit(struct open_file *f) { f->f_rabuf = malloc(SOPEN_RASIZE); f->f_ralen = 0; f->f_raoffset = 0; } int open(const char *fname, int mode) { struct open_file *f; int fd, i, error, besterror; const char *file; if ((fd = o_gethandle()) == -1) { errno = EMFILE; return(-1); } f = &files[fd]; f->f_flags = mode + 1; f->f_dev = (struct devsw *)0; f->f_ops = (struct fs_ops *)0; f->f_offset = 0; f->f_devdata = NULL; file = (char *)0; error = devopen(f, fname, &file); if (error || (((f->f_flags & F_NODEV) == 0) && f->f_dev == (struct devsw *)0)) goto err; /* see if we opened a raw device; otherwise, 'file' is the file name. */ if (file == (char *)0 || *file == '\0') { f->f_flags |= F_RAW; f->f_rabuf = NULL; return (fd); } /* pass file name to the different filesystem open routines */ besterror = ENOENT; for (i = 0; file_system[i] != NULL; i++) { error = ((*file_system[i]).fo_open)(file, f); if (error == 0) { f->f_ops = file_system[i]; o_rainit(f); return (fd); } if (error != EINVAL) besterror = error; } error = besterror; if ((f->f_flags & F_NODEV) == 0) f->f_dev->dv_close(f); if (error) devclose(f); err: f->f_flags = 0; errno = error; return (-1); }