/* $OpenBSD: open.c,v 1.2 2016/03/14 23:08:05 krw Exp $ */ /* $NetBSD: open.c,v 1.12 1996/09/30 16:01:21 ws 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. * 3. 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 struct open_file files[SOPEN_MAX]; /* * File primitives proper */ int #ifndef __INTERNAL_LIBSA_CREAD open(const char *fname, int mode) #else oopen(const char *fname, int mode) #endif { struct open_file *f; int fd, i, error; char *file; /* find a free file descriptor */ for (fd = 0, f = files; fd < SOPEN_MAX; fd++, f++) if (f->f_flags == 0) goto fnd; errno = EMFILE; return -1; fnd: /* * Try to open the device. * Convert open mode (0,1,2) to F_READ, F_WRITE. */ f->f_flags = mode + 1; f->f_dev = NULL; f->f_ops = NULL; file = NULL; error = devopen(f, fname, &file); if (error || (((f->f_flags & F_NODEV) == 0) && f->f_dev == NULL)) goto err; /* see if we opened a raw device; otherwise, 'file' is the file name. */ if (file == NULL || *file == '\0') { f->f_flags |= F_RAW; return fd; } /* Allow f->f_ops to be set by devopen routine. */ if (f->f_ops != NULL) { error = f->f_ops->open(file, f); if (error == 0) return fd; } else { /* pass file name to the different filesystem open routines */ for (i = 0; i < nfsys; i++) { /* convert mode (0,1,2) to FREAD, FWRITE. */ error = (file_system[i].open)(file, f); if (error == 0) { f->f_ops = &file_system[i]; return (fd); } if (error == ENOENT || error == ENOTDIR) break; } } if (error == 0) error = ENOENT; f->f_dev->dv_close(f); err: f->f_flags = 0; errno = error; return -1; }