diff options
Diffstat (limited to 'sys/lib/libsa/open.c')
| -rw-r--r-- | sys/lib/libsa/open.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/sys/lib/libsa/open.c b/sys/lib/libsa/open.c new file mode 100644 index 00000000000..982f4eaf10e --- /dev/null +++ b/sys/lib/libsa/open.c @@ -0,0 +1,164 @@ +/* $NetBSD: open.c,v 1.9 1995/09/19 09:16:52 thorpej 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 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 "stand.h" +struct open_file files[SOPEN_MAX]; + +/* + * File primitives proper + */ + +int +open(fname, mode) + const char *fname; + int mode; +{ + register struct open_file *f; + register 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 = (struct devsw *)0; + f->f_ops = (struct fs_ops *)0; + 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; + return (0); + } + + /* 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) + error = ENOENT; + +err: + f->f_flags = 0; + errno = error; + return (-1); +} + +/* + * Null filesystem + */ +int null_open (char *path, struct open_file *f) +{ + errno = EIO; + return -1; +} + +int null_close(struct open_file *f) +{ + return 0; +} + +ssize_t null_read (struct open_file *f, void *buf, size_t size, size_t *resid) +{ + errno = EIO; + return -1; +} + +ssize_t null_write (struct open_file *f, void *buf, size_t size, size_t *resid) +{ + errno = EIO; + return -1; +} + +off_t null_seek (struct open_file *f, off_t offset, int where) +{ + errno = EIO; + return -1; +} + +int null_stat (struct open_file *f, struct stat *sb) +{ + errno = EIO; + return -1; +} + |