diff options
Diffstat (limited to 'stand/libsa/open.c')
| -rw-r--r-- | stand/libsa/open.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/stand/libsa/open.c b/stand/libsa/open.c new file mode 100644 index 000000000000..2ae17314bc54 --- /dev/null +++ b/stand/libsa/open.c @@ -0,0 +1,159 @@ +/* $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. + * 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 <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include "stand.h" + +struct fs_ops *exclusive_file_system; + +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 fs_ops *fs; + 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; + + if (exclusive_file_system != NULL) { + fs = exclusive_file_system; + error = (fs->fo_open)(fname, f); + if (error == 0) + goto ok; + goto err; + } + + 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++) { + fs = file_system[i]; + error = (fs->fo_open)(file, f); + if (error == 0) + goto ok; + if (error != EINVAL) + besterror = error; + } + error = besterror; + + fail: + if ((f->f_flags & F_NODEV) == 0 && f->f_dev != NULL) + f->f_dev->dv_close(f); + if (error) + devclose(f); + + err: + f->f_flags = 0; + errno = error; + return (-1); + + ok: + f->f_ops = fs; + o_rainit(f); + return (fd); +} |