128 lines
4.3 KiB
C
128 lines
4.3 KiB
C
/*-
|
|
* 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.
|
|
*
|
|
* From: @(#)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.
|
|
*
|
|
* $Id: open.c,v 1.1 1994/01/26 02:03:52 brezak Exp $
|
|
*/
|
|
|
|
#include "stand.h"
|
|
#include "ufs.h"
|
|
|
|
/*
|
|
* File primitives proper
|
|
*/
|
|
|
|
struct fs_ops file_system[] = {
|
|
{ ufs_open, ufs_close, ufs_read, ufs_write, ufs_seek, ufs_stat }
|
|
};
|
|
#define NFSYS (sizeof(file_system) / sizeof(struct fs_ops))
|
|
|
|
struct open_file files[SOPEN_MAX];
|
|
|
|
open(fname, mode)
|
|
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;
|
|
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;
|
|
file = (char *)0;
|
|
error = devopen(f, fname, &file);
|
|
if (error || 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) {
|
|
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:
|
|
errno = error;
|
|
return (-1);
|
|
}
|