Annotation of sys/lib/libsa/open.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: open.c,v 1.10 2003/08/11 06:23:09 deraadt Exp $ */
2: /* $NetBSD: open.c,v 1.12 1996/09/30 16:01:21 ws Exp $ */
3:
4: /*-
5: * Copyright (c) 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * The Mach Operating System project at Carnegie-Mellon University.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
19: * 3. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: *
35: * @(#)open.c 8.1 (Berkeley) 6/11/93
36: *
37: *
38: * Copyright (c) 1989, 1990, 1991 Carnegie Mellon University
39: * All Rights Reserved.
40: *
41: * Author: Alessandro Forin
42: *
43: * Permission to use, copy, modify and distribute this software and its
44: * documentation is hereby granted, provided that both the copyright
45: * notice and this permission notice appear in all copies of the
46: * software, derivative works or modified versions, and any portions
47: * thereof, and that both notices appear in supporting documentation.
48: *
49: * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
50: * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
51: * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
52: *
53: * Carnegie Mellon requests users of this software to return to
54: *
55: * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
56: * School of Computer Science
57: * Carnegie Mellon University
58: * Pittsburgh PA 15213-3890
59: *
60: * any improvements or extensions that they make and grant Carnegie the
61: * rights to redistribute these changes.
62: */
63:
64: #include "stand.h"
65:
66: struct open_file files[SOPEN_MAX];
67:
68: /*
69: * File primitives proper
70: */
71:
72: int
73: #ifndef __INTERNAL_LIBSA_CREAD
74: open(const char *fname, int mode)
75: #else
76: oopen(const char *fname, int mode)
77: #endif
78: {
79: struct open_file *f;
80: int fd, i, error;
81: char *file;
82:
83: /* find a free file descriptor */
84: for (fd = 0, f = files; fd < SOPEN_MAX; fd++, f++)
85: if (f->f_flags == 0)
86: goto fnd;
87: errno = EMFILE;
88: return (-1);
89: fnd:
90: /*
91: * Try to open the device.
92: * Convert open mode (0,1,2) to F_READ, F_WRITE.
93: */
94: f->f_flags = mode + 1;
95: f->f_dev = (struct devsw *)0;
96: f->f_ops = (struct fs_ops *)0;
97: file = (char *)0;
98: error = devopen(f, fname, &file);
99: if (error ||
100: (((f->f_flags & F_NODEV) == 0) && f->f_dev == (struct devsw *)0))
101: goto err;
102:
103: /* see if we opened a raw device; otherwise, 'file' is the file name. */
104: if (file == (char *)0 || *file == '\0') {
105: f->f_flags |= F_RAW;
106: return (fd);
107: }
108:
109: /* pass file name to the different filesystem open routines */
110: for (i = 0; i < nfsys; i++) {
111: /* convert mode (0,1,2) to FREAD, FWRITE. */
112: error = (file_system[i].open)(file, f);
113: if (error == 0) {
114: f->f_ops = &file_system[i];
115: return (fd);
116: }
117: if (error == ENOENT || error == ENOTDIR)
118: break;
119: }
120: if (!error)
121: error = ENOENT;
122:
123: f->f_dev->dv_close(f);
124: err:
125: f->f_flags = 0;
126: errno = error;
127: return (-1);
128: }
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