1 /* $NetBSD: close.c,v 1.7 1997/01/22 00:38:09 cgd Exp $ */
2
3 /*-
4 * Copyright (c) 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * The Mach Operating System project at Carnegie-Mellon University.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 *
35 * Copyright (c) 1989, 1990, 1991 Carnegie Mellon University
36 * All Rights Reserved.
37 *
38 * Author: Alessandro Forin
39 *
40 * Permission to use, copy, modify and distribute this software and its
41 * documentation is hereby granted, provided that both the copyright
42 * notice and this permission notice appear in all copies of the
43 * software, derivative works or modified versions, and any portions
44 * thereof, and that both notices appear in supporting documentation.
45 *
46 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
47 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
48 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
49 *
50 * Carnegie Mellon requests users of this software to return to
51 *
52 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
53 * School of Computer Science
54 * Carnegie Mellon University
55 * Pittsburgh PA 15213-3890
56 *
57 * any improvements or extensions that they make and grant Carnegie the
58 * rights to redistribute these changes.
59 */
60
61 #include "stand.h"
62
63 int
close(int fd)64 close(int fd)
65 {
66 struct open_file *f, *last;
67 int err1 = 0, err2 = 0;
68
69 f = fd2open_file(fd);
70 if (f == NULL) {
71 errno = EBADF;
72 return (-1);
73 }
74 free(f->f_rabuf);
75 f->f_rabuf = NULL;
76
77 if (f->f_flags != 0) {
78 if (!(f->f_flags & F_RAW) && f->f_ops)
79 err1 = (f->f_ops->fo_close)(f);
80 if (!(f->f_flags & F_NODEV) && f->f_dev)
81 err2 = (f->f_dev->dv_close)(f);
82 if (f->f_devdata != NULL)
83 devclose(f);
84 f->f_flags = 0;
85 } else {
86 /* Attempt to close already closed file. */
87 err1 = EBADF;
88 }
89
90 /* free unused entries from tail. */
91 TAILQ_FOREACH_REVERSE_SAFE(last, &files, file_list, f_link, f) {
92 if (last->f_flags != 0)
93 break;
94 TAILQ_REMOVE(&files, last, f_link);
95 free(last);
96 }
97
98 if (err1) {
99 errno = err1;
100 return (-1);
101 }
102 if (err2) {
103 errno = err2;
104 return (-1);
105 }
106 return (0);
107 }
108