1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright 2015, Joyent Inc.
25 * Copyright 2017 Nexenta Systems, Inc. All rights reserved.
26 * Copyright 2024 RackTop Systems, Inc.
27 */
28
29 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
30 /* All Rights Reserved */
31
32 /*
33 * The kTLI "shim" in fake_ktli.c uses file_getf(), file_releasef() to
34 * get a file_t pointer, and uses the (private) file_getfd() to access
35 * the socket file descriptor behind that file_t (which is actually a
36 * fake_file_t created here). These correspond to getf/releasef that
37 * are normally found in os/fio.c but renamed to avoid accidental use.
38 */
39
40 #include <sys/types.h>
41 #include <sys/sysmacros.h>
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/errno.h>
45 #include <sys/cred.h>
46 #include <sys/user.h>
47 #include <sys/vfs.h>
48 #include <sys/vnode.h>
49 #include <sys/file.h>
50 #include <sys/debug.h>
51 #include <sys/kmem.h>
52
53 #include "fake_fio.h"
54
55 typedef struct fake_file {
56 struct file ff_file;
57 int ff_fd;
58 } fake_file_t;
59
60 #define FAKEFDS 256
61
62 kmutex_t ftlock;
63 fake_file_t *ftab[FAKEFDS];
64
65 file_t *
file_getf(int fd)66 file_getf(int fd)
67 {
68 fake_file_t *fp;
69
70 if (fd < 0 || fd >= FAKEFDS)
71 return (NULL);
72
73 mutex_enter(&ftlock);
74 if ((fp = ftab[fd]) != NULL) {
75 fp->ff_file.f_count++;
76 mutex_exit(&ftlock);
77 return (&fp->ff_file);
78 }
79
80 fp = kmem_zalloc(sizeof (*fp), KM_SLEEP);
81 fp->ff_fd = fd;
82 fp->ff_file.f_count = 1;
83
84 ftab[fd] = fp;
85 mutex_exit(&ftlock);
86
87 return (&fp->ff_file);
88 }
89
90 void
file_releasef(int fd)91 file_releasef(int fd)
92 {
93 fake_file_t *fp;
94
95 mutex_enter(&ftlock);
96 if ((fp = ftab[fd]) == NULL) {
97 mutex_exit(&ftlock);
98 return;
99 }
100 fp->ff_file.f_count--;
101 if (fp->ff_file.f_count > 0) {
102 mutex_exit(&ftlock);
103 return;
104 }
105 ftab[fd] = NULL;
106 mutex_exit(&ftlock);
107
108 kmem_free(fp, sizeof (*fp));
109 }
110
111 int
file_getfd(file_t * fp)112 file_getfd(file_t *fp)
113 {
114 fake_file_t *ffp = (fake_file_t *)fp;
115 int fd = ffp->ff_fd;
116
117 VERIFY(fd >= 0 && fd < FAKEFDS);
118 ASSERT(ffp == ftab[fd]);
119
120 return (fd);
121 }
122