1 /****************************************************************************
2 * fs/vfs/fs_ioctl.c
3 *
4 * Licensed to the Apache Software Foundation (ASF) under one or more
5 * contributor license agreements. See the NOTICE file distributed with
6 * this work for additional information regarding copyright ownership. The
7 * ASF licenses this file to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance with the
9 * License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
16 * License for the specific language governing permissions and limitations
17 * under the License.
18 *
19 ****************************************************************************/
20
21 /****************************************************************************
22 * Included Files
23 ****************************************************************************/
24
25 #include "vfs_config.h"
26 #include "sched.h"
27 #include "assert.h"
28 #include "errno.h"
29 #include "unistd.h"
30 #include "console.h"
31
32 #if defined(LOSCFG_NET_LWIP_SACK)
33 #include "lwip/sockets.h"
34 #endif
35
36 #include "vnode.h"
37
38 /****************************************************************************
39 * Public Functions
40 ****************************************************************************/
41
42 /****************************************************************************
43 * Name: ioctl/fs_ioctl
44 *
45 * Description:
46 * Perform device specific operations.
47 *
48 * Input Parameters:
49 * fd File/socket descriptor of device
50 * req The ioctl command
51 * arg The argument of the ioctl cmd
52 *
53 * Returned Value:
54 * >=0 on success (positive non-zero values are cmd-specific)
55 * -1 on failure with errno set properly:
56 *
57 * EBADF
58 * 'fd' is not a valid descriptor.
59 * EFAULT
60 * 'arg' references an inaccessible memory area.
61 * EINVAL
62 * 'cmd' or 'arg' is not valid.
63 * ENOTTY
64 * 'fd' is not associated with a character special device.
65 * ENOTTY
66 * The specified request does not apply to the kind of object that the
67 * descriptor 'fd' references.
68 *
69 ****************************************************************************/
70
71 #ifdef CONFIG_LIBC_IOCTL_VARIADIC
fs_ioctl(int fd,int req,...)72 int fs_ioctl(int fd, int req, ...)
73 #else
74 int ioctl(int fd, int req, ...)
75 #endif
76 {
77 int err;
78 UINTPTR arg = 0;
79 va_list ap;
80 #if CONFIG_NFILE_DESCRIPTORS > 0
81 struct file *filep;
82 int ret = OK;
83 #endif
84
85 va_start(ap, req);
86 arg = va_arg(ap, UINTPTR);
87 va_end(ap);
88 #if CONFIG_NFILE_DESCRIPTORS > 0
89
90 /* Did we get a valid file descriptor? */
91
92 if ((unsigned int)fd >= CONFIG_NFILE_DESCRIPTORS)
93 #endif
94 {
95 /* Perform the socket ioctl */
96
97 #if defined(LOSCFG_NET_LWIP_SACK)
98 if ((unsigned int)fd < (unsigned int)(CONFIG_NFILE_DESCRIPTORS+CONFIG_NSOCKET_DESCRIPTORS))
99 {
100 return socks_ioctl(fd, (long)req, (void *)arg);
101 }
102 else
103 #endif
104 {
105 err = EBADF;
106 ret = VFS_ERROR;
107 goto errout;
108 }
109 }
110
111 #if CONFIG_NFILE_DESCRIPTORS > 0
112
113 if (fd >= STDIN_FILENO && fd <= STDERR_FILENO) /* fd : [0,2] */
114 {
115 fd = ConsoleUpdateFd();
116 if (fd < 0)
117 {
118 err = EBADF;
119 ret = VFS_ERROR;
120 goto errout;
121 }
122 }
123
124 /* Get the file structure corresponding to the file descriptor. */
125
126 ret = fs_getfilep(fd, &filep);
127 if (ret < 0)
128 {
129 /* The errno value has already been set */
130 return VFS_ERROR;
131 }
132
133 /* Is a driver registered? Does it support the ioctl method? */
134
135 if (filep->ops && filep->ops->ioctl)
136 {
137 /* Yes, then let it perform the ioctl */
138
139 ret = (int) filep->ops->ioctl(filep, req, arg);
140 if (ret < 0)
141 {
142 err = -ret;
143 goto errout;
144 }
145 }
146 else
147 {
148 err = ENOSYS;
149 ret = VFS_ERROR;
150 goto errout;
151 }
152
153 return ret;
154 #endif
155
156 errout:
157 set_errno(err);
158 return VFS_ERROR;
159 }
160