1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
/****************************************************************************
* net/net_vfcntl.c
*
* Copyright (C) 2009, 2012-2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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. Neither the name NuttX 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 COPYRIGHT HOLDERS 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
* COPYRIGHT OWNER 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/socket.h>
#include <stdint.h>
#include <stdarg.h>
#include <fcntl.h>
#include <errno.h>
#include <arch/irq.h>
#include <nuttx/net/net.h>
#include "net.h"
#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/****************************************************************************
* Global Functions
****************************************************************************/
int net_vfcntl(int sockfd, int cmd, va_list ap)
{
FAR struct socket *psock = sockfd_socket(sockfd);
uip_lock_t flags;
int err = 0;
int ret = 0;
/* Verify that the sockfd corresponds to valid, allocated socket */
if (!psock || psock->s_crefs <= 0)
{
err = EBADF;
goto errout;
}
/* Interrupts must be disabled in order to perform operations on socket structures */
flags = uip_lock();
switch (cmd)
{
case F_DUPFD:
/* Return a new file descriptor which shall be the lowest numbered
* available (that is, not already open) file descriptor greater than
* or equal to the third argument, arg, taken as an integer of type
* int. The new file descriptor shall refer to the same open file
* description as the original file descriptor, and shall share any
* locks. The FD_CLOEXEC flag associated with the new file descriptor
* shall be cleared to keep the file open across calls to one of the
* exec functions.
*/
{
ret = net_dup(sockfd, va_arg(ap, int));
}
break;
case F_GETFD:
/* Get the file descriptor flags defined in <fcntl.h> that are associated
* with the file descriptor fd. File descriptor flags are associated
* with a single file descriptor and do not affect other file descriptors
* that refer to the same file.
*/
case F_SETFD:
/* Set the file descriptor flags defined in <fcntl.h>, that are associated
* with fd, to the third argument, arg, taken as type int. If the
* FD_CLOEXEC flag in the third argument is 0, the file shall remain open
* across the exec functions; otherwise, the file shall be closed upon
* successful execution of one of the exec functions.
*/
err = ENOSYS; /* F_GETFD and F_SETFD not implemented */
break;
case F_GETFL:
/* Get the file status flags and file access modes, defined in <fcntl.h>,
* for the file description associated with fd. The file access modes
* can be extracted from the return value using the mask O_ACCMODE, which is
* defined in <fcntl.h>. File status flags and file access modes are associated
* with the file description and do not affect other file descriptors that
* refer to the same file with different open file descriptions.
*/
{
/* This summarizes the behavior of the NuttX/uIP sockets */
ret = O_RDWR | O_SYNC | O_RSYNC;
#ifdef CONFIG_NET_TCP_READAHEAD
/* TCP/IP sockets may also be non-blocking if read-ahead is enabled */
if (psock->s_type == SOCK_STREAM && _SS_ISNONBLOCK(psock->s_flags))
{
ret |= O_NONBLOCK;
}
#endif
}
break;
case F_SETFL:
/* Set the file status flags, defined in <fcntl.h>, for the file description
* associated with fd from the corresponding bits in the third argument,
* arg, taken as type int. Bits corresponding to the file access mode and
* the file creation flags, as defined in <fcntl.h>, that are set in arg shall
* be ignored. If any bits in arg other than those mentioned here are changed
* by the application, the result is unspecified.
*/
{
#ifdef CONFIG_NET_TCP_READAHEAD
/* Non-blocking is the only configurable option. And it applies only to
* read operations on TCP/IP sockets when read-ahead is enabled.
*/
int mode = va_arg(ap, int);
if (psock->s_type == SOCK_STREAM)
{
if ((mode & O_NONBLOCK) != 0)
{
psock->s_flags |= _SF_NONBLOCK;
}
else
{
psock->s_flags &= ~_SF_NONBLOCK;
}
}
#endif
}
break;
case F_GETOWN:
/* If fd refers to a socket, get the process or process group ID specified
* to receive SIGURG signals when out-of-band data is available. Positive values
* indicate a process ID; negative values, other than -1, indicate a process group
* ID. If fd does not refer to a socket, the results are unspecified.
*/
case F_SETOWN:
/* If fd refers to a socket, set the process or process group ID specified
* to receive SIGURG signals when out-of-band data is available, using the value
* of the third argument, arg, taken as type int. Positive values indicate a
* process ID; negative values, other than -1, indicate a process group ID. If
* fd does not refer to a socket, the results are unspecified.
*/
case F_GETLK:
/* Get the first lock which blocks the lock description pointed to by the third
* argument, arg, taken as a pointer to type struct flock, defined in <fcntl.h>.
* The information retrieved shall overwrite the information passed to fcntl() in
* the structure flock. If no lock is found that would prevent this lock from being
* created, then the structure shall be left unchanged except for the lock type
* which shall be set to F_UNLCK.
*/
case F_SETLK:
/* Set or clear a file segment lock according to the lock description pointed to
* by the third argument, arg, taken as a pointer to type struct flock, defined in
* <fcntl.h>. F_SETLK can establish shared (or read) locks (F_RDLCK) or exclusive
* (or write) locks (F_WRLCK), as well as to remove either type of lock (F_UNLCK).
* F_RDLCK, F_WRLCK, and F_UNLCK are defined in <fcntl.h>. If a shared or exclusive
* lock cannot be set, fcntl() shall return immediately with a return value of -1.
*/
case F_SETLKW:
/* This command shall be equivalent to F_SETLK except that if a shared or exclusive
* lock is blocked by other locks, the thread shall wait until the request can be
* satisfied. If a signal that is to be caught is received while fcntl() is waiting
* for a region, fcntl() shall be interrupted. Upon return from the signal handler,
* fcntl() shall return -1 with errno set to [EINTR], and the lock operation shall
* not be done.
*/
err = ENOSYS; /* F_GETOWN, F_SETOWN, F_GETLK, F_SETLK, F_SETLKW */
break;
default:
err = EINVAL;
break;
}
uip_unlock(flags);
errout:
if (err != 0)
{
errno = err;
return ERROR;
}
return ret;
}
#endif /* CONFIG_NET && CONFIG_NSOCKET_DESCRIPTORS > 0 */
|
