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
|
/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdint.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <fcntl.h>
#include <unistd.h>
#include <utils/Errors.h>
#include <binder/Parcel.h>
#include <gui/BitTube.h>
namespace android {
// ----------------------------------------------------------------------------
// Socket buffer size. The default is typically about 128KB, which is much larger than
// we really need. So we make it smaller.
static const size_t SOCKET_BUFFER_SIZE = 4 * 1024;
BitTube::BitTube()
: mSendFd(-1), mReceiveFd(-1)
{
int sockets[2];
if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, sockets) == 0) {
int size = SOCKET_BUFFER_SIZE;
setsockopt(sockets[0], SOL_SOCKET, SO_SNDBUF, &size, sizeof(size));
setsockopt(sockets[0], SOL_SOCKET, SO_RCVBUF, &size, sizeof(size));
setsockopt(sockets[1], SOL_SOCKET, SO_SNDBUF, &size, sizeof(size));
setsockopt(sockets[1], SOL_SOCKET, SO_RCVBUF, &size, sizeof(size));
fcntl(sockets[0], F_SETFL, O_NONBLOCK);
fcntl(sockets[1], F_SETFL, O_NONBLOCK);
mReceiveFd = sockets[0];
mSendFd = sockets[1];
} else {
mReceiveFd = -errno;
ALOGE("BitTube: pipe creation failed (%s)", strerror(-mReceiveFd));
}
}
BitTube::BitTube(const Parcel& data)
: mSendFd(-1), mReceiveFd(-1)
{
mReceiveFd = dup(data.readFileDescriptor());
if (mReceiveFd >= 0) {
int size = SOCKET_BUFFER_SIZE;
setsockopt(mReceiveFd, SOL_SOCKET, SO_SNDBUF, &size, sizeof(size));
setsockopt(mReceiveFd, SOL_SOCKET, SO_RCVBUF, &size, sizeof(size));
fcntl(mReceiveFd, F_SETFL, O_NONBLOCK);
} else {
mReceiveFd = -errno;
ALOGE("BitTube(Parcel): can't dup filedescriptor (%s)",
strerror(-mReceiveFd));
}
}
BitTube::~BitTube()
{
if (mSendFd >= 0)
close(mSendFd);
if (mReceiveFd >= 0)
close(mReceiveFd);
}
status_t BitTube::initCheck() const
{
if (mReceiveFd < 0) {
return status_t(mReceiveFd);
}
return NO_ERROR;
}
int BitTube::getFd() const
{
return mReceiveFd;
}
ssize_t BitTube::write(void const* vaddr, size_t size)
{
ssize_t err, len;
do {
len = ::send(mSendFd, vaddr, size, MSG_DONTWAIT | MSG_NOSIGNAL);
err = len < 0 ? errno : 0;
} while (err == EINTR);
return err == 0 ? len : -err;
}
ssize_t BitTube::read(void* vaddr, size_t size)
{
ssize_t err, len;
do {
len = ::recv(mReceiveFd, vaddr, size, MSG_DONTWAIT);
err = len < 0 ? errno : 0;
} while (err == EINTR);
if (err == EAGAIN || err == EWOULDBLOCK) {
// EAGAIN means that we have non-blocking I/O but there was
// no data to be read. Nothing the client should care about.
return 0;
}
return err == 0 ? len : -err;
}
status_t BitTube::writeToParcel(Parcel* reply) const
{
if (mReceiveFd < 0)
return -EINVAL;
status_t result = reply->writeDupFileDescriptor(mReceiveFd);
close(mReceiveFd);
mReceiveFd = -1;
return result;
}
ssize_t BitTube::sendObjects(const sp<BitTube>& tube,
void const* events, size_t count, size_t objSize)
{
ssize_t numObjects = 0;
for (size_t i=0 ; i<count ; i++) {
const char* vaddr = reinterpret_cast<const char*>(events) + objSize * i;
ssize_t size = tube->write(vaddr, objSize);
if (size < 0) {
// error occurred
return size;
} else if (size == 0) {
// no more space
break;
}
numObjects++;
}
return numObjects;
}
ssize_t BitTube::recvObjects(const sp<BitTube>& tube,
void* events, size_t count, size_t objSize)
{
ssize_t numObjects = 0;
for (size_t i=0 ; i<count ; i++) {
char* vaddr = reinterpret_cast<char*>(events) + objSize * i;
ssize_t size = tube->read(vaddr, objSize);
if (size < 0) {
// error occurred
return size;
} else if (size == 0) {
// no more messages
break;
}
numObjects++;
}
return numObjects;
}
// ----------------------------------------------------------------------------
}; // namespace android
|
