split libsensor our of libgui
Test: compile & run
Bug: treble cleanup
Change-Id: I5b2c2a14f7d3b364d25695cf0901c5b08cfb0fc9
diff --git a/libs/sensor/BitTube.cpp b/libs/sensor/BitTube.cpp
new file mode 100644
index 0000000..93555c8
--- /dev/null
+++ b/libs/sensor/BitTube.cpp
@@ -0,0 +1,174 @@
+/*
+ * 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 <sensor/BitTube.h>
+
+#include <stdint.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#include <fcntl.h>
+#include <unistd.h>
+
+#include <binder/Parcel.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 DEFAULT_SOCKET_BUFFER_SIZE = 4 * 1024;
+
+
+BitTube::BitTube()
+ : mSendFd(-1), mReceiveFd(-1)
+{
+ init(DEFAULT_SOCKET_BUFFER_SIZE, DEFAULT_SOCKET_BUFFER_SIZE);
+}
+
+BitTube::BitTube(size_t bufsize)
+ : mSendFd(-1), mReceiveFd(-1)
+{
+ init(bufsize, bufsize);
+}
+
+BitTube::BitTube(const Parcel& data)
+ : mSendFd(-1), mReceiveFd(-1)
+{
+ mReceiveFd = dup(data.readFileDescriptor());
+ if (mReceiveFd < 0) {
+ mReceiveFd = -errno;
+ ALOGE("BitTube(Parcel): can't dup filedescriptor (%s)",
+ strerror(-mReceiveFd));
+ }
+}
+
+BitTube::~BitTube()
+{
+ if (mSendFd >= 0)
+ close(mSendFd);
+
+ if (mReceiveFd >= 0)
+ close(mReceiveFd);
+}
+
+void BitTube::init(size_t rcvbuf, size_t sndbuf) {
+ int sockets[2];
+ if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, sockets) == 0) {
+ size_t size = DEFAULT_SOCKET_BUFFER_SIZE;
+ setsockopt(sockets[0], SOL_SOCKET, SO_RCVBUF, &rcvbuf, sizeof(rcvbuf));
+ setsockopt(sockets[1], SOL_SOCKET, SO_SNDBUF, &sndbuf, sizeof(sndbuf));
+ // sine we don't use the "return channel", we keep it small...
+ setsockopt(sockets[0], 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));
+ }
+}
+
+status_t BitTube::initCheck() const
+{
+ if (mReceiveFd < 0) {
+ return status_t(mReceiveFd);
+ }
+ return NO_ERROR;
+}
+
+int BitTube::getFd() const
+{
+ return mReceiveFd;
+}
+
+int BitTube::getSendFd() const
+{
+ return mSendFd;
+}
+
+ssize_t BitTube::write(void const* vaddr, size_t size)
+{
+ ssize_t err, len;
+ do {
+ len = ::send(mSendFd, vaddr, size, MSG_DONTWAIT | MSG_NOSIGNAL);
+ // cannot return less than size, since we're using SOCK_SEQPACKET
+ 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)
+{
+ const char* vaddr = reinterpret_cast<const char*>(events);
+ ssize_t size = tube->write(vaddr, count*objSize);
+
+ // should never happen because of SOCK_SEQPACKET
+ LOG_ALWAYS_FATAL_IF((size >= 0) && (size % static_cast<ssize_t>(objSize)),
+ "BitTube::sendObjects(count=%zu, size=%zu), res=%zd (partial events were sent!)",
+ count, objSize, size);
+
+ //ALOGE_IF(size<0, "error %d sending %d events", size, count);
+ return size < 0 ? size : size / static_cast<ssize_t>(objSize);
+}
+
+ssize_t BitTube::recvObjects(const sp<BitTube>& tube,
+ void* events, size_t count, size_t objSize)
+{
+ char* vaddr = reinterpret_cast<char*>(events);
+ ssize_t size = tube->read(vaddr, count*objSize);
+
+ // should never happen because of SOCK_SEQPACKET
+ LOG_ALWAYS_FATAL_IF((size >= 0) && (size % static_cast<ssize_t>(objSize)),
+ "BitTube::recvObjects(count=%zu, size=%zu), res=%zd (partial events were received!)",
+ count, objSize, size);
+
+ //ALOGE_IF(size<0, "error %d receiving %d events", size, count);
+ return size < 0 ? size : size / static_cast<ssize_t>(objSize);
+}
+
+// ----------------------------------------------------------------------------
+}; // namespace android