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/*
* 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.
*/
#ifndef NET_FD_H_included
#define NET_FD_H_included
/**
* Wraps access to the int inside a java.io.FileDescriptor, taking care of throwing exceptions.
*/
class NetFd {
public:
NetFd(JNIEnv* env, jobject fileDescriptor)
: mEnv(env), mFileDescriptor(fileDescriptor), mFd(-1)
{
}
bool isClosed() {
mFd = jniGetFDFromFileDescriptor(mEnv, mFileDescriptor);
bool closed = (mFd == -1);
if (closed) {
jniThrowException(mEnv, "java/net/SocketException", "Socket closed");
}
return closed;
}
int get() const {
return mFd;
}
private:
JNIEnv* mEnv;
jobject mFileDescriptor;
int mFd;
// Disallow copy and assignment.
NetFd(const NetFd&);
void operator=(const NetFd&);
};
/**
* Used to retry syscalls that can return EINTR. This differs from TEMP_FAILURE_RETRY in that
* it also considers the case where the reason for failure is that another thread called
* Socket.close.
*/
#define NET_FAILURE_RETRY(fd, exp) ({ \
typeof (exp) _rc; \
do { \
_rc = (exp); \
if (_rc == -1) { \
if (fd.isClosed() || errno != EINTR) { \
break; \
} \
} \
} while (_rc == -1); \
_rc; })
#endif // NET_FD_H_included
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