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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef NET_FD_H_included
     18 #define NET_FD_H_included
     19 
     20 #include "Errors.h"
     21 #include "JniUtil.h"
     22 
     23 /**
     24  * Wraps access to the int inside a java.io.FileDescriptor, taking care of throwing exceptions.
     25  */
     26 class NetFd {
     27 public:
     28     NetFd(JNIEnv* env, jobject fileDescriptor)
     29         : mEnv(env), mFileDescriptor(fileDescriptor), mFd(-1) {}
     30 
     31     bool isClosed() {
     32         mFd = conscrypt::JniUtil::jniGetFDFromFileDescriptor(mEnv, mFileDescriptor);
     33         bool closed = (mFd == -1);
     34         if (closed) {
     35             conscrypt::Errors::jniThrowException(mEnv, "java/net/SocketException", "Socket closed");
     36         }
     37         return closed;
     38     }
     39 
     40     int get() const {
     41         return mFd;
     42     }
     43 
     44 private:
     45     JNIEnv* mEnv;
     46     jobject mFileDescriptor;
     47     int mFd;
     48 
     49     // Disallow copy and assignment.
     50     NetFd(const NetFd&);
     51     void operator=(const NetFd&);
     52 };
     53 
     54 /**
     55  * Used to retry syscalls that can return EINTR. This differs from TEMP_FAILURE_RETRY in that
     56  * it also considers the case where the reason for failure is that another thread called
     57  * Socket.close.
     58  */
     59 #define NET_FAILURE_RETRY(fd, exp)                     \
     60     ({                                                 \
     61         typeof(exp) _rc;                               \
     62         do {                                           \
     63             _rc = (exp);                               \
     64             if (_rc == -1) {                           \
     65                 if (fd.isClosed() || errno != EINTR) { \
     66                     break;                             \
     67                 }                                      \
     68             }                                          \
     69         } while (_rc == -1);                           \
     70         _rc;                                           \
     71     })
     72 
     73 #endif  // NET_FD_H_included
     74