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      1 /*
      2  * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
      3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
      4  *
      5  * This code is free software; you can redistribute it and/or modify it
      6  * under the terms of the GNU General Public License version 2 only, as
      7  * published by the Free Software Foundation.  Oracle designates this
      8  * particular file as subject to the "Classpath" exception as provided
      9  * by Oracle in the LICENSE file that accompanied this code.
     10  *
     11  * This code is distributed in the hope that it will be useful, but WITHOUT
     12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
     13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
     14  * version 2 for more details (a copy is included in the LICENSE file that
     15  * accompanied this code).
     16  *
     17  * You should have received a copy of the GNU General Public License version
     18  * 2 along with this work; if not, write to the Free Software Foundation,
     19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
     20  *
     21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
     22  * or visit www.oracle.com if you need additional information or have any
     23  * questions.
     24  */
     25 
     26 #include <netdb.h>
     27 #include <sys/types.h>
     28 #include <sys/socket.h>
     29 #include <stdlib.h>
     30 #include <errno.h>
     31 #include <string.h>
     32 #include <poll.h>
     33 
     34 #if __linux__
     35 #include <netinet/in.h>
     36 #endif
     37 
     38 #include "jni.h"
     39 #include "jni_util.h"
     40 #include "net_util.h"
     41 #include "jvm.h"
     42 #include "jlong.h"
     43 #include "nio_util.h"
     44 #include "nio.h"
     45 
     46 #include <nativehelper/JNIHelp.h>
     47 
     48 #define NATIVE_METHOD(className, functionName, signature) \
     49 { #functionName, signature, (void*)(Java_sun_nio_ch_ ## className ## _ ## functionName) }
     50 
     51 JNIEXPORT jint JNICALL
     52 Java_sun_nio_ch_SocketChannelImpl_checkConnect(JNIEnv *env, jobject this,
     53                                                jobject fdo, jboolean block,
     54                                                jboolean ready)
     55 {
     56     int error = 0;
     57     socklen_t n = sizeof(int);
     58     jint fd = fdval(env, fdo);
     59     int result = 0;
     60     struct pollfd poller;
     61 
     62     poller.revents = 1;
     63     if (!ready) {
     64         poller.fd = fd;
     65         poller.events = POLLOUT;
     66         poller.revents = 0;
     67         result = poll(&poller, 1, block ? -1 : 0);
     68         if (result < 0) {
     69             JNU_ThrowIOExceptionWithLastError(env, "Poll failed");
     70             return IOS_THROWN;
     71         }
     72         if (!block && (result == 0))
     73             return IOS_UNAVAILABLE;
     74     }
     75 
     76     if (poller.revents) {
     77         errno = 0;
     78         result = getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &n);
     79         if (result < 0) {
     80             handleSocketError(env, errno);
     81             return JNI_FALSE;
     82         } else if (error) {
     83             handleSocketError(env, error);
     84             return JNI_FALSE;
     85         }
     86         return 1;
     87     }
     88     return 0;
     89 }
     90 
     91 JNIEXPORT jint JNICALL
     92 Java_sun_nio_ch_SocketChannelImpl_sendOutOfBandData(JNIEnv* env, jclass this,
     93                                                     jobject fdo, jbyte b)
     94 {
     95     int n = send(fdval(env, fdo), (const void*)&b, 1, MSG_OOB);
     96     return convertReturnVal(env, n, JNI_FALSE);
     97 }
     98 
     99 static JNINativeMethod gMethods[] = {
    100   NATIVE_METHOD(SocketChannelImpl, checkConnect, "(Ljava/io/FileDescriptor;ZZ)I"),
    101   NATIVE_METHOD(SocketChannelImpl, sendOutOfBandData, "(Ljava/io/FileDescriptor;B)I"),
    102 };
    103 
    104 void register_sun_nio_ch_SocketChannelImpl(JNIEnv* env) {
    105   jniRegisterNativeMethods(env, "sun/nio/ch/SocketChannelImpl", gMethods, NELEM(gMethods));
    106 }
    107