1 /*

     2  * Copyright (c) 2000, 2018, 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 "sun_nio_ch_SocketChannelImpl.h"

    44 #include "nio_util.h"

    45 #include "nio.h"

    46 

    47 

    48 JNIEXPORT jint JNICALL

    49 Java_sun_nio_ch_SocketChannelImpl_checkConnect(JNIEnv *env, jobject this,

    50                                                jobject fdo, jboolean block)

    51 {

    52     int error = 0;

    53     socklen_t n = sizeof(int);

    54     jint fd = fdval(env, fdo);

    55     int result = 0;

    56     struct pollfd poller;

    57 

    58     poller.fd = fd;

    59     poller.events = POLLOUT;

    60     poller.revents = 0;

    61     result = poll(&poller, 1, block ? -1 : 0);

    62 

    63     if (result < 0) {

    64         if (errno == EINTR) {

    65             return IOS_INTERRUPTED;

    66         } else {

    67             JNU_ThrowIOExceptionWithLastError(env, "poll failed");

    68             return IOS_THROWN;

    69         }

    70     }

    71     if (!block && (result == 0))

    72         return IOS_UNAVAILABLE;

    73 

    74     if (result > 0) {

    75         errno = 0;

    76         result = getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &n);

    77         if (result < 0) {

    78             return handleSocketError(env, errno);

    79         } else if (error) {

    80             return handleSocketError(env, error);

    81         } else if ((poller.revents & POLLHUP) != 0) {

    82             return handleSocketError(env, ENOTCONN);

    83         }

    84         // connected

    85         return 1;

    86     }

    87     return 0;

    88 }

    89 

    90 JNIEXPORT jint JNICALL

    91 Java_sun_nio_ch_SocketChannelImpl_sendOutOfBandData(JNIEnv* env, jclass this,

    92                                                     jobject fdo, jbyte b)

    93 {

    94     int n = send(fdval(env, fdo), (const void*)&b, 1, MSG_OOB);

    95     return convertReturnVal(env, n, JNI_FALSE);

    96 }