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 "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                                                jboolean ready)
  52 {
  53     int error = 0;
  54     socklen_t n = sizeof(int);
  55     jint fd = fdval(env, fdo);
  56     int result = 0;
  57     struct pollfd poller;
  58 
  59     poller.revents = 1;
  60     if (!ready) {
  61         poller.fd = fd;
  62         poller.events = POLLOUT;
  63         poller.revents = 0;
  64         result = poll(&poller, 1, block ? -1 : 0);
  65         if (result < 0) {
  66             JNU_ThrowIOExceptionWithLastError(env, "Poll failed");
  67             return IOS_THROWN;
  68         }
  69         if (!block && (result == 0))
  70             return IOS_UNAVAILABLE;
  71     }
  72 
  73     if (poller.revents) {
  74         errno = 0;
  75         result = getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &n);
  76         if (result < 0) {
  77             handleSocketError(env, errno);
  78             return JNI_FALSE;
  79         } else if (error) {
  80             handleSocketError(env, error);
  81             return JNI_FALSE;
  82         }
  83         return 1;
  84     }
  85     return 0;
  86 }
  87 
  88 JNIEXPORT jint JNICALL
  89 Java_sun_nio_ch_SocketChannelImpl_sendOutOfBandData(JNIEnv* env, jclass this,
  90                                                     jobject fdo, jbyte b)
  91 {
  92     int n = send(fdval(env, fdo), (const void*)&b, 1, MSG_OOB);
  93     return convertReturnVal(env, n, JNI_FALSE);
  94 }