text: /*
   * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  
  #include <netdb.h>
  #include <sys/types.h>
  #include <sys/socket.h>
  #include <stdlib.h>
  #include <errno.h>
  #include <string.h>
  #include <poll.h>
  
  #if __linux__
  #include <netinet/in.h>
  #endif
  
  #include "jni.h"
  #include "jni_util.h"
  #include "net_util.h"
  #include "jvm.h"
  #include "jlong.h"
  #include "sun_nio_ch_SocketChannelImpl.h"
  #include "nio_util.h"
  #include "nio.h"
  
  
  JNIEXPORT jint JNICALL
  Java_sun_nio_ch_SocketChannelImpl_checkConnect(JNIEnv *env, jobject this,
                                                 jobject fdo, jboolean block,
                                                 jboolean ready)
  {
      int error = 0;
      socklen_t n = sizeof(int);
      jint fd = fdval(env, fdo);
      int result = 0;
      struct pollfd poller;
  
      poller.revents = 1;
      if (!ready) {
          poller.fd = fd;
          poller.events = POLLOUT;
          poller.revents = 0;
          result = poll(&poller, 1, block ? -1 : 0);
          if (result < 0) {
              JNU_ThrowIOExceptionWithLastError(env, "Poll failed");
              return IOS_THROWN;
          }
          if (!block && (result == 0))
              return IOS_UNAVAILABLE;
      }
  
      if (poller.revents) {
          errno = 0;
          result = getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &n);
          if (result < 0) {
              handleSocketError(env, errno);
              return JNI_FALSE;
          } else if (error) {
              handleSocketError(env, error);
              return JNI_FALSE;
          }
          return 1;
      }
      return 0;
  }
  
  JNIEXPORT jint JNICALL
  Java_sun_nio_ch_SocketChannelImpl_sendOutOfBandData(JNIEnv* env, jclass this,
                                                      jobject fdo, jbyte b)
  {
      int n = send(fdval(env, fdo), (const void*)&b, 1, MSG_OOB);
      return convertReturnVal(env, n, JNI_FALSE);
  }
  