1 /* 2 * Copyright (c) 2017, 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 #include <sys/socket.h> 26 #include <string.h> 27 #include <errno.h> 28 #include <unistd.h> 29 30 #include <jni.h> 31 #include <netinet/tcp.h> 32 #include "jni_util.h" 33 34 static void throwByNameWithLastError(JNIEnv *env, const char *name, 35 const char *defaultDetail) { 36 char defaultMsg[255]; 37 sprintf(defaultMsg, "errno: %d, %s", errno, defaultDetail); 38 JNU_ThrowByNameWithLastError(env, name, defaultMsg); 39 } 40 41 /* 42 * Class: jdk_net_LinuxSocketOptions 43 * Method: setQuickAck 44 * Signature: (II)V 45 */ 46 JNIEXPORT void JNICALL Java_jdk_net_LinuxSocketOptions_setQuickAck 47 (JNIEnv *env, jobject unused, jint fd, jboolean on) { 48 int optval; 49 int rv; 50 optval = (on ? 1 : 0); 51 rv = setsockopt(fd, SOL_SOCKET, TCP_QUICKACK, &optval, sizeof (optval)); 52 if (rv < 0) { 53 if (errno == ENOPROTOOPT) { 54 JNU_ThrowByName(env, "java/lang/UnsupportedOperationException", 55 "unsupported socket option"); 56 } else { 57 throwByNameWithLastError(env, "java/net/SocketException", 58 "set option SO_QUICKACK failed"); 59 } 60 } 61 } 62 63 /* 64 * Class: jdk_net_LinuxSocketOptions 65 * Method: getQuickAck 66 * Signature: (I)I; 67 */ 68 JNIEXPORT jint JNICALL Java_jdk_net_LinuxSocketOptions_getQuickAck0 69 (JNIEnv *env, jobject unused, jint fd) { 70 int on; 71 socklen_t sz = sizeof (on); 72 int rv = getsockopt(fd, SOL_SOCKET, TCP_QUICKACK, &on, &sz); 73 if (rv < 0) { 74 if (errno == ENOPROTOOPT) { 75 JNU_ThrowByName(env, "java/lang/UnsupportedOperationException", 76 "unsupported socket option"); 77 } else { 78 throwByNameWithLastError(env, "java/net/SocketException", 79 "get option SO_QUICKACK failed"); 80 } 81 } 82 return on; 83 } 84 85 /* 86 * Class: jdk_net_LinuxSocketOptions 87 * Method: quickAckSupported 88 * Signature: ()Z 89 */ 90 JNIEXPORT jboolean JNICALL Java_jdk_net_LinuxSocketOptions_quickAckSupported 91 (JNIEnv *env, jobject unused) { 92 int one = 1; 93 int rv, s; 94 s = socket(PF_INET, SOCK_STREAM, 0); 95 if (s < 0) { 96 return JNI_FALSE; 97 } 98 rv = setsockopt(s, SOL_SOCKET, TCP_QUICKACK, (void *) &one, sizeof (one)); 99 if (rv != 0 && errno == ENOPROTOOPT) { 100 rv = JNI_FALSE; 101 } else { 102 rv = JNI_TRUE; 103 } 104 close(s); 105 return rv; 106 }