1 /* |
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2 * Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 /* |
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27 * KQueueArrayWrapper.c |
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28 * Implementation of Selector using FreeBSD / Mac OS X kqueues |
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29 * Derived from Sun's DevPollArrayWrapper |
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30 */ |
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31 |
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32 |
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33 #include "jni.h" |
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34 #include "jni_util.h" |
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35 #include "jvm.h" |
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36 #include "jlong.h" |
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37 #include "nio_util.h" |
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38 |
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39 #include <sys/types.h> |
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40 #include <sys/event.h> |
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41 #include <sys/time.h> |
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42 |
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43 JNIEXPORT void JNICALL |
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44 Java_sun_nio_ch_KQueueArrayWrapper_initStructSizes(JNIEnv *env, jclass clazz) |
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45 { |
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46 #define CHECK_EXCEPTION() { \ |
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47 if ((*env)->ExceptionCheck(env)) { \ |
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48 goto exceptionOccurred; \ |
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49 } \ |
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50 } |
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51 |
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52 #define CHECK_ERROR_AND_EXCEPTION(_field) { \ |
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53 if (_field == NULL) { \ |
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54 goto badField; \ |
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55 } \ |
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56 CHECK_EXCEPTION(); \ |
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57 } |
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58 |
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59 |
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60 jfieldID field; |
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61 |
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62 field = (*env)->GetStaticFieldID(env, clazz, "EVFILT_READ", "S"); |
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63 CHECK_ERROR_AND_EXCEPTION(field); |
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64 (*env)->SetStaticShortField(env, clazz, field, EVFILT_READ); |
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65 CHECK_EXCEPTION(); |
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66 |
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67 field = (*env)->GetStaticFieldID(env, clazz, "EVFILT_WRITE", "S"); |
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68 CHECK_ERROR_AND_EXCEPTION(field); |
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69 (*env)->SetStaticShortField(env, clazz, field, EVFILT_WRITE); |
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70 CHECK_EXCEPTION(); |
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71 |
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72 field = (*env)->GetStaticFieldID(env, clazz, "SIZEOF_KEVENT", "S"); |
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73 CHECK_ERROR_AND_EXCEPTION(field); |
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74 (*env)->SetStaticShortField(env, clazz, field, (short) sizeof(struct kevent)); |
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75 CHECK_EXCEPTION(); |
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76 |
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77 field = (*env)->GetStaticFieldID(env, clazz, "FD_OFFSET", "S"); |
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78 CHECK_ERROR_AND_EXCEPTION(field); |
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79 (*env)->SetStaticShortField(env, clazz, field, (short) offsetof(struct kevent, ident)); |
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80 CHECK_EXCEPTION(); |
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81 |
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82 field = (*env)->GetStaticFieldID(env, clazz, "FILTER_OFFSET", "S"); |
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83 CHECK_ERROR_AND_EXCEPTION(field); |
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84 (*env)->SetStaticShortField(env, clazz, field, (short) offsetof(struct kevent, filter)); |
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85 CHECK_EXCEPTION(); |
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86 return; |
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87 |
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88 badField: |
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89 return; |
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90 |
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91 exceptionOccurred: |
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92 return; |
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93 |
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94 #undef CHECK_EXCEPTION |
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95 #undef CHECK_ERROR_AND_EXCEPTION |
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96 } |
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97 |
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98 JNIEXPORT jint JNICALL |
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99 Java_sun_nio_ch_KQueueArrayWrapper_init(JNIEnv *env, jobject this) |
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100 { |
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101 int kq = kqueue(); |
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102 if (kq < 0) { |
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103 JNU_ThrowIOExceptionWithLastError(env, "KQueueArrayWrapper: kqueue() failed"); |
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104 } |
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105 return kq; |
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106 } |
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107 |
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108 |
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109 JNIEXPORT void JNICALL |
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110 Java_sun_nio_ch_KQueueArrayWrapper_register0(JNIEnv *env, jobject this, |
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111 jint kq, jint fd, jint r, jint w) |
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112 { |
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113 struct kevent changes[2]; |
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114 struct kevent errors[2]; |
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115 struct timespec dontBlock = {0, 0}; |
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116 |
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117 // if (r) then { register for read } else { unregister for read } |
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118 // if (w) then { register for write } else { unregister for write } |
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119 // Ignore errors - they're probably complaints about deleting non- |
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120 // added filters - but provide an error array anyway because |
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121 // kqueue behaves erratically if some of its registrations fail. |
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122 EV_SET(&changes[0], fd, EVFILT_READ, r ? EV_ADD : EV_DELETE, 0, 0, 0); |
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123 EV_SET(&changes[1], fd, EVFILT_WRITE, w ? EV_ADD : EV_DELETE, 0, 0, 0); |
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124 kevent(kq, changes, 2, errors, 2, &dontBlock); |
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125 } |
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126 |
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127 JNIEXPORT jint JNICALL |
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128 Java_sun_nio_ch_KQueueArrayWrapper_kevent0(JNIEnv *env, jobject this, jint kq, |
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129 jlong kevAddr, jint kevCount, |
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130 jlong timeout) |
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131 { |
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132 struct kevent *kevs = (struct kevent *)jlong_to_ptr(kevAddr); |
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133 struct timespec ts; |
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134 struct timespec *tsp; |
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135 int result; |
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136 |
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137 // Java timeout is in milliseconds. Convert to struct timespec. |
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138 // Java timeout == -1 : wait forever : timespec timeout of NULL |
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139 // Java timeout == 0 : return immediately : timespec timeout of zero |
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140 if (timeout >= 0) { |
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141 // For some indeterminate reason kevent(2) has been found to fail with |
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142 // an EINVAL error for timeout values greater than or equal to |
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143 // 100000001000L. To avoid this problem, clamp the timeout arbitrarily |
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144 // to the maximum value of a 32-bit signed integer which is |
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145 // approximately 25 days in milliseconds. |
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146 const jlong timeoutMax = 0x7fffffff; // java.lang.Integer.MAX_VALUE |
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147 if (timeout > timeoutMax) { |
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148 timeout = timeoutMax; |
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149 } |
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150 ts.tv_sec = timeout / 1000; |
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151 ts.tv_nsec = (timeout % 1000) * 1000000; //nanosec = 1 million millisec |
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152 tsp = &ts; |
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153 } else { |
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154 tsp = NULL; |
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155 } |
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156 |
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157 RESTARTABLE(kevent(kq, NULL, 0, kevs, kevCount, tsp), result); |
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158 if (result < 0) { |
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159 JNU_ThrowIOExceptionWithLastError(env, |
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160 "KQueueArrayWrapper: kevent poll failed"); |
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161 } |
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162 |
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163 return result; |
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164 } |
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165 |
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166 |
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167 JNIEXPORT void JNICALL |
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168 Java_sun_nio_ch_KQueueArrayWrapper_interrupt(JNIEnv *env, jclass cls, jint fd) |
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169 { |
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170 char c = 1; |
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171 if (1 != write(fd, &c, 1)) { |
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172 JNU_ThrowIOExceptionWithLastError(env, "KQueueArrayWrapper: interrupt failed"); |
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173 } |
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174 } |
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175 |
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