1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define LOG_TAG "System"
18
19 #include "JNIHelp.h"
20 #include "JniConstants.h"
21 #include "ScopedUtfChars.h"
22 #include "cutils/log.h"
23 #include "openssl/opensslv.h"
24 #include "toStringArray.h"
25 #include "zlib.h"
26
27 #include <string>
28 #include <vector>
29
30 #include <limits.h>
31 #include <stdlib.h>
32 #include <string.h>
33 #include <sys/time.h>
34 #include <time.h>
35 #include <unistd.h>
36
37 #if defined(HAVE_ANDROID_OS)
38 extern "C" void android_get_LD_LIBRARY_PATH(char*, size_t);
39 #endif
40
System_log(JNIEnv * env,jclass,jchar type,jstring javaMessage,jthrowable exception)41 static void System_log(JNIEnv* env, jclass, jchar type, jstring javaMessage, jthrowable exception) {
42 ScopedUtfChars message(env, javaMessage);
43 if (message.c_str() == NULL) {
44 // Since this function is used for last-gasp debugging output, be noisy on failure.
45 ALOGE("message.c_str() == NULL");
46 return;
47 }
48 int priority;
49 switch (type) {
50 case 'D': case 'd': priority = ANDROID_LOG_DEBUG; break;
51 case 'E': case 'e': priority = ANDROID_LOG_ERROR; break;
52 case 'F': case 'f': priority = ANDROID_LOG_FATAL; break;
53 case 'I': case 'i': priority = ANDROID_LOG_INFO; break;
54 case 'S': case 's': priority = ANDROID_LOG_SILENT; break;
55 case 'V': case 'v': priority = ANDROID_LOG_VERBOSE; break;
56 case 'W': case 'w': priority = ANDROID_LOG_WARN; break;
57 default: priority = ANDROID_LOG_DEFAULT; break;
58 }
59 LOG_PRI(priority, LOG_TAG, "%s", message.c_str());
60 if (exception != NULL) {
61 jniLogException(env, priority, LOG_TAG, exception);
62 }
63 }
64
65 // Sets a field via JNI. Used for the standard streams, which are read-only otherwise.
System_setFieldImpl(JNIEnv * env,jclass clazz,jstring javaName,jstring javaSignature,jobject object)66 static void System_setFieldImpl(JNIEnv* env, jclass clazz,
67 jstring javaName, jstring javaSignature, jobject object) {
68 ScopedUtfChars name(env, javaName);
69 if (name.c_str() == NULL) {
70 return;
71 }
72 ScopedUtfChars signature(env, javaSignature);
73 if (signature.c_str() == NULL) {
74 return;
75 }
76 jfieldID fieldID = env->GetStaticFieldID(clazz, name.c_str(), signature.c_str());
77 env->SetStaticObjectField(clazz, fieldID, object);
78 }
79
System_specialProperties(JNIEnv * env,jclass)80 static jobjectArray System_specialProperties(JNIEnv* env, jclass) {
81 std::vector<std::string> properties;
82
83 char path[PATH_MAX];
84 properties.push_back(std::string("user.dir=") + getcwd(path, sizeof(path)));
85
86 properties.push_back("android.zlib.version=" ZLIB_VERSION);
87 properties.push_back("android.openssl.version=" OPENSSL_VERSION_TEXT);
88
89 const char* library_path = getenv("LD_LIBRARY_PATH");
90 #if defined(HAVE_ANDROID_OS)
91 if (library_path == NULL) {
92 android_get_LD_LIBRARY_PATH(path, sizeof(path));
93 library_path = path;
94 }
95 #endif
96 if (library_path == NULL) {
97 library_path = "";
98 }
99 properties.push_back(std::string("java.library.path=") + library_path);
100
101 return toStringArray(env, properties);
102 }
103
System_currentTimeMillis(JNIEnv *,jclass)104 static jlong System_currentTimeMillis(JNIEnv*, jclass) {
105 timeval now;
106 gettimeofday(&now, NULL);
107 jlong when = now.tv_sec * 1000LL + now.tv_usec / 1000;
108 return when;
109 }
110
System_nanoTime(JNIEnv *,jclass)111 static jlong System_nanoTime(JNIEnv*, jclass) {
112 #if defined(HAVE_POSIX_CLOCKS)
113 timespec now;
114 clock_gettime(CLOCK_MONOTONIC, &now);
115 return now.tv_sec * 1000000000LL + now.tv_nsec;
116 #else
117 timeval now;
118 gettimeofday(&now, NULL);
119 return static_cast<jlong>(now.tv_sec) * 1000000000LL + now.tv_usec * 1000LL;
120 #endif
121 }
122
System_mapLibraryName(JNIEnv * env,jclass,jstring javaName)123 static jstring System_mapLibraryName(JNIEnv* env, jclass, jstring javaName) {
124 ScopedUtfChars name(env, javaName);
125 if (name.c_str() == NULL) {
126 return NULL;
127 }
128 char* mappedName = NULL;
129 asprintf(&mappedName, OS_SHARED_LIB_FORMAT_STR, name.c_str());
130 jstring result = env->NewStringUTF(mappedName);
131 free(mappedName);
132 return result;
133 }
134
135 static JNINativeMethod gMethods[] = {
136 NATIVE_METHOD(System, currentTimeMillis, "!()J"),
137 NATIVE_METHOD(System, log, "(CLjava/lang/String;Ljava/lang/Throwable;)V"),
138 NATIVE_METHOD(System, mapLibraryName, "(Ljava/lang/String;)Ljava/lang/String;"),
139 NATIVE_METHOD(System, nanoTime, "!()J"),
140 NATIVE_METHOD(System, setFieldImpl, "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/Object;)V"),
141 NATIVE_METHOD(System, specialProperties, "()[Ljava/lang/String;"),
142 };
register_java_lang_System(JNIEnv * env)143 void register_java_lang_System(JNIEnv* env) {
144 jniRegisterNativeMethods(env, "java/lang/System", gMethods, NELEM(gMethods));
145 }
146