1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
|
/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "android_os_NativeHandle.h"
#include <nativehelper/JNIHelp.h>
#include <nativehelper/ScopedLocalRef.h>
#include "core_jni_helpers.h"
#define PACKAGE_PATH "android/os"
#define CLASS_NAME "NativeHandle"
#define CLASS_PATH PACKAGE_PATH "/" CLASS_NAME
namespace android {
static struct {
jclass clazz;
jmethodID constructID; // NativeHandle(int[] fds, int[] ints, boolean owns)
jmethodID getFdsID; // int[] NativeHandle.getFds()
jmethodID getIntsID; // int[] NativeHandle.getInts()
} gNativeHandleFields;
jobject JNativeHandle::MakeJavaNativeHandleObj(
JNIEnv *env, const native_handle_t *handle) {
if (handle == nullptr) { return nullptr; }
const int numFds = handle->numFds;
ScopedLocalRef<jintArray> fds(env, env->NewIntArray(numFds));
env->SetIntArrayRegion(fds.get(), 0, numFds, &(handle->data[0]));
const int numInts = handle->numInts;
ScopedLocalRef<jintArray> ints(env, env->NewIntArray(numInts));
env->SetIntArrayRegion(ints.get(), 0, numInts, &(handle->data[numFds]));
return env->NewObject(gNativeHandleFields.clazz,
gNativeHandleFields.constructID, fds.get(), ints.get(), false /*own*/);
}
native_handle_t *JNativeHandle::MakeCppNativeHandle(
JNIEnv *env, jobject jHandle, EphemeralStorage *storage) {
if (jHandle == nullptr) { return nullptr; }
if (!env->IsInstanceOf(jHandle, gNativeHandleFields.clazz)) {
jniThrowException(env, "java/lang/ClassCastException",
"jHandle must be an instance of NativeHandle.");
return nullptr;
}
ScopedLocalRef<jintArray> fds(env, (jintArray) env->CallObjectMethod(
jHandle, gNativeHandleFields.getFdsID));
ScopedLocalRef<jintArray> ints(env, (jintArray) env->CallObjectMethod(
jHandle, gNativeHandleFields.getIntsID));
const int numFds = (int) env->GetArrayLength(fds.get());
const int numInts = (int) env->GetArrayLength(ints.get());
native_handle_t *handle = (storage == nullptr)
? native_handle_create(numFds, numInts)
: storage->allocTemporaryNativeHandle(numFds, numInts);
if (handle != nullptr) {
env->GetIntArrayRegion(fds.get(), 0, numFds, &(handle->data[0]));
env->GetIntArrayRegion(ints.get(), 0, numInts, &(handle->data[numFds]));
} else {
jniThrowException(env, "java/lang/OutOfMemoryError",
"Failed to allocate memory for native_handle_t.");
}
return handle;
}
jobjectArray JNativeHandle::AllocJavaNativeHandleObjArray(JNIEnv *env, jsize length) {
return env->NewObjectArray(length, gNativeHandleFields.clazz, nullptr);
}
int register_android_os_NativeHandle(JNIEnv *env) {
jclass clazz = FindClassOrDie(env, CLASS_PATH);
gNativeHandleFields.clazz = MakeGlobalRefOrDie(env, clazz);
gNativeHandleFields.constructID = GetMethodIDOrDie(env, clazz, "<init>", "([I[IZ)V");
gNativeHandleFields.getFdsID = GetMethodIDOrDie(env, clazz, "getFdsAsIntArray", "()[I");
gNativeHandleFields.getIntsID = GetMethodIDOrDie(env, clazz, "getInts", "()[I");
return 0;
}
}
|
