94d800d96f
Mainline M-2025-11 drops support for android R, thus making the new minimum Android 12 / S (api 31) Once we get this to pass tests, we can merge it, then we need to bump min sdk to 31, then we can probably get rid of the dlsym stuff and just link it directly. Test: TreeHugger Flag: EXEMPT mainline Signed-off-by: Maciej Żenczykowski <maze@google.com Change-Id: I9d68ea9f4aa180b3ec24d252bcd49593e19cf475
51 lines
1.7 KiB
C++
51 lines
1.7 KiB
C++
// Copyright (C) 2020 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#define LOG_TAG "netjniutils"
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#include "netjniutils/netjniutils.h"
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#include <dlfcn.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <android/log.h>
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namespace android {
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namespace netjniutils {
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int GetNativeFileDescriptor(JNIEnv* env, jobject javaFd) {
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if (!javaFd) return -1;
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// Since Android S, there is an NDK API to get a file descriptor present in libnativehelper.so.
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// libnativehelper is loaded into all processes by the zygote since the zygote uses it
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// to load the Android Runtime and is also a public library (because of the NDK API).
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typedef int (*ndkGetFd_t)(JNIEnv*, jobject);
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static const ndkGetFd_t ndkGetFd = []() -> ndkGetFd_t {
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void* handle = dlopen("libnativehelper.so", RTLD_NOLOAD | RTLD_NODELETE);
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auto ndkGetFd = reinterpret_cast<ndkGetFd_t>(dlsym(handle, "AFileDescriptor_getFd"));
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if (ndkGetFd == nullptr) {
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__android_log_print(ANDROID_LOG_FATAL, LOG_TAG,
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"Failed to dlsym(AFileDescriptor_getFd): %s", dlerror());
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dlclose(handle);
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abort();
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}
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return ndkGetFd;
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}();
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return ndkGetFd(env, javaFd);
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}
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} // namespace netjniutils
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} // namespace android
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