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/*
* Copyright 2015 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 <binder/ProcessInfoService.h>
#include <binder/IServiceManager.h>
#include <utils/Log.h>
#include <utils/String16.h>
namespace android {
ProcessInfoService::ProcessInfoService() {
updateBinderLocked();
}
status_t ProcessInfoService::getProcessStatesImpl(size_t length, /*in*/ int32_t* pids,
/*out*/ int32_t* states) {
status_t err = NO_ERROR;
sp<IProcessInfoService> pis;
mProcessInfoLock.lock();
pis = mProcessInfoService;
mProcessInfoLock.unlock();
for (int i = 0; i < BINDER_ATTEMPT_LIMIT; i++) {
if (pis != NULL) {
err = pis->getProcessStatesFromPids(length, /*in*/ pids, /*out*/ states);
if (err == NO_ERROR) return NO_ERROR; // success
if (IInterface::asBinder(pis)->isBinderAlive()) return err;
}
sleep(1);
mProcessInfoLock.lock();
if (pis == mProcessInfoService) {
updateBinderLocked();
}
pis = mProcessInfoService;
mProcessInfoLock.unlock();
}
ALOGW("%s: Could not retrieve process states from ProcessInfoService after %d retries.",
__FUNCTION__, BINDER_ATTEMPT_LIMIT);
return TIMED_OUT;
}
void ProcessInfoService::updateBinderLocked() {
const sp<IServiceManager> sm(defaultServiceManager());
if (sm != NULL) {
const String16 name("processinfo");
mProcessInfoService = interface_cast<IProcessInfoService>(sm->checkService(name));
}
}
ANDROID_SINGLETON_STATIC_INSTANCE(ProcessInfoService);
}; // namespace android
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