libs/dumputils/dump_utils.cpp

/*
 * 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 <set>

#include <android-base/file.h>
#include <android-base/stringprintf.h>
#include <android/hidl/manager/1.0/IServiceManager.h>
#include <dumputils/dump_utils.h>
#include <log/log.h>

/* list of native processes to include in the native dumps */
// This matches the /proc/pid/exe link instead of /proc/pid/cmdline.
static const char* native_processes_to_dump[] = {
        "/system/bin/audioserver",
        "/system/bin/cameraserver",
        "/system/bin/drmserver",
        "/system/bin/mediadrmserver",
        "/system/bin/mediaextractor", // media.extractor
        "/system/bin/mediametrics", // media.metrics
        "/system/bin/mediaserver",
        "/system/bin/sdcard",
        "/system/bin/statsd",
        "/system/bin/surfaceflinger",
        "/system/bin/vehicle_network_service",
        "/vendor/bin/hw/android.hardware.media.omx@1.0-service", // media.codec
        NULL,
};

/* list of hal interface to dump containing process during native dumps */
static const char* hal_interfaces_to_dump[] {
        "android.hardware.audio@2.0::IDevicesFactory",
        "android.hardware.bluetooth@1.0::IBluetoothHci",
        "android.hardware.camera.provider@2.4::ICameraProvider",
        "android.hardware.drm@1.0::IDrmFactory",
        "android.hardware.graphics.composer@2.1::IComposer",
        "android.hardware.media.omx@1.0::IOmx",
        "android.hardware.sensors@1.0::ISensors",
        "android.hardware.vr@1.0::IVr",
        NULL,
};

bool should_dump_hal_interface(const char* interface) {
    for (const char** i = hal_interfaces_to_dump; *i; i++) {
        if (!strcmp(*i, interface)) {
            return true;
        }
    }
    return false;
}

bool should_dump_native_traces(const char* path) {
    for (const char** p = native_processes_to_dump; *p; p++) {
        if (!strcmp(*p, path)) {
            return true;
        }
    }
    return false;
}

std::set<int> get_interesting_hal_pids() {
    using android::hidl::manager::V1_0::IServiceManager;
    using android::sp;
    using android::hardware::Return;

    sp<IServiceManager> manager = IServiceManager::getService();
    std::set<int> pids;

    Return<void> ret = manager->debugDump([&](auto& hals) {
        for (const auto &info : hals) {
            if (info.pid == static_cast<int>(IServiceManager::PidConstant::NO_PID)) {
                continue;
            }

            if (!should_dump_hal_interface(info.interfaceName.c_str())) {
                continue;
            }

            pids.insert(info.pid);
        }
    });

    if (!ret.isOk()) {
        ALOGE("Could not get list of HAL PIDs: %s\n", ret.description().c_str());
    }

    return pids; // whether it was okay or not
}

bool IsZygote(int pid) {
    static const std::string kZygotePrefix = "zygote";

    std::string cmdline;
    if (!android::base::ReadFileToString(android::base::StringPrintf("/proc/%d/cmdline", pid),
                                         &cmdline)) {
        return true;
    }

    return (cmdline.find(kZygotePrefix) == 0);
}