Merge "init: Add warning in init first stage mount"

#include <memory>

#include <android-base/chrono_utils.h>

#include <android-base/file.h>

#include <android-base/logging.h>

#include <android-base/scopeguard.h>

#include <android-base/stringprintf.h>

#include <cutils/uevent.h>

namespace android {

    int fd = openat(dfd, "uevent", O_WRONLY);

    if (fd >= 0) {

        android::base::Timer t;

        write(fd, "add\n", 4);

        const std::string fd_path = android::base::StringPrintf("/proc/self/fd/%d", fd);

        std::string uevent_file_path;

        android::base::Readlink(fd_path, &uevent_file_path);

        close(fd);

        auto guard = android::base::make_scope_guard([&t, &uevent_file_path]() {

            if (t.duration() > 50ms) {

                LOG(WARNING) << "ReadUevent took " << t << " on '" << uevent_file_path << "'";

            }

        });

        Uevent uevent;

        while (ReadUevent(&uevent)) {

            if (callback(uevent) == ListenerAction::kStop) return ListenerAction::kStop;