static bool ReapOneProcess() {
    siginfo_t siginfo = {};
    // This returns a zombie pid or informs us that there are no zombies left to be reaped.
    // It does NOT reap the pid; that is done below.
    if (TEMP_FAILURE_RETRY(waitid(P_ALL, 0, &siginfo, WEXITED | WNOHANG | WNOWAIT)) != 0) {
        PLOG(ERROR) << "waitid failed";
        return false;
    }

    auto pid = siginfo.si_pid;
    if (pid == 0) return false;

    // At this point we know we have a zombie pid, so we use this scopeguard to reap the pid
    // whenever the function returns from this point forward.
    // We do NOT want to reap the zombie earlier as in Service::Reap(), we kill(-pid, ...) and we
    // want the pid to remain valid throughout that (and potentially future) usages.
    auto reaper = make_scope_guard([pid] { TEMP_FAILURE_RETRY(waitpid(pid, nullptr, WNOHANG)); });

    std::string name;
    std::string wait_string;
    Service* service = nullptr;

    if (PropertyChildReap(pid)) {
        name = "Async property child";
    } else if (SubcontextChildReap(pid)) {
        name = "Subcontext";
    } else {
        service = ServiceList::GetInstance().FindService(pid, &Service::pid);

        if (service) {
            name = StringPrintf("Service '%s' (pid %d)", service->name().c_str(), pid);
            if (service->flags() & SVC_EXEC) {
                auto exec_duration = boot_clock::now() - service->time_started();
                auto exec_duration_ms =
                    std::chrono::duration_cast<std::chrono::milliseconds>(exec_duration).count();
                wait_string = StringPrintf(" waiting took %f seconds", exec_duration_ms / 1000.0f);
            }
        } else {
            name = StringPrintf("Untracked pid %d", pid);
        }
    }

    auto status = siginfo.si_status;
    if (WIFEXITED(status)) {
        LOG(INFO) << name << " exited with status " << WEXITSTATUS(status) << wait_string;
    } else if (WIFSIGNALED(status)) {
        LOG(INFO) << name << " killed by signal " << WTERMSIG(status) << wait_string;
    }

    if (!service) return true;

    service->Reap();

    if (service->flags() & SVC_TEMPORARY) {
        ServiceList::GetInstance().RemoveService(*service);
    }

    return true;
}
Beispiel #2
0
bool ServiceManager::ReapOneProcess() {
    int status;
    pid_t pid = TEMP_FAILURE_RETRY(waitpid(-1, &status, WNOHANG));
    if (pid == 0) {
        return false;
    } else if (pid == -1) {
        PLOG(ERROR) << "waitpid failed";
        return false;
    }

    Service* svc = FindServiceByPid(pid);

    std::string name;
    if (svc) {
        name = android::base::StringPrintf("Service '%s' (pid %d)",
                                           svc->name().c_str(), pid);
    } else {
        name = android::base::StringPrintf("Untracked pid %d", pid);
    }

    if (WIFEXITED(status)) {
        LOG(VERBOSE) << name << " exited with status " << WEXITSTATUS(status);
    } else if (WIFSIGNALED(status)) {
        LOG(VERBOSE) << name << " killed by signal " << WTERMSIG(status);
    } else if (WIFSTOPPED(status)) {
        LOG(VERBOSE) << name << " stopped by signal " << WSTOPSIG(status);
    } else {
        LOG(VERBOSE) << name << " state changed";
    }

    if (!svc) {
        return true;
    }

    if (svc->Reap()) {
        waiting_for_exec = false;
        RemoveService(*svc);
    }

    return true;
}
bool ServiceManager::ReapOneProcess() {
    int status;
    pid_t pid = TEMP_FAILURE_RETRY(waitpid(-1, &status, WNOHANG));
    if (pid == 0) {
        return false;
    } else if (pid == -1) {
        ERROR("waitpid failed: %s\n", strerror(errno));
        return false;
    }

    Service* svc = FindServiceByPid(pid);

    std::string name;
    if (svc) {
        name = android::base::StringPrintf("Service '%s' (pid %d)",
                                           svc->name().c_str(), pid);
    } else {
        name = android::base::StringPrintf("Untracked pid %d", pid);
    }

    if (WIFEXITED(status)) {
        NOTICE("%s exited with status %d\n", name.c_str(), WEXITSTATUS(status));
    } else if (WIFSIGNALED(status)) {
        NOTICE("%s killed by signal %d\n", name.c_str(), WTERMSIG(status));
    } else if (WIFSTOPPED(status)) {
        NOTICE("%s stopped by signal %d\n", name.c_str(), WSTOPSIG(status));
    } else {
        NOTICE("%s state changed", name.c_str());
    }

    if (!svc) {
        return true;
    }

    if (svc->Reap()) {
        waiting_for_exec = false;
        RemoveService(*svc);
    }

    return true;
}