void unit_dump(Unit *u, FILE *f, const char *prefix) {
        char *t, **j;
        UnitDependency d;
        Iterator i;
        _cleanup_free_ char *p2 = NULL;
        const char *prefix2;
        char
                timestamp1[FORMAT_TIMESTAMP_MAX],
                timestamp2[FORMAT_TIMESTAMP_MAX],
                timestamp3[FORMAT_TIMESTAMP_MAX],
                timestamp4[FORMAT_TIMESTAMP_MAX],
                timespan[FORMAT_TIMESPAN_MAX];
        Unit *following;
        _cleanup_set_free_ Set *following_set = NULL;
        int r;

        assert(u);
        assert(u->type >= 0);

        if (!prefix)
                prefix = "";
        p2 = strappend(prefix, "\t");
        prefix2 = p2 ? p2 : prefix;

        fprintf(f,
                "%s-> Unit %s:\n"
                "%s\tDescription: %s\n"
                "%s\tInstance: %s\n"
                "%s\tUnit Load State: %s\n"
                "%s\tUnit Active State: %s\n"
                "%s\tInactive Exit Timestamp: %s\n"
                "%s\tActive Enter Timestamp: %s\n"
                "%s\tActive Exit Timestamp: %s\n"
                "%s\tInactive Enter Timestamp: %s\n"
                "%s\tGC Check Good: %s\n"
                "%s\tNeed Daemon Reload: %s\n"
                "%s\tTransient: %s\n"
                "%s\tSlice: %s\n"
                "%s\tCGroup: %s\n"
                "%s\tCGroup realized: %s\n"
                "%s\tCGroup mask: 0x%x\n"
                "%s\tCGroup members mask: 0x%x\n",
                prefix, u->id,
                prefix, unit_description(u),
                prefix, strna(u->instance),
                prefix, unit_load_state_to_string(u->load_state),
                prefix, unit_active_state_to_string(unit_active_state(u)),
                prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->inactive_exit_timestamp.realtime)),
                prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->active_enter_timestamp.realtime)),
                prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->active_exit_timestamp.realtime)),
                prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->inactive_enter_timestamp.realtime)),
                prefix, yes_no(unit_check_gc(u)),
                prefix, yes_no(unit_need_daemon_reload(u)),
                prefix, yes_no(u->transient),
                prefix, strna(unit_slice_name(u)),
                prefix, strna(u->cgroup_path),
                prefix, yes_no(u->cgroup_realized),
                prefix, u->cgroup_mask,
                prefix, u->cgroup_members_mask);

        SET_FOREACH(t, u->names, i)
                fprintf(f, "%s\tName: %s\n", prefix, t);

        STRV_FOREACH(j, u->documentation)
                fprintf(f, "%s\tDocumentation: %s\n", prefix, *j);

        following = unit_following(u);
        if (following)
                fprintf(f, "%s\tFollowing: %s\n", prefix, following->id);

        r = unit_following_set(u, &following_set);
        if (r >= 0) {
                Unit *other;

                SET_FOREACH(other, following_set, i)
                        fprintf(f, "%s\tFollowing Set Member: %s\n", prefix, other->id);
        }

        if (u->fragment_path)
                fprintf(f, "%s\tFragment Path: %s\n", prefix, u->fragment_path);

        if (u->source_path)
                fprintf(f, "%s\tSource Path: %s\n", prefix, u->source_path);

        STRV_FOREACH(j, u->dropin_paths)
                fprintf(f, "%s\tDropIn Path: %s\n", prefix, *j);

        if (u->job_timeout > 0)
                fprintf(f, "%s\tJob Timeout: %s\n", prefix, format_timespan(timespan, sizeof(timespan), u->job_timeout, 0));

        condition_dump_list(u->conditions, f, prefix);

        if (dual_timestamp_is_set(&u->condition_timestamp))
                fprintf(f,
                        "%s\tCondition Timestamp: %s\n"
                        "%s\tCondition Result: %s\n",
                        prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->condition_timestamp.realtime)),
                        prefix, yes_no(u->condition_result));

        for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
                Unit *other;

                SET_FOREACH(other, u->dependencies[d], i)
                        fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->id);
        }

        if (!strv_isempty(u->requires_mounts_for)) {
                fprintf(f,
                        "%s\tRequiresMountsFor:", prefix);

                STRV_FOREACH(j, u->requires_mounts_for)
                        fprintf(f, " %s", *j);

                fputs("\n", f);
        }

        if (u->load_state == UNIT_LOADED) {

                fprintf(f,
                        "%s\tStopWhenUnneeded: %s\n"
                        "%s\tRefuseManualStart: %s\n"
                        "%s\tRefuseManualStop: %s\n"
                        "%s\tDefaultDependencies: %s\n"
                        "%s\tOnFailureJobMode: %s\n"
                        "%s\tIgnoreOnIsolate: %s\n"
                        "%s\tIgnoreOnSnapshot: %s\n",
                        prefix, yes_no(u->stop_when_unneeded),
                        prefix, yes_no(u->refuse_manual_start),
                        prefix, yes_no(u->refuse_manual_stop),
                        prefix, yes_no(u->default_dependencies),
                        prefix, job_mode_to_string(u->on_failure_job_mode),
                        prefix, yes_no(u->ignore_on_isolate),
                        prefix, yes_no(u->ignore_on_snapshot));

                if (UNIT_VTABLE(u)->dump)
                        UNIT_VTABLE(u)->dump(u, f, prefix2);

        } else if (u->load_state == UNIT_MERGED)
                fprintf(f,
                        "%s\tMerged into: %s\n",
                        prefix, u->merged_into->id);
        else if (u->load_state == UNIT_ERROR)
                fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror(-u->load_error));


        if (u->job)
                job_dump(u->job, f, prefix2);

        if (u->nop_job)
                job_dump(u->nop_job, f, prefix2);

}
Unknown