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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * Copyright (c) 2022, Karol Kosek <krkk@serenityos.org>
4 *
5 * SPDX-License-Identifier: BSD-2-Clause
6 */
7
8#include <AK/NumberFormat.h>
9#include <LibCore/File.h>
10#include <LibCore/System.h>
11#include <LibMain/Main.h>
12
13ErrorOr<int> serenity_main(Main::Arguments)
14{
15 TRY(Core::System::pledge("stdio rpath"));
16
17 auto file = TRY(Core::File::open("/sys/kernel/uptime"sv, Core::File::OpenMode::Read));
18
19 TRY(Core::System::pledge("stdio"));
20
21 Array<u8, BUFSIZ> buffer;
22 auto read_buffer = TRY(file->read_some(buffer));
23 auto maybe_seconds = AK::StringUtils::convert_to_uint(StringView(read_buffer));
24 if (!maybe_seconds.has_value())
25 return Error::from_string_literal("Couldn't convert to number");
26 auto seconds = maybe_seconds.release_value();
27
28 outln("Up {}", human_readable_time(seconds));
29 return 0;
30}