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77 lines
2.6 KiB
C++
77 lines
2.6 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/JsonObject.h>
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#include <AK/JsonValue.h>
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#include <LibCore/DateTime.h>
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#include <LibCore/ProcessStatisticsReader.h>
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#include <LibCore/Stream.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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#include <pwd.h>
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#include <sys/stat.h>
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#include <time.h>
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ErrorOr<int> serenity_main(Main::Arguments)
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{
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TRY(Core::System::pledge("stdio rpath"));
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TRY(Core::System::unveil("/dev", "r"));
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TRY(Core::System::unveil("/etc/passwd", "r"));
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TRY(Core::System::unveil("/etc/timezone", "r"));
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TRY(Core::System::unveil("/var/run/utmp", "r"));
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TRY(Core::System::unveil("/sys/kernel/processes", "r"));
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TRY(Core::System::unveil(nullptr, nullptr));
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auto file = TRY(Core::Stream::File::open("/var/run/utmp"sv, Core::Stream::OpenMode::Read));
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auto file_contents = TRY(file->read_until_eof());
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auto json = TRY(JsonValue::from_string(file_contents));
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if (!json.is_object()) {
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warnln("Error: Could not parse /var/run/utmp");
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return 1;
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}
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auto process_statistics = TRY(Core::ProcessStatisticsReader::get_all());
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auto now = time(nullptr);
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outln("\033[1m{:10} {:12} {:16} {:6} {}\033[0m", "USER", "TTY", "LOGIN@", "IDLE", "WHAT");
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json.as_object().for_each_member([&](auto& tty, auto& value) {
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const JsonObject& entry = value.as_object();
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auto uid = entry.get_deprecated("uid"sv).to_u32();
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[[maybe_unused]] auto pid = entry.get_deprecated("pid"sv).to_i32();
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auto login_time = Core::DateTime::from_timestamp(entry.get_deprecated("login_at"sv).to_number<time_t>());
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auto login_at = login_time.to_deprecated_string("%b%d %H:%M:%S"sv);
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auto* pw = getpwuid(uid);
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DeprecatedString username;
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if (pw)
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username = pw->pw_name;
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else
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username = DeprecatedString::number(uid);
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StringBuilder builder;
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DeprecatedString idle_string = "n/a";
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struct stat st;
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if (stat(tty.characters(), &st) == 0) {
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auto idle_time = now - st.st_mtime;
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if (idle_time >= 0) {
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builder.appendff("{}s", idle_time);
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idle_string = builder.to_deprecated_string();
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}
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}
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DeprecatedString what = "n/a";
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for (auto& process : process_statistics.processes) {
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if (process.tty == tty && process.pid == process.pgid)
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what = process.name;
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}
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outln("{:10} {:12} {:16} {:6} {}", username, tty, login_at, idle_string, what);
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});
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return 0;
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}
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