mirror of
https://github.com/SerenityOS/serenity
synced 2024-07-22 02:26:11 +00:00
3f35ffb648
As `_string` can't fail anymore (since 3434412), there are no real
benefits to use the short variant in most cases.
117 lines
4.2 KiB
C++
117 lines
4.2 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2023, Tim Ledbetter <timledbetter@gmail.com>
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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 <AK/String.h>
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#include <AK/Time.h>
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#include <LibCore/Account.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/DateTime.h>
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#include <LibCore/File.h>
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#include <LibCore/ProcessStatisticsReader.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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#include <sys/sysmacros.h>
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static ErrorOr<String> tty_stat_to_pseudo_name(struct stat const& tty_stat)
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{
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int tty_device_major = major(tty_stat.st_rdev);
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int tty_device_minor = minor(tty_stat.st_rdev);
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if (tty_device_major == 201) {
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return String::formatted("pts:{}", tty_device_minor);
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}
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if (tty_device_major == 4) {
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return String::formatted("tty:{}", tty_device_minor);
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}
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return Error::from_string_literal("Unknown TTY device type");
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}
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ErrorOr<int> serenity_main(Main::Arguments args)
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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/group", "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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bool hide_header = false;
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StringView username_to_filter_by;
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Core::ArgsParser args_parser;
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args_parser.add_option(hide_header, "Don't show the header", "no-header", 'h');
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args_parser.add_positional_argument(username_to_filter_by, "Only show information about the specified user", "user", Core::ArgsParser::Required::No);
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args_parser.parse(args);
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auto file = TRY(Core::File::open("/var/run/utmp"sv, Core::File::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 = UnixDateTime::now().seconds_since_epoch();
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if (!hide_header)
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outln("\033[1m{:10} {:12} {:16} {:6} {}\033[0m", "USER", "TTY", "LOGIN@", "IDLE", "WHAT");
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TRY(json.as_object().try_for_each_member([&](auto& tty, auto& value) -> ErrorOr<void> {
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const JsonObject& entry = value.as_object();
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auto uid = entry.get_u32("uid"sv).value_or(0);
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[[maybe_unused]] auto pid = entry.get_i32("pid"sv).value_or(0);
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auto login_time = Core::DateTime::from_timestamp(entry.get_integer<time_t>("login_at"sv).value_or(0));
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auto login_at = TRY(login_time.to_string("%b%d %H:%M:%S"sv));
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auto maybe_account = Core::Account::from_uid(uid, Core::Account::Read::PasswdOnly);
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String username;
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if (!maybe_account.is_error())
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username = TRY(String::from_deprecated_string(maybe_account.release_value().username()));
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else
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username = TRY(String::formatted("{}", uid));
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if (!username_to_filter_by.is_empty() && username_to_filter_by != username)
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return {};
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StringBuilder builder;
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String idle_string = "n/a"_string;
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String what = "n/a"_string;
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StringView tty_display_name = tty;
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auto maybe_stat = Core::System::stat(tty);
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if (!maybe_stat.is_error()) {
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auto stat = maybe_stat.release_value();
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auto idle_time = now - stat.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 = TRY(builder.to_string());
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}
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auto tty_pseudo_name = TRY(tty_stat_to_pseudo_name(stat));
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tty_display_name = tty_pseudo_name;
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for (auto& process : process_statistics.processes) {
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if (tty_pseudo_name == process.tty.view() && process.pid == process.pgid) {
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what = TRY(String::from_deprecated_string(process.name));
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break;
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}
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}
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}
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outln("{:10} {:12} {:16} {:6} {}", username, tty_display_name, login_at, idle_string, what);
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return {};
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}));
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return 0;
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}
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