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