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https://github.com/LadybirdBrowser/ladybird.git
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7e77a2ec40
As threads come and go, we can't simply account for how many time slices the threads at any given point may have been using. We need to also account for threads that have since disappeared. This means we also need to track how many time slices we have expired globally. However, because this doesn't account for context switches outside of the system timer tick values may still be under-reported. To solve this we will need to track more accurate time information on each context switch. This also fixes top's cpu usage calculation which was still based on the number of context switches. Fixes #6473
105 lines
2.8 KiB
C++
105 lines
2.8 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/ByteBuffer.h>
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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/File.h>
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#include <LibCore/ProcessStatisticsReader.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <time.h>
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int main()
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{
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if (pledge("stdio rpath", nullptr) < 0) {
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perror("pledge");
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return 1;
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}
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if (unveil("/dev", "r") < 0) {
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perror("unveil");
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return 1;
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}
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if (unveil("/etc/passwd", "r") < 0) {
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perror("unveil");
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return 1;
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}
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if (unveil("/var/run/utmp", "r") < 0) {
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perror("unveil");
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return 1;
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}
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if (unveil("/proc", "r") < 0) {
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perror("unveil");
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return 1;
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}
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unveil(nullptr, nullptr);
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auto file_or_error = Core::File::open("/var/run/utmp", Core::OpenMode::ReadOnly);
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if (file_or_error.is_error()) {
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warnln("Error: {}", file_or_error.error());
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return 1;
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}
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auto& file = *file_or_error.value();
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auto json = JsonValue::from_string(file.read_all());
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if (!json.has_value() || !json.value().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 = Core::ProcessStatisticsReader::get_all();
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if (!process_statistics.has_value()) {
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warnln("Error: Could not get process statistics");
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return 1;
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}
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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.value().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("uid").to_u32();
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[[maybe_unused]] auto pid = entry.get("pid").to_i32();
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auto login_time = Core::DateTime::from_timestamp(entry.get("login_at").to_number<time_t>());
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auto login_at = login_time.to_string("%b%d %H:%M:%S");
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auto* pw = getpwuid(uid);
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String 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 = String::number(uid);
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StringBuilder builder;
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String 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_string();
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}
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}
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String what = "n/a";
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for (auto& process : process_statistics.value().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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