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/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2023, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/QuickSort.h>
#include <AK/String.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/ProcessStatisticsReader.h>
#include <LibCore/System.h>
#include <LibMain/Main.h>
#include <sys/sysmacros.h>
#include <unistd.h>
static ErrorOr<String> determine_tty_pseudo_name()
{
auto tty_stat = TRY(Core::System::fstat(STDIN_FILENO));
int tty_device_major = major(tty_stat.st_rdev);
int tty_device_minor = minor(tty_stat.st_rdev);
if (tty_device_major == 201) {
return String::formatted("pts:{}", tty_device_minor);
}
if (tty_device_major == 4) {
return String::formatted("tty:{}", tty_device_minor);
}
return "n/a"_short_string;
}
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
TRY(Core::System::pledge("stdio rpath tty"));
auto this_pseudo_tty_name = TRY(determine_tty_pseudo_name());
TRY(Core::System::pledge("stdio rpath"));
TRY(Core::System::unveil("/sys/kernel/processes", "r"));
TRY(Core::System::unveil("/etc/passwd", "r"));
TRY(Core::System::unveil(nullptr, nullptr));
enum class Alignment {
Left,
Right,
};
struct Column {
String title;
Alignment alignment { Alignment::Left };
int width { 0 };
String buffer;
};
bool every_process_flag = false;
bool every_terminal_process_flag = false;
bool full_format_flag = false;
StringView pid_list;
Core::ArgsParser args_parser;
args_parser.add_option(every_terminal_process_flag, "Show every process associated with terminals", nullptr, 'a');
args_parser.add_option(every_process_flag, "Show every process", nullptr, 'A');
args_parser.add_option(every_process_flag, "Show every process (Equivalent to -A)", nullptr, 'e');
args_parser.add_option(full_format_flag, "Full format", nullptr, 'f');
args_parser.add_option(pid_list, "A comma-separated list of PIDs. Only processes matching those PIDs will be selected", nullptr, 'q', "pid-list");
args_parser.parse(arguments);
Vector<Column> columns;
Optional<size_t> uid_column;
Optional<size_t> pid_column;
Optional<size_t> ppid_column;
Optional<size_t> pgid_column;
Optional<size_t> sid_column;
Optional<size_t> state_column;
Optional<size_t> tty_column;
Optional<size_t> cmd_column;
auto add_column = [&](auto title, auto alignment) {
columns.unchecked_append({ title, alignment, 0, {} });
return columns.size() - 1;
};
if (full_format_flag) {
TRY(columns.try_ensure_capacity(8));
uid_column = add_column("UID"_short_string, Alignment::Left);
pid_column = add_column("PID"_short_string, Alignment::Right);
ppid_column = add_column("PPID"_short_string, Alignment::Right);
pgid_column = add_column("PGID"_short_string, Alignment::Right);
sid_column = add_column("SID"_short_string, Alignment::Right);
state_column = add_column("STATE"_short_string, Alignment::Left);
tty_column = add_column("TTY"_short_string, Alignment::Left);
cmd_column = add_column("CMD"_short_string, Alignment::Left);
} else {
TRY(columns.try_ensure_capacity(3));
pid_column = add_column("PID"_short_string, Alignment::Right);
tty_column = add_column("TTY"_short_string, Alignment::Left);
cmd_column = add_column("CMD"_short_string, Alignment::Left);
}
auto all_processes = TRY(Core::ProcessStatisticsReader::get_all());
auto& processes = all_processes.processes;
if (!pid_list.is_empty()) {
every_process_flag = true;
auto string_parts = pid_list.split_view(',');
Vector<pid_t> selected_pids;
selected_pids.ensure_capacity(string_parts.size());
for (size_t i = 0; i < string_parts.size(); i++) {
auto pid = string_parts[i].to_int();
if (!pid.has_value()) {
warnln("Invalid value for -q: {}", pid_list);
warnln("Could not parse '{}' as a PID.", string_parts[i]);
return 1;
}
selected_pids.append(pid.value());
}
processes.remove_all_matching([&](auto& a) { return selected_pids.find(a.pid) == selected_pids.end(); });
auto processes_sort_predicate = [&selected_pids](auto& a, auto& b) {
return selected_pids.find_first_index(a.pid).value() < selected_pids.find_first_index(b.pid).value();
};
quick_sort(processes, processes_sort_predicate);
} else {
quick_sort(processes, [](auto& a, auto& b) { return a.pid < b.pid; });
}
Vector<Vector<String>> rows;
TRY(rows.try_ensure_capacity(1 + processes.size()));
Vector<String> header;
TRY(header.try_ensure_capacity(columns.size()));
for (auto& column : columns)
header.unchecked_append(column.title);
rows.unchecked_append(move(header));
for (auto const& process : processes) {
auto tty = TRY(String::from_deprecated_string(process.tty));
if (every_process_flag) {
// Don't skip any.
} else if (every_terminal_process_flag) {
if (tty.is_empty())
continue;
} else if (tty != this_pseudo_tty_name) {
continue;
}
Vector<String> row;
TRY(row.try_resize(columns.size()));
if (tty == "")
tty = "n/a"_short_string;
if (uid_column.has_value())
row[*uid_column] = TRY(String::from_deprecated_string(process.username));
if (pid_column.has_value())
row[*pid_column] = TRY(String::number(process.pid));
if (ppid_column.has_value())
row[*ppid_column] = TRY(String::number(process.ppid));
if (pgid_column.has_value())
row[*pgid_column] = TRY(String::number(process.pgid));
if (sid_column.has_value())
row[*sid_column] = TRY(String::number(process.sid));
if (tty_column.has_value())
row[*tty_column] = tty;
if (state_column.has_value())
row[*state_column] = process.threads.is_empty()
? "Zombie"_short_string
: TRY(String::from_deprecated_string(process.threads.first().state));
if (cmd_column.has_value())
row[*cmd_column] = TRY(String::from_deprecated_string(process.name));
rows.unchecked_append(move(row));
}
for (size_t i = 0; i < columns.size(); i++) {
auto& column = columns[i];
for (auto& row : rows)
column.width = max(column.width, static_cast<int>(row[i].code_points().length()));
}
for (auto& row : rows) {
for (size_t i = 0; i < columns.size(); i++) {
auto& column = columns[i];
auto& cell_text = row[i];
if (!column.width) {
out("{}", cell_text);
continue;
}
if (column.alignment == Alignment::Right)
out("{1:>{0}} ", column.width, cell_text);
else
out("{1:{0}} ", column.width, cell_text);
if (i != columns.size() - 1)
out(" ");
}
outln();
}
return 0;
}
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