ladybird/Userland/Utilities/pidof.cpp
Shannon Booth e2e7c4d574 Everywhere: Use to_number<T> instead of to_{int,uint,float,double}
In a bunch of cases, this actually ends up simplifying the code as
to_number will handle something such as:

```
Optional<I> opt;
if constexpr (IsSigned<I>)
    opt = view.to_int<I>();
else
    opt = view.to_uint<I>();
```

For us.

The main goal here however is to have a single generic number conversion
API between all of the String classes.
2023-12-23 20:41:07 +01:00

89 lines
2.5 KiB
C++

/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/ByteString.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/ProcessStatisticsReader.h>
#include <LibCore/System.h>
#include <LibMain/Main.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
struct Options {
bool single_shot { false };
Optional<pid_t> pid_to_omit;
StringView process_name;
StringView pid_separator { " "sv };
};
static ErrorOr<int> pid_of(Options const& options)
{
bool displayed_at_least_one = false;
auto all_processes = TRY(Core::ProcessStatisticsReader::get_all());
for (auto& it : all_processes.processes) {
if (it.name != options.process_name || options.pid_to_omit == it.pid)
continue;
if (displayed_at_least_one)
out("{}{}"sv, options.pid_separator, it.pid);
else
out("{}"sv, it.pid);
displayed_at_least_one = true;
if (options.single_shot)
break;
}
if (displayed_at_least_one)
outln();
return 0;
}
ErrorOr<int> serenity_main(Main::Arguments args)
{
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));
Options options;
Core::ArgsParser args_parser;
args_parser.add_option(Core::ArgsParser::Option {
.argument_mode = Core::ArgsParser::OptionArgumentMode::Required,
.help_string = "Omit the given PID, or the parent process if the special value %PPID is passed",
.short_name = 'o',
.value_name = "pid",
.accept_value = [&options](auto omit_pid_value) {
if (omit_pid_value.is_empty())
return false;
if (omit_pid_value == "%PPID"sv) {
options.pid_to_omit = getppid();
return true;
}
auto number = omit_pid_value.template to_number<pid_t>();
if (!number.has_value())
return false;
options.pid_to_omit = number.value();
return true;
},
});
args_parser.add_option(options.single_shot, "Only return one pid", nullptr, 's');
args_parser.add_option(options.pid_separator, "Use `separator` to separate multiple pids", nullptr, 'S', "separator");
args_parser.add_positional_argument(options.process_name, "Process name to search for", "process-name");
args_parser.parse(args);
return pid_of(options);
}