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e2e7c4d574
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.
88 lines
2.5 KiB
C++
88 lines
2.5 KiB
C++
/*
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* Copyright (c) 2018-2020, 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/ByteString.h>
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#include <LibCore/ArgsParser.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 <stdio.h>
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#include <string.h>
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#include <unistd.h>
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struct Options {
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bool single_shot { false };
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Optional<pid_t> pid_to_omit;
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StringView process_name;
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StringView pid_separator { " "sv };
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};
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static ErrorOr<int> pid_of(Options const& options)
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{
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bool displayed_at_least_one = false;
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auto all_processes = TRY(Core::ProcessStatisticsReader::get_all());
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for (auto& it : all_processes.processes) {
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if (it.name != options.process_name || options.pid_to_omit == it.pid)
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continue;
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if (displayed_at_least_one)
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out("{}{}"sv, options.pid_separator, it.pid);
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else
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out("{}"sv, it.pid);
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displayed_at_least_one = true;
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if (options.single_shot)
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break;
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}
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if (displayed_at_least_one)
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outln();
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return 0;
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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("/sys/kernel/processes", "r"));
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TRY(Core::System::unveil("/etc/passwd", "r"));
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TRY(Core::System::unveil(nullptr, nullptr));
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Options options;
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Core::ArgsParser args_parser;
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args_parser.add_option(Core::ArgsParser::Option {
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.argument_mode = Core::ArgsParser::OptionArgumentMode::Required,
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.help_string = "Omit the given PID, or the parent process if the special value %PPID is passed",
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.short_name = 'o',
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.value_name = "pid",
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.accept_value = [&options](auto omit_pid_value) {
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if (omit_pid_value.is_empty())
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return false;
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if (omit_pid_value == "%PPID"sv) {
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options.pid_to_omit = getppid();
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return true;
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}
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auto number = omit_pid_value.template to_number<pid_t>();
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if (!number.has_value())
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return false;
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options.pid_to_omit = number.value();
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return true;
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},
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});
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args_parser.add_option(options.single_shot, "Only return one pid", nullptr, 's');
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args_parser.add_option(options.pid_separator, "Use `separator` to separate multiple pids", nullptr, 'S', "separator");
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args_parser.add_positional_argument(options.process_name, "Process name to search for", "process-name");
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args_parser.parse(args);
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return pid_of(options);
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}
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