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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.
82 lines
2.1 KiB
C++
82 lines
2.1 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/CharacterTypes.h>
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#include <AK/Optional.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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static void print_usage_and_exit()
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{
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warnln("usage: kill [-signal] <PID>");
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exit(1);
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}
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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TRY(Core::System::pledge("stdio proc"));
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int argc = arguments.argc;
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auto strings = arguments.strings;
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if (argc == 2 && strings[1] == "-l") {
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size_t valid_signal_count = 0;
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for (size_t i = 1; i < NSIG; ++i) {
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if (valid_signal_count && valid_signal_count % 5 == 0)
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outln("");
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auto const* signal_name = getsignalname(i);
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// This excludes SIGCANCEL, which is intended for internal use only
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if (!signal_name)
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continue;
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valid_signal_count++;
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out("{:2}) {:10}", i, signal_name);
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}
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outln("");
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return 0;
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}
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if (argc != 2 && argc != 3)
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print_usage_and_exit();
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unsigned signum = SIGTERM;
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int pid_argi = 1;
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if (argc == 3) {
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pid_argi = 2;
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if (strings[1][0] != '-')
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print_usage_and_exit();
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Optional<unsigned> number;
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if (is_ascii_alpha(strings[1][1])) {
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int value = getsignalbyname(&strings[1][1]);
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if (value > 0 && value < NSIG)
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number = value;
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}
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if (!number.has_value())
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number = strings[1].substring_view(1).to_number<unsigned>();
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if (!number.has_value()) {
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warnln("'{}' is not a valid signal name or number", &strings[1][1]);
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return 2;
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}
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signum = number.value();
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}
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auto pid_opt = strings[pid_argi].to_number<pid_t>();
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if (!pid_opt.has_value()) {
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warnln("'{}' is not a valid PID", strings[pid_argi]);
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return 3;
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}
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pid_t pid = pid_opt.value();
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TRY(Core::System::kill(pid, signum));
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return 0;
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}
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