mirror of
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114 lines
3.1 KiB
C++
114 lines
3.1 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/ByteBuffer.h>
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#include <AK/String.h>
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#include <AK/StringBuilder.h>
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#include <AK/Vector.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/DirIterator.h>
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#include <LibCore/File.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.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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static String read_var(const String& name)
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{
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StringBuilder builder;
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builder.append("/proc/sys/");
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builder.append(name);
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auto path = builder.to_string();
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auto f = Core::File::construct(path);
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if (!f->open(Core::OpenMode::ReadOnly)) {
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fprintf(stderr, "open: %s\n", f->error_string());
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exit(1);
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}
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const auto& b = f->read_all();
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if (f->error() < 0) {
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fprintf(stderr, "read: %s\n", f->error_string());
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exit(1);
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}
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return String((const char*)b.data(), b.size(), Chomp);
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}
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static void write_var(const String& name, const String& value)
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{
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StringBuilder builder;
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builder.append("/proc/sys/");
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builder.append(name);
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auto path = builder.to_string();
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auto f = Core::File::construct(path);
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if (!f->open(Core::OpenMode::WriteOnly)) {
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fprintf(stderr, "open: %s\n", f->error_string());
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exit(1);
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}
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f->write(value);
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if (f->error() < 0) {
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fprintf(stderr, "write: %s\n", f->error_string());
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exit(1);
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}
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}
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static int handle_show_all()
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{
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Core::DirIterator di("/proc/sys", Core::DirIterator::SkipDots);
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if (di.has_error()) {
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fprintf(stderr, "DirIterator: %s\n", di.error_string());
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return 1;
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}
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while (di.has_next()) {
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String variable_name = di.next_path();
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printf("%s = %s\n", variable_name.characters(), read_var(variable_name).characters());
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}
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return 0;
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}
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static int handle_var(const String& var)
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{
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String spec(var.characters(), Chomp);
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auto parts = spec.split('=');
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String variable_name = parts[0];
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bool is_write = parts.size() > 1;
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if (!is_write) {
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printf("%s = %s\n", variable_name.characters(), read_var(variable_name).characters());
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return 0;
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}
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printf("%s = %s", variable_name.characters(), read_var(variable_name).characters());
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write_var(variable_name, parts[1]);
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printf(" -> %s\n", read_var(variable_name).characters());
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return 0;
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}
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int main(int argc, char** argv)
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{
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bool show_all = false;
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const char* var = nullptr;
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Core::ArgsParser args_parser;
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args_parser.set_general_help(
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"Show or modify system-internal values. This requires root, and can crash your system.");
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args_parser.add_option(show_all, "Show all variables", nullptr, 'a');
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args_parser.add_positional_argument(var, "variable[=value]", "variable", Core::ArgsParser::Required::No);
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args_parser.parse(argc, argv);
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if (var == nullptr) {
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// Not supplied; assume `-a`.
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show_all = true;
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}
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if (show_all) {
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// Ignore `var`, even if it was supplied. Just like the real procps does.
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return handle_show_all();
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}
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return handle_var(var);
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}
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