mirror of
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105 lines
2.7 KiB
C++
105 lines
2.7 KiB
C++
#include <stdio.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <errno.h>
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#include <string.h>
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#include <fcntl.h>
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#include <AK/AKString.h>
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#include <AK/StringBuilder.h>
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#include <AK/Vector.h>
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#include <LibCore/CArgsParser.h>
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#include <LibCore/CDirIterator.h>
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#include <LibCore/CFile.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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CFile f(path);
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if (!f.open(CIODevice::ReadOnly)) {
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fprintf(stderr, "open: %s", 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", f.error_string());
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exit(1);
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}
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return String((const char*)b.pointer(), 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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CFile f(path);
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if (!f.open(CIODevice::WriteOnly)) {
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fprintf(stderr, "open: %s", 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", 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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CDirIterator di("/proc/sys", CDirIterator::SkipDots);
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if (di.has_error()) {
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fprintf(stderr, "CDirIterator: %s\n", di.error_string());
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return 1;
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}
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char pathbuf[PATH_MAX];
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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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CArgsParser args_parser("sysctl");
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args_parser.add_arg("a", "show all variables");
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args_parser.add_single_value("variable=[value]");
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CArgsParserResult args = args_parser.parse(argc, (const char**)argv);
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if (args.is_present("a")) {
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return handle_show_all();
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} else if (args.get_single_values().size() != 1) {
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args_parser.print_usage();
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return 0;
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}
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Vector<String> values = args.get_single_values();
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return handle_var(values[0]);
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}
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