Userland: Move command-line utilities to Userland/Utilities/

2025-07-26 00:27:43 +00:00 · 2021-01-12 11:57:58 +01:00 · 2021-01-12 11:57:58 +01:00 · ececac65c2
commit ececac65c2
parent c4e2fd8123
142 changed files with 58 additions and 58 deletions
--- a/Userland/Utilities/sysctl.cpp
+++ b/Userland/Utilities/sysctl.cpp
@ -0,0 +1,134 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/ByteBuffer.h>
+#include <AK/String.h>
+#include <AK/StringBuilder.h>
+#include <AK/Vector.h>
+#include <LibCore/ArgsParser.h>
+#include <LibCore/DirIterator.h>
+#include <LibCore/File.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+static String read_var(const String& name)
+{
+    StringBuilder builder;
+    builder.append("/proc/sys/");
+    builder.append(name);
+    auto path = builder.to_string();
+    auto f = Core::File::construct(path);
+    if (!f->open(Core::IODevice::ReadOnly)) {
+        fprintf(stderr, "open: %s\n", f->error_string());
+        exit(1);
+    }
+    const auto& b = f->read_all();
+    if (f->error() < 0) {
+        fprintf(stderr, "read: %s\n", f->error_string());
+        exit(1);
+    }
+    return String((const char*)b.data(), b.size(), Chomp);
+}
+
+static void write_var(const String& name, const String& value)
+{
+    StringBuilder builder;
+    builder.append("/proc/sys/");
+    builder.append(name);
+    auto path = builder.to_string();
+    auto f = Core::File::construct(path);
+    if (!f->open(Core::IODevice::WriteOnly)) {
+        fprintf(stderr, "open: %s\n", f->error_string());
+        exit(1);
+    }
+    f->write(value);
+    if (f->error() < 0) {
+        fprintf(stderr, "write: %s\n", f->error_string());
+        exit(1);
+    }
+}
+
+static int handle_show_all()
+{
+    Core::DirIterator di("/proc/sys", Core::DirIterator::SkipDots);
+    if (di.has_error()) {
+        fprintf(stderr, "DirIterator: %s\n", di.error_string());
+        return 1;
+    }
+
+    while (di.has_next()) {
+        String variable_name = di.next_path();
+        printf("%s = %s\n", variable_name.characters(), read_var(variable_name).characters());
+    }
+    return 0;
+}
+
+static int handle_var(const String& var)
+{
+    String spec(var.characters(), Chomp);
+    auto parts = spec.split('=');
+    String variable_name = parts[0];
+    bool is_write = parts.size() > 1;
+
+    if (!is_write) {
+        printf("%s = %s\n", variable_name.characters(), read_var(variable_name).characters());
+        return 0;
+    }
+
+    printf("%s = %s", variable_name.characters(), read_var(variable_name).characters());
+    write_var(variable_name, parts[1]);
+    printf(" -> %s\n", read_var(variable_name).characters());
+    return 0;
+}
+
+int main(int argc, char** argv)
+{
+    bool show_all = false;
+    const char* var = nullptr;
+
+    Core::ArgsParser args_parser;
+    args_parser.set_general_help(
+        "Show or modify system-internal values. This requires root, and can crash your system.");
+    args_parser.add_option(show_all, "Show all variables", nullptr, 'a');
+    args_parser.add_positional_argument(var, "Command (var[=value])", "command", Core::ArgsParser::Required::No);
+    args_parser.parse(argc, argv);
+
+    if (var == nullptr) {
+        // Not supplied; assume `-a`.
+        show_all = true;
+    }
+
+    if (show_all) {
+        // Ignore `var`, even if it was supplied. Just like the real procps does.
+        return handle_show_all();
+    }
+
+    return handle_var(var);
+}