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Armin Friedl 2024-06-30 23:50:52 +02:00
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excuse you from the conditions of this License. If you cannot convey a
covered work so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you may
not convey it at all. For example, if you agree to terms that obligate you
to collect a royalty for further conveying from those to whom you convey
the Program, the only way you could satisfy both those terms and this
License would be to refrain entirely from conveying the Program.
13. Use with the GNU Affero General Public License.
Notwithstanding any other provision of this License, you have
permission to link or combine any covered work with a work licensed
under version 3 of the GNU Affero General Public License into a single
combined work, and to convey the resulting work. The terms of this
License will continue to apply to the part which is the covered work,
but the special requirements of the GNU Affero General Public License,
section 13, concerning interaction through a network will apply to the
combination as such.
14. Revised Versions of this License.
The Free Software Foundation may publish revised and/or new versions of
the GNU General Public License from time to time. Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.
Each version is given a distinguishing version number. If the
Program specifies that a certain numbered version of the GNU General
Public License "or any later version" applies to it, you have the
option of following the terms and conditions either of that numbered
version or of any later version published by the Free Software
Foundation. If the Program does not specify a version number of the
GNU General Public License, you may choose any version ever published
by the Free Software Foundation.
If the Program specifies that a proxy can decide which future
versions of the GNU General Public License can be used, that proxy's
public statement of acceptance of a version permanently authorizes you
to choose that version for the Program.
Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.
15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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const std = @import("std");
// Although this function looks imperative, note that its job is to
// declaratively construct a build graph that will be executed by an external
// runner.
pub fn build(b: *std.Build) void {
// Standard target options allows the person running `zig build` to choose
// what target to build for. Here we do not override the defaults, which
// means any target is allowed, and the default is native. Other options
// for restricting supported target set are available.
const target = b.standardTargetOptions(.{});
// Standard optimization options allow the person running `zig build` to select
// between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall. Here we do not
// set a preferred release mode, allowing the user to decide how to optimize.
const optimize = b.standardOptimizeOption(.{});
const relib = b.addStaticLibrary(.{
.name = "regex_slim",
.optimize = .Debug,
.target = target,
});
relib.addIncludePath(.{ .path = "lib" });
relib.addCSourceFile(.{
.file = b.path("lib/regex_slim.c")
});
relib.linkLibC();
const exe = b.addExecutable(.{
.name = "unclog",
.root_source_file = b.path("src/main.zig"),
.target = target,
.optimize = optimize,
.link_libc = true,
});
exe.addIncludePath(.{ .path = "lib" });
exe.linkLibC();
exe.linkLibrary(relib);
// This declares intent for the executable to be installed into the
// standard location when the user invokes the "install" step (the default
// step when running `zig build`).
b.installArtifact(exe);
// This *creates* a Run step in the build graph, to be executed when another
// step is evaluated that depends on it. The next line below will establish
// such a dependency.
const run_cmd = b.addRunArtifact(exe);
// By making the run step depend on the install step, it will be run from the
// installation directory rather than directly from within the cache directory.
// This is not necessary, however, if the application depends on other installed
// files, this ensures they will be present and in the expected location.
run_cmd.step.dependOn(b.getInstallStep());
// This allows the user to pass arguments to the application in the build
// command itself, like this: `zig build run -- arg1 arg2 etc`
if (b.args) |args| {
run_cmd.addArgs(args);
}
// This creates a build step. It will be visible in the `zig build --help` menu,
// and can be selected like this: `zig build run`
// This will evaluate the `run` step rather than the default, which is "install".
const run_step = b.step("run", "Run the app");
run_step.dependOn(&run_cmd.step);
// Creates a step for unit testing. This only builds the test executable
// but does not run it.
const procnet_unit_tests = b.addTest(.{
.root_source_file = b.path("src/procnet.zig"),
.target = target,
.optimize = optimize,
.link_libc = true,
});
procnet_unit_tests.addIncludePath(.{ .path = "lib" });
procnet_unit_tests.linkLibrary(relib);
const run_procnet_unit_tests = b.addRunArtifact(procnet_unit_tests);
run_procnet_unit_tests.has_side_effects = true; // needed so tests aren't cached
const exe_unit_tests = b.addTest(.{
.root_source_file = b.path("src/main.zig"),
.target = target,
.optimize = optimize,
.link_libc = true,
});
exe_unit_tests.addIncludePath(.{ .path = "lib" });
const run_exe_unit_tests = b.addRunArtifact(exe_unit_tests);
// Similar to creating the run step earlier, this exposes a `test` step to
// the `zig build --help` menu, providing a way for the user to request
// running the unit tests.
const test_step = b.step("test", "Run unit tests");
test_step.dependOn(&run_procnet_unit_tests.step);
test_step.dependOn(&run_exe_unit_tests.step);
}

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.{
// This is the default name used by packages depending on this one. For
// example, when a user runs `zig fetch --save <url>`, this field is used
// as the key in the `dependencies` table. Although the user can choose a
// different name, most users will stick with this provided value.
//
// It is redundant to include "zig" in this name because it is already
// within the Zig package namespace.
.name = "unclog",
// This is a [Semantic Version](https://semver.org/).
// In a future version of Zig it will be used for package deduplication.
.version = "0.0.0",
// This field is optional.
// This is currently advisory only; Zig does not yet do anything
// with this value.
//.minimum_zig_version = "0.11.0",
// This field is optional.
// Each dependency must either provide a `url` and `hash`, or a `path`.
// `zig build --fetch` can be used to fetch all dependencies of a package, recursively.
// Once all dependencies are fetched, `zig build` no longer requires
// internet connectivity.
.dependencies = .{
// See `zig fetch --save <url>` for a command-line interface for adding dependencies.
//.example = .{
// // When updating this field to a new URL, be sure to delete the corresponding
// // `hash`, otherwise you are communicating that you expect to find the old hash at
// // the new URL.
// .url = "https://example.com/foo.tar.gz",
//
// // This is computed from the file contents of the directory of files that is
// // obtained after fetching `url` and applying the inclusion rules given by
// // `paths`.
// //
// // This field is the source of truth; packages do not come from a `url`; they
// // come from a `hash`. `url` is just one of many possible mirrors for how to
// // obtain a package matching this `hash`.
// //
// // Uses the [multihash](https://multiformats.io/multihash/) format.
// .hash = "...",
//
// // When this is provided, the package is found in a directory relative to the
// // build root. In this case the package's hash is irrelevant and therefore not
// // computed. This field and `url` are mutually exclusive.
// .path = "foo",
// // When this is set to `true`, a package is declared to be lazily
// // fetched. This makes the dependency only get fetched if it is
// // actually used.
// .lazy = false,
//},
},
// Specifies the set of files and directories that are included in this package.
// Only files and directories listed here are included in the `hash` that
// is computed for this package. Only files listed here will remain on disk
// when using the zig package manager. As a rule of thumb, one should list
// files required for compilation plus any license(s).
// Paths are relative to the build root. Use the empty string (`""`) to refer to
// the build root itself.
// A directory listed here means that all files within, recursively, are included.
.paths = .{
"build.zig",
"build.zig.zon",
"src",
// For example...
//"LICENSE",
//"README.md",
},
}

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#include "regex_slim.h"
regex_t* alloc_regex_t(void) {
return (regex_t*)malloc(sizeof(regex_t));
}
void free_regex_t(regex_t* ptr) {
free(ptr);
}

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// Workaround for using regex in Zig.
// https://www.openmymind.net/Regular-Expressions-in-Zig/
// https://stackoverflow.com/questions/73086494/how-to-allocate-a-struct-of-incomplete-type-in-zig
#include <regex.h>
#include <stdlib.h>
regex_t* alloc_regex_t(void);
void free_regex_t(regex_t* ptr);

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const std = @import("std");
const proc = @import("procnet.zig");
const pid = @import("procpid.zig");
const c = @cImport({
@cInclude("arpa/inet.h");
});
pub const std_options = .{
.log_level = .err
};
pub fn main() !void {
var argsit = std.process.args();
_ = argsit.next() orelse return error.Args;
const port = try std.fmt.parseInt(u16, argsit.next().?, 10);
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
defer _ = gpa.deinit();
const alloc = gpa.allocator();
var clogged = false;
var procs = std.ArrayList(pid.Process).init(alloc);
defer procs.deinit();
const tcp = try proc.read_proc_net(alloc, .V4, "/proc/net/tcp");
defer alloc.free(tcp);
for(tcp) |pn| {
if(pn.V4.port == port) {
clogged = true;
try print_proc_net(&pn, "TCP/IPv4");
try append_processes(alloc, pn.V4.inode, &procs);
}
}
const tcp6 = try proc.read_proc_net(alloc, .V6, "/proc/net/tcp6");
defer alloc.free(tcp6);
for(tcp6) |pn| {
if(pn.V6.port == port) {
clogged = true;
try print_proc_net(&pn, "TCP/IPv6");
try append_processes(alloc, pn.V6.inode, &procs);
}
}
const udp = try proc.read_proc_net(alloc, .V4, "/proc/net/udp");
defer alloc.free(udp);
for(udp) |pn| {
if(pn.V4.port == port) {
clogged = true;
try print_proc_net(&pn, "UDP/IPv4");
try append_processes(alloc, pn.V4.inode, &procs);
}
}
const udp6 = try proc.read_proc_net(alloc, .V6, "/proc/net/udp6");
defer alloc.free(udp6);
for(udp6) |pn| {
if(pn.V6.port == port) {
clogged = true;
try print_proc_net(&pn, "UDP/IPv6");
try append_processes(alloc, pn.V6.inode, &procs);
}
}
if(!clogged){
try std.io.getStdOut().writer().print("Port {d} looks unclogged already\n", .{port});
}
}
fn append_processes(alloc: std.mem.Allocator, inode: u32, buf: *std.ArrayList(pid.Process)) !void {
const pids = try pid.find_proc(alloc, inode);
defer alloc.free(pids);
try std.io.getStdOut().writer().print("\t{s: <10}{s: <20}{s}\n", .{"PID", "CMD", "ARGS"});
for(pids) |p| {
const process = try pid.resolve_process(alloc, p);
defer process.deinit();
try buf.append(process);
const cmdline = try std.mem.join(alloc, " ", process.cmdline[1..]);
defer alloc.free(cmdline);
try std.io.getStdOut().writer().print("\t{d: <10}{s: <20}{s}\n", .{process.proc_pid.pid, process.comm[0..process.comm.len-1], cmdline});
}
_ = try std.io.getStdOut().writer().write("\n");
}
fn print_proc_net(entry: *const proc.ProcNet, addr_type: []const u8) !void {
var stdio = std.io.getStdOut();
switch(entry.*) {
.V4 => |v4| {
const src_addr_pp = c.inet_ntoa(.{.s_addr = v4.addr}); // allocates static global buffer, don't free
try stdio.writer().print("Port {d} clogged on {s} Address {s} with socket inode {d}\n",
.{v4.port, addr_type, src_addr_pp, v4.inode});
},
.V6 => |v6| {
try stdio.writer().print("Port {d} clogged on {s} Address ", .{v6.port, addr_type});
for(@as(*const [16]u8, @ptrCast(&v6.addr)), 0..) |h, idx| {
if(idx % 2 == 0 and idx != 0) {
_ = try stdio.writer().write(":");
}
try stdio.writer().print("{X:0<2}", .{h});
}
try stdio.writer().print(" with socket inode {d}\n", .{v6.inode});
},
}
}

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const std = @import("std");
const log = std.log;
const testing = std.testing;
const Allocator = std.mem.Allocator;
const c = @cImport({
@cInclude("arpa/inet.h");
});
pub const ProcNet = union(enum) {
V4: struct {
addr: u32,
port: u16,
inode: u32
},
V6: struct {
addr: u128,
port: u16,
inode: u32
},
pub fn format(value: @This(), comptime _: []const u8, _: std.fmt.FormatOptions, writer: anytype) !void {
switch(value) {
.V4 => |v4| {
const src_addr_pp = c.inet_ntoa(.{.s_addr = v4.addr}); // allocates static global buffer, don't free
try writer.print("{s: <15}{d: <10}{d}", .{src_addr_pp, v4.port, v4.inode});
},
.V6 => |v6| {
for(@as(*const [16]u8, @ptrCast(&v6.addr)), 0..) |h, idx| {
if(idx % 2 == 0 and idx != 0) {
_ = try writer.write(":");
}
try writer.print("{X:0<2}", .{h});
}
try writer.print("\t{d: <10}{d}", .{v6.port, v6.inode});
},
.RAW => |raw| {
try writer.print("{d} {d}", .{raw.port, raw.inode});
}
}
}
};
pub fn read_proc_net(alloc: Allocator, comptime addr_len: enum{V4, V6}, path: []const u8) ![]ProcNet {
var arena = std.heap.ArenaAllocator.init(alloc);
defer arena.deinit();
const proc_net_parsed: [][3][]u8 = try parse_proc_net(arena.allocator(), path);
var buf = try std.ArrayList(ProcNet).initCapacity(alloc, proc_net_parsed.len);
defer buf.deinit();
const addr_len_t = switch(addr_len){.V4 => u32, .V6 => u128};
for(proc_net_parsed) |line| {
const src_addr = try std.fmt.parseUnsigned(addr_len_t, line[0], 16);
const src_port = try std.fmt.parseUnsigned(u16, line[1], 16);
const inode = try std.fmt.parseUnsigned(u32, line[2], 10);
try buf.append(
switch(addr_len) {
.V4 => ProcNet{.V4 = .{.addr = src_addr, .port = src_port, .inode = inode}},
.V6 => ProcNet{.V6 = .{.addr = src_addr, .port = src_port, .inode = inode}},
}
);
}
return buf.toOwnedSlice();
}
fn parse_proc_net(alloc: Allocator, path: []const u8) ![][3][]u8 {
var proc_net_file = try std.fs.openFileAbsolute(path, .{});
defer proc_net_file.close();
var buf_reader = std.io.bufferedReader(proc_net_file.reader());
var reader = buf_reader.reader();
try reader.skipUntilDelimiterOrEof('\n'); // skip header
// allocates caller-owned memory
var res = std.ArrayList([3][]u8).init(alloc);
defer res.deinit();
// used for internal allocations, owned
var arena = std.heap.ArenaAllocator.init(alloc);
defer arena.deinit();
while(try reader.readUntilDelimiterOrEofAlloc(arena.allocator(), '\n', 256)) |line| {
var tokens = std.ArrayList([]const u8).init(arena.allocator()); // buffer for a line in the proc file split by tokenizer
defer tokens.deinit();
var tokenizer = std.mem.tokenize(u8, line, " \t\n");
while(tokenizer.next()) |elem| { try tokens.append(elem); }
var src_it = std.mem.splitScalar(u8, tokens.items[1], ':');
try res.append(
.{
try alloc.dupe(u8, src_it.next().?),
try alloc.dupe(u8, src_it.next().?),
try alloc.dupe(u8, tokens.items[9])
}
);
}
return res.toOwnedSlice();
}
// test "basic 2" {
// std.testing.log_level = .info;
// const alloc = std.testing.allocator;
// try read_proc_net(alloc);
// }
test "basic 3" {
std.testing.log_level = .info;
const alloc = std.testing.allocator;
var arena = std.heap.ArenaAllocator.init(alloc);
defer arena.deinit();
const res = try parse_proc_net(arena.allocator(), "/proc/net/tcp");
for(res) |line| {
for(line) |field| {
std.debug.print("{s}\t", .{field});
}
std.debug.print("\n", .{});
}
}
test "basic 4" {
std.testing.log_level = .info;
const alloc = std.testing.allocator;
var arena = std.heap.ArenaAllocator.init(alloc);
defer arena.deinit();
const res = try read_proc_net(arena.allocator(), .V4, "/proc/net/tcp");
for(res) |pn| {
std.debug.print("{any}\n", .{pn});
}
}
test "basic 5" {
std.testing.log_level = .info;
const alloc = std.testing.allocator;
var arena = std.heap.ArenaAllocator.init(alloc);
defer arena.deinit();
const res = try read_proc_net(arena.allocator(), .V6, "/proc/net/tcp6");
for(res) |pn| {
std.debug.print("{any}\n", .{pn});
}
}
test "basic 6" {
std.testing.log_level = .info;
const alloc = std.testing.allocator;
var arena = std.heap.ArenaAllocator.init(alloc);
defer arena.deinit();
const res = try read_proc_net(arena.allocator(), .V4, "/proc/net/udp");
for(res) |pn| {
std.debug.print("{any}\n", .{pn});
}
}
test "basic 7" {
std.testing.log_level = .info;
const alloc = std.testing.allocator;
var arena = std.heap.ArenaAllocator.init(alloc);
defer arena.deinit();
const res = try read_proc_net(arena.allocator(), .V6, "/proc/net/udp6");
for(res) |pn| {
std.debug.print("{any}\n", .{pn});
}
}

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const std = @import("std");
const log = std.log;
const testing = std.testing;
const Allocator = std.mem.Allocator;
const c = @cImport({
@cInclude("regex.h");
@cInclude("regex_slim.h");
});
pub const ProcPid = struct {
pid: u32,
inode: u32,
fd: u32,
};
pub const Process = struct {
proc_pid: ProcPid,
comm: []u8,
cmdline: [][]u8,
alloc: std.heap.ArenaAllocator,
pub fn deinit(self: @This()) void {
self.alloc.deinit();
}
};
pub fn find_proc(alloc: Allocator, inode: u32) ![]ProcPid {
var proc_dir = try std.fs.openDirAbsolute("/proc", .{ .iterate = true });
defer proc_dir.close();
const regex_t = c.alloc_regex_t() orelse {
log.err("Could not allocate regex_t memory", .{});
return error.RegexAllocFailed;
};
defer c.free_regex_t(regex_t);
if (c.regcomp(regex_t, "^[0-9]\\{1,\\}/fd/[0-9]\\{1,\\}$", c.REG_NOSUB) != 0) {
return error.REGCOMP;
}
var walker = try proc_dir.walk(alloc);
defer walker.deinit();
var buf = std.ArrayList(ProcPid).init(alloc);
defer buf.deinit();
while (true) {
const entry = walker.next() catch |err| switch (err) {
error.AccessDenied => continue,
else => return err,
} orelse {
log.info("No more entry. Exiting.", .{});
break;
};
if (c.regexec(regex_t, entry.path, 0, null, 0) == 0) {
const stat = proc_dir.statFile(entry.path) catch |err| switch(err) {
error.AccessDenied => continue,
else => return err
};
if(stat.kind == .unix_domain_socket) {
if(stat.inode == inode) {
log.info("Found procpid path {s}", .{entry.path});
// <pid>/fd/<fd>
var compit = try std.fs.path.componentIterator(entry.path);
const pid = try std.fmt.parseInt(u32, compit.next().?.name, 10); // parse <pid>
_ = compit.next().?.name; // skip /fd/
const fd = try std.fmt.parseInt(u32, compit.next().?.name, 10); // parse <fd>
try buf.append(ProcPid{
.pid = pid,
.inode = inode,
.fd = fd
});
}
}
}
}
return buf.toOwnedSlice();
}
pub fn resolve_process(alloc: Allocator, proc_pid: ProcPid) !Process {
var fmt_buf = [_]u8{0}**20;
const path = try std.fmt.bufPrint(&fmt_buf, "/proc/{d}", .{proc_pid.pid});
const proc_dir = try std.fs.openDirAbsolute(path, .{});
var arena_alloc = std.heap.ArenaAllocator.init(alloc);
const comm_file = try proc_dir.openFile("comm", .{});
const comm = try comm_file.reader().readAllAlloc(arena_alloc.allocator(), 4096);
const cmdline_file = try proc_dir.openFile("cmdline", .{});
const cmdline_raw = try cmdline_file.reader().readAllAlloc(alloc, 4096);
defer alloc.free(cmdline_raw);
var cmdline_it = std.mem.splitScalar(u8, cmdline_raw, 0x0);
var cmdline_buf = std.ArrayList([]u8).init(arena_alloc.allocator());
defer cmdline_buf.deinit();
while(cmdline_it.next()) |cmdline_elem| {
try cmdline_buf.append(try arena_alloc.allocator().dupe(u8, cmdline_elem));
}
return Process{
.proc_pid = proc_pid,
.comm = comm,
.cmdline = try cmdline_buf.toOwnedSlice(),
.alloc = arena_alloc
};
}