Introduce deinitIfLive utility and integrate enhanced memory management

src/main.zig

@@ -1,3 +1,8 @@
+//! Entry point for the zocket daemon.
+//!
+//! Handles allocator selection (debug-checked vs. release), CLI argument
+//! parsing, and configuration path resolution before handing off to `run`.
+
 const zocket = @import("zocket");
 
 const std     = @import("std");
@@ -7,6 +12,14 @@ const options = @import("build_options");
 
 const args = zocket.deps.args;
 
+// TODO: switch vars/consts/params to snake_case
+
+/// Resolves the config path, then delegates to `run`.
+///
+/// Allocator strategy:
+/// - Debug builds use `DebugAllocator`, which tracks every allocation and
+///   panics/exits on leaks or double-frees.
+/// - Release builds use `c_allocator` for C ABI interop.
 pub fn main(init: std.process.Init) !void
 {
     const debug = builtin.mode == .Debug;
@@ -21,10 +34,13 @@ pub fn main(init: std.process.Init) !void
 
     const allocator = if (debug) gpa.allocator() else std.heap.c_allocator;
 
-    var tmpArena       = std.heap.ArenaAllocator.init(std.heap.c_allocator);
-    const tmpAllocator = tmpArena.allocator();
+    var tmp_arena       = std.heap.ArenaAllocator.init(allocator);
+    var arena_live = true;
 
-    var parser = try args.ArgumentParser.init(tmpAllocator, .{
+    const tmp_allocator = tmp_arena.allocator();
+    errdefer zocket.memory.deinitIfLive(&tmp_arena, &arena_live);
+
+    var parser = try args.ArgumentParser.init(tmp_allocator, .{
         .name        = "zocket",
         .version     = options.version,
         .description = "A lightweight Zig WebSocket server and mesh routing daemon.",
@@ -39,23 +55,30 @@ pub fn main(init: std.process.Init) !void
 
     const path = if (debug) path:
     {
-        const tmpPath = result.getString("path") orelse "config/config.toml";
-        break :path try allocator.dupe(u8, tmpPath);
+        const tmp_path = result.getString("path") orelse "config/config.toml";
+        break :path try allocator.dupe(u8, tmp_path);
     }
     else path:
     {
-        const tmpPath = result.getString("path") orelse blk: {
-            const exe = try std.process.executableDirPathAlloc(io, tmpAllocator);
-            break :blk  try std.Io.Dir.path.join(tmpAllocator, &.{ exe, "config/config.toml" });
+        const tmp_path = result.getString("path") orelse blk: {
+            const exe = try std.process.executableDirPathAlloc(io, tmp_allocator);
+            break :blk  try std.Io.Dir.path.join(tmp_allocator, &.{ exe, "config/config.toml" });
         };
-        break :path try allocator.dupe(u8, tmpPath);
+        break :path try allocator.dupe(u8, tmp_path);
     };
 
-    tmpArena.deinit();
+    zocket.memory.deinitIfLive(&tmp_arena, &arena_live);
 
     try run(io, allocator, path);
 }
 
+/// Loads and parses the configuration file at `path`, then hands off to
+/// the rest of the application.
+///
+/// Owns `path` and frees it once it's no longer needed; Callers must not free `path` themselves!
+///
+/// On parse failure, logs a human-readable reason and terminates the
+/// process immediately via `std.process.exit`.
 fn run(io: std.Io, allocator: std.mem.Allocator, path: []const u8) !void
 {
     const parsed = zocket.config.parse(io, allocator, path) catch |err|

src/memory/util.zig

@@ -0,0 +1,27 @@
+const std = @import("std");
+
+/// Deinitializes `allocator` only if it is still live.
+///
+/// Pass a pointer to the original allocator owner, such as an
+/// `ArenaAllocator` or `DebugAllocator`.
+///
+/// If `live` is `true`, calls `allocator.deinit()` and then sets
+/// `live` to `false`, preventing a later cleanup path from attempting
+/// to deinitialize the same allocator again.
+///
+/// The return value of `deinit()` is discarded.
+pub fn deinitIfLive(allocator: anytype, live: *bool) void
+{
+    comptime
+    {
+        const T = @TypeOf(allocator);
+
+        if (@typeInfo(T) != .pointer) @compileError("deinitIfLive expects a pointer!");
+        if (T == std.mem.Allocator)   @compileError("deinitIfLive expects a pointer to an allocator owner, not std.mem.Allocator!");
+    }
+
+    if (live.*) {
+        _ = allocator.deinit();
+        live.* = false;
+    }
+}

src/root.zig

@@ -4,7 +4,9 @@ pub const deps = struct {
 
 
 pub const config = @import("config/config.zig");
+pub const memory = @import("memory/util.zig");
 
 test {
     _ = config;
+    _ = memory;
 }