From c5e3b7b90141ddf0bd354e73946859f7f96ccaa3 Mon Sep 17 00:00:00 2001
From: Philippe Pittoli <karchnu@karchnu.fr>
Date: Mon, 16 Jan 2023 20:34:23 +0100
Subject: [PATCH] Binding example: works as expected (with c_allocator for
 now).

---
 zig-impl/drop/Makefile     |  6 +++++
 zig-impl/drop/src/main.c   | 23 +++++++++++++-----
 zig-impl/drop/src/main.zig | 48 ++++++++++++++++----------------------
 3 files changed, 43 insertions(+), 34 deletions(-)

diff --git a/zig-impl/drop/Makefile b/zig-impl/drop/Makefile
index 6b68f35..e7bbbff 100644
--- a/zig-impl/drop/Makefile
+++ b/zig-impl/drop/Makefile
@@ -30,3 +30,9 @@ zigcompilation: build.zig src/*.zig
 compilation: src/main.c
 	@echo the following compilation will produce errors despite actually working
 	$(CC) -o app -o main build/libipc.so $(CFLAGS) $^ $(LDFLAGS)
+
+run:
+	LD_LIBRARY_PATH=build ./main
+
+valgrind:
+	LD_LIBRARY_PATH=build valgrind --suppressions=./suppress-stuff.suppr --gen-suppressions=all -v --leak-check=full ./main
diff --git a/zig-impl/drop/src/main.c b/zig-impl/drop/src/main.c
index 690feb9..03ac160 100644
--- a/zig-impl/drop/src/main.c
+++ b/zig-impl/drop/src/main.c
@@ -1,13 +1,24 @@
 #include <stdio.h>
+#include <stdlib.h>
 
 int main(void) {
-	int ret = someipc(20,10);
-	printf("hello %d\n", ret);
+	int ret = 0;
 
-	void *somestructure = NULL;
-	some_struct_bidouillage_init(&somestructure);
-	int value = some_struct_bidouillage_update(&somestructure);
-	printf("value %d\n", value);
+	printf ("Init context.\n");
+	void *ctx = NULL;
+	ret = ipc_context_init (&ctx);
 
+	if (ret != 0) {
+		printf ("Cannot init context.\n");
+		return 1;
+	}
+
+	// TODO: do stuff
+
+	printf ("Deinit context\n");
+	ipc_context_deinit (ctx);
+	printf ("Context deinit.\n");
+	free(ctx);
+	printf ("Context completely freed.\n");
 	return 0;
 }
diff --git a/zig-impl/drop/src/main.zig b/zig-impl/drop/src/main.zig
index 9cf93f3..2fa8b1d 100644
--- a/zig-impl/drop/src/main.zig
+++ b/zig-impl/drop/src/main.zig
@@ -1,42 +1,34 @@
 const std = @import("std");
+const fmt = std.fmt;
+const heap = std.heap;
 const testing = std.testing;
 
 const print = std.debug.print;
 
-const SOMESTRUCT = packed struct {
-    somevalue: i32,
+pub const Context = struct {
+    rundir: [] u8,
     const Self = @This();
 
-    fn update(self: *Self) callconv(.C) i32 {
-        self.somevalue += 1;
-        return self.somevalue;
+    pub fn init() !Self {
+        var rundir = try std.heap.c_allocator.dupeZ(u8, "/tmp/libipc-run/");
+        return Self { .rundir = rundir };
+    }
+
+    pub fn deinit(self: *Self) void {
+        std.heap.c_allocator.free(self.rundir);
     }
 };
 
-export fn some_struct_bidouillage_init(ptr: *anyopaque) callconv(.C) void {
-    var pointer = @ptrCast(*SOMESTRUCT, @alignCast(@alignOf(SOMESTRUCT),ptr));
-    var somestruct = std.heap.c_allocator.create(SOMESTRUCT) catch null;
+export fn ipc_context_init (ptr: **Context) callconv(.C) i32 {
+    ptr.* = std.heap.c_allocator.create(Context) catch return 1;
 
-    print ("hello we just did something\n", .{});
-    if (somestruct) |s| {
-        s.somevalue = 2;
-        print ("just changed a value\n", .{});
-        pointer.* = s.*;
-    }
-    print ("hello again\n", .{});
-//    else {
-//        pointer.* = null;
-//    }
+    ptr.*.* = Context.init() catch |err| {
+        print ("libipc: error while init context: {}\n", .{err});
+        return 1;
+    };
+    return 0;
 }
 
-export fn some_struct_bidouillage_update(s: *SOMESTRUCT) callconv(.C) i32 {
-    return s.update();
-}
-
-export fn someipc(a: i32, b: i32) callconv(.C) i32 {
-    return a + b;
-}
-
-test "basic add functionality" {
-    try testing.expect(someipc(3, 7) == 10);
+export fn ipc_context_deinit (ctx: *Context) callconv(.C) void {
+    ctx.deinit();
 }