From 7865085c4477c0233cf07519af2b217365567a66 Mon Sep 17 00:00:00 2001
From: zy <zhangyang@geedgenetworks.com>
Date: Fri, 8 Sep 2023 03:48:44 +0000
Subject: ffi hello world

---
 .devcontainer/devcontainer.json | 35 +++++++++++++++++++++++++++++++++++
 .gitignore                      |  1 +
 Cargo.lock                      | 26 ++++++++++++++++++++++++++
 Cargo.toml                      | 13 +++++++++++++
 build.rs                        |  3 +++
 sample.c                        |  3 +++
 src/main.rs                     | 11 +++++++++++
 7 files changed, 92 insertions(+)
 create mode 100644 .devcontainer/devcontainer.json
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 build.rs
 create mode 100644 sample.c
 create mode 100644 src/main.rs

diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
new file mode 100644
index 0000000..b9f3ab8
--- /dev/null
+++ b/.devcontainer/devcontainer.json
@@ -0,0 +1,35 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/rust
+{
+	"name": "ffi_demo",
+	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+	// "image": "mcr.microsoft.com/devcontainers/rust:0-1-bullseye", rust:slim-bookworm
+	"image": "mcr.microsoft.com/devcontainers/rust:0-1-bullseye",
+	"runArgs": [
+		"--network=host"
+	],
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	// "features": {},
+	// Configure tool-specific properties.
+	"customizations": {
+		// Configure properties specific to VS Code.
+		"vscode": {
+			"settings": {
+				"http.proxySupport": "override",
+				"http.proxy": "http://172.28.240.1:7890"
+			},
+			"extensions": [
+				"streetsidesoftware.code-spell-checker",
+				"GitHub.copilot",
+				"GitHub.copilot-chat",
+				"eamodio.gitlens"
+			]
+		}
+	},
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "rustc --version",
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root"
+}
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..77bc8ac
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,26 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "cc"
+version = "1.0.83"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1174fb0b6ec23863f8b971027804a42614e347eafb0a95bf0b12cdae21fc4d0"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "ffi_demo"
+version = "0.1.0"
+dependencies = [
+ "cc",
+ "libc",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.147"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..483ce07
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "ffi_demo"
+version = "0.1.0"
+edition = "2021"
+build = "build.rs"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[build-dependencies]
+cc = "1.0.79"
+
+[dependencies]
+libc = "0.2.0"
diff --git a/build.rs b/build.rs
new file mode 100644
index 0000000..705dedd
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,3 @@
+fn main() {
+    cc::Build::new().file("sample.c").compile("sample");
+}
\ No newline at end of file
diff --git a/sample.c b/sample.c
new file mode 100644
index 0000000..c73ab02
--- /dev/null
+++ b/sample.c
@@ -0,0 +1,3 @@
+int add(int a,int b){
+    return a+b;
+}
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..7f69b07
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,11 @@
+use std::os::raw::c_int;
+
+#[link(name = "sample")]
+extern "C" {
+    fn add(a: c_int, b: c_int) -> c_int;
+}
+
+fn main() {
+    let r = unsafe { add(2, 18) };
+    println!("{:?}", r);
+}
-- 
cgit v1.2.3