static linking

Chapter05/.gitignore

@@ -0,0 +1 @@
+src/*.o

Chapter05/Cargo.toml

@@ -1,6 +1,7 @@
 [package]
 name = "elevator"
 version = "1.0.0"
+build = "build.rs"
 
 [dependencies]
 floating-duration = "0.1.2"
@@ -9,6 +10,7 @@ timebomb = "0.1"
 serde = "1.0"
 serde_json = "1.0"
 serde_derive = "1.0"
+libc = "0.2"
 
 [[bin]]
 name = "simulate_trip"

Chapter05/README.md

@@ -0,0 +1,3 @@
+Linked object files are platform dependent. The C files and headers are provided, and a build/link script is provided.
+The build script is somewhat platform dependent and requires GCC to be installed. It may be necessary to adjust build.rs
+to compile this Chapter's code.

Chapter05/build.rs

@@ -0,0 +1,33 @@
+use std::process::Command;
+use std::env;
+use std::path::Path;
+
+fn main() {
+    let out_dir = env::var("OUT_DIR").unwrap();
+
+    Command::new("gcc").args(&["src/motor1.c", "-c", "-fPIC", "-o"])
+                       .arg(&format!("{}/motor1.o", out_dir))
+                       .status().unwrap();
+    Command::new("ar").args(&["crus", "libmotor1.a", "motor1.o"])
+                      .current_dir(&Path::new(&out_dir))
+                      .status().unwrap();
+
+    Command::new("gcc").args(&["src/motor2.c", "-c", "-fPIC", "-o"])
+                       .arg(&format!("{}/motor2.o", out_dir))
+                       .status().unwrap();
+    Command::new("ar").args(&["crus", "libmotor2.a", "motor2.o"])
+                      .current_dir(&Path::new(&out_dir))
+                      .status().unwrap();
+
+    Command::new("gcc").args(&["src/motor3.c", "-c", "-fPIC", "-o"])
+                       .arg(&format!("{}/motor3.o", out_dir))
+                       .status().unwrap();
+    Command::new("ar").args(&["crus", "libmotor3.a", "motor3.o"])
+                      .current_dir(&Path::new(&out_dir))
+                      .status().unwrap();
+
+    println!("cargo:rustc-link-search=native={}", out_dir);
+    println!("cargo:rustc-link-lib=static=motor1");
+    println!("cargo:rustc-link-lib=static=motor2");
+    println!("cargo:rustc-link-lib=static=motor3");
+}

Chapter05/src/lib.rs

@@ -1,6 +1,7 @@
+extern crate libc;
 
-mod motor_controllers;
-mod elevator_drivers;
-mod buildings;
-mod physics;
-mod trip_planning;
+pub mod motor_controllers;
+pub mod elevator_drivers;
+pub mod buildings;
+pub mod physics;
+pub mod trip_planning;

Chapter05/src/motor1.c

@@ -0,0 +1,6 @@
+
+int motor1_adjust_motor(int target_force){
+  //real driver would do something here
+  //interface with physical components
+  return 0;
+}

Chapter05/src/motor2.c

@@ -0,0 +1,6 @@
+
+int motor2_adjust_motor(int target_force){
+  //real driver would do something here
+  //interface with physical components
+  return 0;
+}

Chapter05/src/motor3.c

@@ -0,0 +1,6 @@
+
+int motor3_adjust_motor(int target_force){
+  //real driver would do something here
+  //interface with physical components
+  return 0;
+}

Chapter05/src/motor_controllers.rs

@@ -0,0 +1,16 @@
+use libc::c_int;
+
+#[link(name = "motor1")]
+extern {
+   pub fn motor1_adjust_motor(target_force: c_int) -> c_int;
+}
+
+#[link(name = "motor2")]
+extern {
+   pub fn motor2_adjust_motor(target_force: c_int) -> c_int;
+}
+
+#[link(name = "motor3")]
+extern {
+   pub fn motor3_adjust_motor(target_force: c_int) -> c_int;
+}

Chapter05/src/simulate_trip.rs

@@ -1,3 +1,15 @@
+extern crate elevator;
+use elevator::motor_controllers::{motor1_adjust_motor,motor2_adjust_motor,motor3_adjust_motor};
 
 fn main(){
+   unsafe {
+      println!("motor1 adjust");
+      motor1_adjust_motor(0);
+
+      println!("motor2 adjust");
+      motor2_adjust_motor(0);
+
+      println!("motor3 adjust");
+      motor3_adjust_motor(0);
+   }
 }