Start work on the client context

Cargo.toml

@@ -6,8 +6,10 @@ edition = "2018"
 repository = "https://github.com/bspeice/aeron-rs"
 readme = "README.md"
 license = "Apache-2.0"
+
+[badges]
 travis-ci = { repository = "bspeice/aeron-rs", branch = "master" }
 maintenance = { status = "actively-developed" }
 
 [dependencies]
-aeron_driver-sys = { path = "./aeron_driver-sys" }
+aeron_driver-sys = { path = "./aeron_driver-sys" }

README.md

@@ -2,4 +2,8 @@
 
 ![](https://img.shields.io/travis/bspeice/aeron-rs?style=flat-square)
 
-A Rust port of the [Aeron client](https://github.com/real-logic/Aeron).
+<!-- cargo-sync-readme start -->
+
+[Aeron](https://github.com/real-logic/aeron) client for Rust
+
+<!-- cargo-sync-readme end -->

aeron_driver-sys/bindings.h

@@ -1,2 +1,3 @@
 #include <stddef.h>
+#include <aeron_driver_context.h>
 #include <aeronmd.h>

src/context.rs

@@ -0,0 +1,44 @@
+use std::env;
+use std::path::PathBuf;
+
+const DEFAULT_MEDIA_DRIVER_TIMEOUT_MS: u16 = 10_000;
+const DEFAULT_RESOURCE_LINGER_MS: u16 = 5_000;
+
+pub struct Context {
+    aeron_dir: PathBuf,
+    media_driver_timeout_ms: i32,
+    resource_linger_timeout_ms: i32,
+    use_conductor_agent_invoker: bool,
+    pre_touch_mapped_memory: bool,
+}
+
+impl Context {
+    pub fn get_user_name() -> String {
+        env::var("USER")
+            .or_else(|_| env::var("USERNAME"))
+            .unwrap_or("default".to_string())
+    }
+
+    pub fn default_aeron_path() -> PathBuf {
+        let base_path = if cfg!(target_os = "linux") {
+            PathBuf::from("/dev/shm")
+        } else {
+            // Uses TMPDIR on Unix-like, and GetTempPath on Windows
+            env::temp_dir()
+        };
+
+        base_path.join(format!("aeron-{}", Context::get_user_name()))
+    }
+}
+
+impl Default for Context {
+    fn default() -> Self {
+        Context {
+            aeron_dir: Context::default_aeron_path(),
+            media_driver_timeout_ms: DEFAULT_MEDIA_DRIVER_TIMEOUT_MS.into(),
+            resource_linger_timeout_ms: DEFAULT_RESOURCE_LINGER_MS.into(),
+            use_conductor_agent_invoker: false,
+            pre_touch_mapped_memory: false,
+        }
+    }
+}

src/lib.rs

@@ -1,6 +1,8 @@
-//! Aeron client for Rust
+//! [Aeron](https://github.com/real-logic/aeron) client for Rust
 #![deny(missing_docs)]
 
+mod context;
+
 /// Retrieve the C library version in (major, minor, patch) format
 pub fn aeron_version() -> (u32, u32, u32) {
     unsafe {