commit cee8b9e96972ad64194e637b5506f362f62b2300
Author: pjht <pterpstra@pterpstra.com>
Date:   Thu Sep 26 11:27:36 2024 -0500

    Initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
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diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..656e369
--- /dev/null
+++ b/Cargo.lock
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..d4893b0
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "dir_rpc"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+parking_lot = "0.12.3"
+postcard = { version = "1.0.10", features = ["use-std"] }
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..fca1734
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,61 @@
+#![allow(clippy::result_unit_err)]
+
+use std::os::mikros::ipc::rpc::{self, IncomingCall};
+
+use parking_lot::RwLock;
+
+static SERVER: RwLock<Option<Box<dyn Server>>> = RwLock::new(None);
+
+const PROTO: u16 = 0;
+
+pub trait Server: Send + Sync {
+    fn next_entry(&self, fd: u64) -> Result<Option<String>, ()>;
+    fn close(&self, fd: u64) ;
+}
+
+#[derive(Copy, Clone)]
+pub struct Client(u64);
+
+impl Client {
+    pub fn new(pid: u64) -> Self {
+        Self(pid)
+    }
+
+    pub fn next_entry(self, fd: u64) -> Result<Option<String>, ()> {
+        postcard::from_bytes(
+            &rpc::send_call(self.0, PROTO, 0, &postcard::to_stdvec(&fd).unwrap()).get_return(),
+        )
+        .unwrap()
+    }
+
+    pub fn close(self, fd: u64) {
+        postcard::from_bytes(
+            &rpc::send_call(self.0, PROTO, 1, &postcard::to_stdvec(&fd).unwrap()).get_return(),
+        )
+        .unwrap()
+    }
+}
+
+pub fn register_server(server: Box<dyn Server>) {
+    *SERVER.write() = Some(server);
+    rpc::register_callback(PROTO, callback);
+}
+
+pub fn unregister_server() {
+    rpc::unregister_callback(PROTO);
+    *SERVER.write() = None;
+}
+
+fn callback(call: IncomingCall) {
+    let server_lock = SERVER.read();
+    let server = server_lock.as_ref().unwrap();
+    if call.func == 0 {
+        let fd = postcard::from_bytes(call.args()).unwrap();
+        let ret = postcard::to_stdvec(&server.next_entry(fd)).unwrap();
+        call.send_return(&ret);
+    } else if call.func == 1 {
+        let fd = postcard::from_bytes(call.args()).unwrap();
+        server.close(fd);
+        call.send_return(&[]);
+    }
+}