ipcd: implement SO_SNDBUF/SO_RCVBUF socket options

ipcd/src/uds/stream.rs

@@ -184,6 +184,8 @@ pub struct Socket {
     connection: Option<Connection>,
     issued_token: Option<u64>,
     ucred: ucred,
+    sndbuf: i32,
+    rcvbuf: i32,
 }
 
 impl Socket {
@@ -211,6 +213,8 @@ impl Socket {
                 uid: ctx.uid as _,
                 gid: ctx.gid as _,
             },
+            sndbuf: 212992, // Linux default
+            rcvbuf: 212992, // Linux default
         }
     }
 
@@ -659,8 +663,14 @@ impl<'sock> UdsStreamScheme<'sock> {
                 Ok(value_slice.len())
             }
             libc::SO_SNDBUF => {
-                // FIXME: implement
-                Ok(0)
+                let value = read_num::<i32>(value_slice)?;
+                socket.sndbuf = value;
+                Ok(value_slice.len())
+            }
+            libc::SO_RCVBUF => {
+                let value = read_num::<i32>(value_slice)?;
+                socket.rcvbuf = value;
+                Ok(value_slice.len())
             }
             _ => {
                 eprintln!(
@@ -688,6 +698,8 @@ impl<'sock> UdsStreamScheme<'sock> {
             payload[..value.len()].copy_from_slice(&value);
             Ok(value.len())
         };
+        let socket_rc = self.get_socket(id)?;
+        let socket = socket_rc.borrow();
         match option {
             libc::SO_DOMAIN => write_value(&AF_UNIX.to_le_bytes()),
             libc::SO_PEERCRED => {
@@ -701,9 +713,10 @@ impl<'sock> UdsStreamScheme<'sock> {
                 })
             }
             libc::SO_SNDBUF => {
-                //TODO: default value on Linux, should we use something else?
-                let value: libc::c_int = 212992;
-                write_value(&value.to_le_bytes())
+                write_value(&socket.sndbuf.to_le_bytes())
+            }
+            libc::SO_RCVBUF => {
+                write_value(&socket.rcvbuf.to_le_bytes())
             }
             _ => {
                 eprintln!(