Remove the shim kernel crate

kernel/src/syscall/setsockopt.rs

@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: MPL-2.0
+
+use super::SyscallReturn;
+use crate::{
+    fs::file_table::FileDesc,
+    prelude::*,
+    util::net::{get_socket_from_fd, new_raw_socket_option, CSocketOptionLevel},
+};
+
+pub fn sys_setsockopt(
+    sockfd: FileDesc,
+    level: i32,
+    optname: i32,
+    optval: Vaddr,
+    optlen: u32,
+    _ctx: &Context,
+) -> Result<SyscallReturn> {
+    let level = CSocketOptionLevel::try_from(level)?;
+    if optval == 0 {
+        return_errno_with_message!(Errno::EINVAL, "optval is null pointer");
+    }
+
+    debug!(
+        "level = {:?}, sockfd = {}, optname = {}, optval = {}",
+        level, sockfd, optname, optlen
+    );
+
+    let socket = get_socket_from_fd(sockfd)?;
+
+    let raw_option = {
+        let mut option = new_raw_socket_option(level, optname)?;
+
+        option.read_from_user(optval, optlen)?;
+
+        option
+    };
+
+    debug!("raw option: {:?}", raw_option);
+
+    socket.set_option(raw_option.as_sock_option())?;
+
+    Ok(SyscallReturn::Return(0))
+}