Remove the shim kernel crate

kernel/src/syscall/setgid.rs

@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: MPL-2.0
+
+use super::SyscallReturn;
+use crate::{prelude::*, process::Gid};
+
+pub fn sys_setgid(gid: i32, ctx: &Context) -> Result<SyscallReturn> {
+    debug!("gid = {}", gid);
+
+    if gid < 0 {
+        return_errno_with_message!(Errno::EINVAL, "gid cannot be negative");
+    }
+
+    let gid = Gid::new(gid as u32);
+
+    let credentials = ctx.posix_thread.credentials_mut();
+    credentials.set_gid(gid);
+
+    Ok(SyscallReturn::Return(0))
+}