Refactor project structure

kernel/aster-nix/src/syscall/getuid.rs

@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: MPL-2.0
+
+use super::{SyscallReturn, SYS_GETUID};
+use crate::{log_syscall_entry, prelude::*, process::credentials};
+
+pub fn sys_getuid() -> Result<SyscallReturn> {
+    log_syscall_entry!(SYS_GETUID);
+
+    let uid = {
+        let credentials = credentials();
+        credentials.ruid()
+    };
+
+    Ok(SyscallReturn::Return(uid.as_u32() as _))
+}