diff --git a/tests/contest/runtimetest/src/tests.rs b/tests/contest/runtimetest/src/tests.rs
index df40cf4a6..926955fa8 100644
--- a/tests/contest/runtimetest/src/tests.rs
+++ b/tests/contest/runtimetest/src/tests.rs
@@ -4,11 +4,12 @@ use std::os::unix::fs::{FileTypeExt, PermissionsExt};
 use std::path::Path;
 
 use anyhow::{bail, Result};
-use libc::{getgid, getuid};
+
 use nix::errno::Errno;
 use nix::libc;
+use nix::sys::stat::umask;
 use nix::sys::utsname;
-use nix::unistd::getcwd;
+use nix::unistd::{getcwd, getgid, getgroups, getuid, Gid, Uid};
 use oci_spec::runtime::IOPriorityClass::{self, IoprioClassBe, IoprioClassIdle, IoprioClassRt};
 use oci_spec::runtime::{LinuxDevice, LinuxDeviceType, LinuxSchedulerPolicy, Spec};
 
@@ -550,12 +551,12 @@ pub fn test_io_priority_class(spec: &Spec, io_priority_class: IOPriorityClass) {
 pub fn validate_process_user(spec: &Spec) {
     let process = spec.process().as_ref().unwrap();
 
-    let uid = unsafe { getuid() };
-    let gid = unsafe { getgid() };
-    let current_umask = unsafe { libc::umask(0) };
-    unsafe { libc::umask(current_umask) };
+    let uid = getuid();
+    let gid = getgid();
+    let current_umask = umask(nix::sys::stat::Mode::empty());
+    umask(current_umask);
 
-    if process.user().uid().ne(&uid) {
+    if Uid::from(process.user().uid()) != uid {
         eprintln!(
             "error due to uid want {}, got {}",
             process.user().uid(),
@@ -563,7 +564,7 @@ pub fn validate_process_user(spec: &Spec) {
         )
     }
 
-    if process.user().gid().ne(&gid) {
+    if Gid::from(process.user().gid()) != gid {
         eprintln!(
             "error due to gid want {}, got {}",
             process.user().gid(),
@@ -571,20 +572,37 @@ pub fn validate_process_user(spec: &Spec) {
         )
     }
 
-    if let Err(e) = utils::test_additional_gids(process.user().additional_gids().as_ref().unwrap())
-    {
+    if let Err(e) = validate_additional_gids(process.user().additional_gids().as_ref().unwrap()) {
         eprintln!("error additional gids {e}");
     }
 
     if process.user().umask().unwrap().ne(&current_umask) {
         eprintln!(
-            "error due to gid want {}, got {}",
+            "error due to gid want {}, got {:?}",
             process.user().umask().unwrap(),
             current_umask
         )
     }
 }
 
+// validate_additional_gids function is used to validate additional groups of user
+fn validate_additional_gids(gids: &Vec<u32>) -> std::result::Result<(), std::io::Error> {
+    let groups = getgroups().unwrap();
+
+    for group in groups {
+        for gid in gids {
+            if group != Gid::from(gid) {
+                return Err(std::io::Error::new(
+                    std::io::ErrorKind::Other,
+                    format!("error additional gid want {}, got {}", gid, group),
+                ));
+            }
+        }
+    }
+
+    Ok(())
+}
+
 // the validate_rootfs function is used to validate the rootfs of the container is
 // as expected. This function is used in the no_pivot test to validate the rootfs
 pub fn validate_rootfs() {
diff --git a/tests/contest/runtimetest/src/utils.rs b/tests/contest/runtimetest/src/utils.rs
index c2cdf81ec..4976fe5ae 100644
--- a/tests/contest/runtimetest/src/utils.rs
+++ b/tests/contest/runtimetest/src/utils.rs
@@ -4,7 +4,6 @@ use std::os::unix::prelude::MetadataExt;
 use std::path::PathBuf;
 use std::process::Command;
 
-use libc::getgroups;
 use nix::sys::stat::{stat, SFlag};
 
 fn test_file_read_access(path: &str) -> Result<(), std::io::Error> {
@@ -472,37 +471,3 @@ pub fn test_mount_rsuid_option(path: &str) -> Result<(), std::io::Error> {
         format!("rsuid error {path:?}"),
     ))
 }
-
-pub fn test_additional_gids(gids: &Vec<u32>) -> Result<(), std::io::Error> {
-    let ngroups = unsafe { getgroups(0, std::ptr::null_mut()) };
-
-    if ngroups == -1 {
-        return Err(std::io::Error::new(
-            std::io::ErrorKind::Other,
-            "error retrieving group count",
-        ));
-    }
-
-    let mut groups: Vec<libc::gid_t> = vec![0; ngroups as usize];
-    let result = unsafe { getgroups(ngroups, groups.as_mut_ptr()) };
-
-    if result == -1 {
-        return Err(std::io::Error::new(
-            std::io::ErrorKind::Other,
-            "error retrieving group IDs",
-        ));
-    }
-
-    for group in &groups {
-        for gid in gids {
-            if group != gid {
-                return Err(std::io::Error::new(
-                    std::io::ErrorKind::Other,
-                    format!("error additional gid want {}, got {}", gid, group),
-                ));
-            }
-        }
-    }
-
-    Ok(())
-}