1 files changed, 18 insertions, 1 deletions
diff --git a/library/std/src/sys/unix/ext/ucred/tests.rs b/library/std/src/sys/unix/ext/ucred/tests.rs
index 451b534b266..b3e45d3337c 100644
--- a/library/std/src/sys/unix/ext/ucred/tests.rs
+++ b/library/std/src/sys/unix/ext/ucred/tests.rs
@@ -1,5 +1,5 @@
 use crate::os::unix::net::UnixStream;
-use libc::{getegid, geteuid};
+use libc::{getegid, geteuid, getpid};
 
 #[test]
 #[cfg(any(
@@ -23,3 +23,20 @@ fn test_socket_pair() {
     assert_eq!(cred_a.uid, uid);
     assert_eq!(cred_a.gid, gid);
 }
+
+#[test]
+#[cfg(any(
+    target_os = "linux",
+    target_os = "ios",
+    target_os = "macos",
+))]
+fn test_socket_pair_pids(arg: Type) -> RetType {
+    // Create two connected sockets and get their peer credentials.
+    let (sock_a, sock_b) = UnixStream::pair().unwrap();
+    let (cred_a, cred_b) = (sock_a.peer_cred().unwrap(), sock_b.peer_cred().unwrap());
+
+    // On supported platforms (see the cfg above), the credentials should always include the PID.
+    let pid = unsafe { getpid() };
+    assert_eq!(cred_a.pid, Some(pid));
+    assert_eq!(cred_b.pid, Some(pid));
+}