+#elif defined(__FreeBSD__)
+
+#include <sys/ucred.h>
+
+static inline
+int lttng_get_unix_socket_peer_pid(int socket_fd, pid_t *pid)
+{
+ int ret;
+ struct xucred sock_creds = {};
+
+ /* Only available in FreeBSD 13.0 and up. */
+ ret = getsockopt(socket_fd, SOL_LOCAL, LOCAL_PEERCRED, &sock_creds,
+ &((socklen_t) {sizeof(sock_creds)}));
+ if (ret) {
+ goto end;
+ }
+
+ *pid = sock_creds.cr_pid;
+end:
+ return ret;
+}
+
+#endif /* __APPLE__ */
+
+
+static inline
+int lttng_get_unix_socket_peer_creds(int socket_fd, struct lttng_sock_cred *creds)
+{
+ int ret;
+
+ /* This is a BSD extension that is supported by Cygwin. */
+ ret = getpeereid(socket_fd, &creds->uid, &creds->gid);
+ if (ret) {
+ goto end;
+ }
+
+ /*
+ * Getting a peer's PID is a bit more troublesome as it is platform
+ * specific.
+ */
+ ret = lttng_get_unix_socket_peer_pid(socket_fd, &creds->pid);
+end:
+ return ret;
+}
+
+#else
+#error "Please add support for your OS."
+#endif /* __linux__ , __FreeBSD__, __APPLE__ */