-extern ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd);
-
-extern ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len);
-extern ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len);
-
-extern ssize_t lttcomm_send_creds_unix_sock(int sock, void *buf, size_t len);
-extern ssize_t lttcomm_recv_creds_unix_sock(int sock, void *buf, size_t len,
+LTTNG_HIDDEN
+ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd);
+
+LTTNG_HIDDEN
+ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len);
+LTTNG_HIDDEN
+ssize_t lttcomm_send_unix_sock(int sock, const void *buf, size_t len);
+
+LTTNG_HIDDEN
+ssize_t lttcomm_send_creds_unix_sock(int sock, void *buf, size_t len);
+LTTNG_HIDDEN
+ssize_t lttcomm_recv_creds_unix_sock(int sock, void *buf, size_t len,