diff --git a/include/osmocom/core/socket.h b/include/osmocom/core/socket.h
index b2601c7..612b12c 100644
--- a/include/osmocom/core/socket.h
+++ b/include/osmocom/core/socket.h
@@ -5,14 +5,19 @@
 
 struct sockaddr;
 
+/* flags for osmo_sock_init. */
+#define OSMO_SOCK_F_CONNECT	(1 << 0)
+#define OSMO_SOCK_F_BIND	(1 << 1)
+#define OSMO_SOCK_F_NONBLOCK	(1 << 2)
+
 int osmo_sock_init(uint16_t family, uint16_t type, uint8_t proto,
-		   const char *host, uint16_t port, int connect0_bind1);
+		   const char *host, uint16_t port, unsigned int flags);
 
 int osmo_sock_init_ofd(struct osmo_fd *ofd, int family, int type, int proto,
-			const char *host, uint16_t port, int connect0_bind1);
+			const char *host, uint16_t port, unsigned int flags);
 
 int osmo_sock_init_sa(struct sockaddr *ss, uint16_t type,
-		      uint8_t proto, int connect0_bind1);
+		      uint8_t proto, unsigned int flags);
 
 /* determine if the given address is a local address */
 int osmo_sockaddr_is_local(struct sockaddr *addr, unsigned int addrlen);