Fix premature transport registration. Mark it deprecated.

Originally the idea was to better support having the transports
be separate loadable modules.  This isn't needed for the builtin
transports, so we make the explicit initialization of them
deprecated, and document it as such.

19 files changed, 147 insertions, 82 deletions

diff --git a/docs/man/nng_inproc_register.3.adoc b/docs/man/nng_inproc_register.3.adoc
index cf9afce2..8379a4e8 100644
--- a/docs/man/nng_inproc_register.3.adoc
+++ b/docs/man/nng_inproc_register.3.adoc
@@ -1,6 +1,6 @@
 = nng_inproc_register(3)
 //
-// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
+// Copyright 2021 Staysail Systems, Inc. <info@staysail.tech>
 // Copyright 2018 Capitar IT Group BV <info@capitar.com>
 //
 // This document is supplied under the terms of the MIT License, a
@@ -27,6 +27,9 @@ int nng_inproc_register(void);
 The `nng_inproc_register()` function registers the
 ((_inproc_ transport))(((transport, _inproc_))) for use.
 
+NOTE: This function is deprecated, and may be removed from a future release.
+It is no longer necessary to explicitly register transports.
+
 == RETURN VALUES
 
 This function returns 0 on success, and non-zero otherwise.
diff --git a/docs/man/nng_ipc_register.3.adoc b/docs/man/nng_ipc_register.3.adoc
index cfdf823a..64da4b00 100644
--- a/docs/man/nng_ipc_register.3.adoc
+++ b/docs/man/nng_ipc_register.3.adoc
@@ -1,6 +1,6 @@
 = nng_ipc_register(3)
 //
-// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
+// Copyright 2021 Staysail Systems, Inc. <info@staysail.tech>
 // Copyright 2018 Capitar IT Group BV <info@capitar.com>
 //
 // This document is supplied under the terms of the MIT License, a
@@ -27,6 +27,9 @@ int nng_ipc_register(void);
 The `nng_ipc_register()` function registers the
 ((_ipc_ transport))(((transport, _ipc_))) for use.
 
+NOTE: This function is deprecated, and may be removed from a future release.
+It is no longer necessary to explicitly register transports.
+
 == RETURN VALUES
 
 This function returns 0 on success, and non-zero otherwise.
diff --git a/docs/man/nng_tcp_register.3.adoc b/docs/man/nng_tcp_register.3.adoc
index 1a3a8581..3da671a9 100644
--- a/docs/man/nng_tcp_register.3.adoc
+++ b/docs/man/nng_tcp_register.3.adoc
@@ -1,6 +1,6 @@
 = nng_tcp_register(3)
 //
-// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
+// Copyright 2021 Staysail Systems, Inc. <info@staysail.tech>
 // Copyright 2018 Capitar IT Group BV <info@capitar.com>
 //
 // This document is supplied under the terms of the MIT License, a
@@ -27,6 +27,9 @@ int nng_tcp_register(void);
 The `nng_tcp_register()` function registers the
 ((_tcp_ transport))(((transport, _tcp_))) for use.
 
+NOTE: This function is deprecated, and may be removed from a future release.
+It is no longer necessary to explicitly register transports.
+
 == RETURN VALUES
 
 This function returns 0 on success, and non-zero otherwise.
diff --git a/docs/man/nng_ws_register.3.adoc b/docs/man/nng_ws_register.3.adoc
index a5f09d97..7a9cc1f3 100644
--- a/docs/man/nng_ws_register.3.adoc
+++ b/docs/man/nng_ws_register.3.adoc
@@ -1,6 +1,6 @@
 = nng_ws_register(3)
 //
-// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
+// Copyright 2021 Staysail Systems, Inc. <info@staysail.tech>
 // Copyright 2018 Capitar IT Group BV <info@capitar.com>
 //
 // This document is supplied under the terms of the MIT License, a
@@ -27,6 +27,9 @@ int nng_ws_register(void);
 The `nng_ws_register()` function registers the
 ((_ws_ transport))(((transport, _ws_))) for use.
 
+NOTE: This function is deprecated, and may be removed from a future release.
+It is no longer necessary to explicitly register transports.
+
 == RETURN VALUES
 
 This function returns 0 on success, and non-zero otherwise.
diff --git a/docs/man/nng_wss_register.3.adoc b/docs/man/nng_wss_register.3.adoc
index 14f434d6..856fe1c0 100644
--- a/docs/man/nng_wss_register.3.adoc
+++ b/docs/man/nng_wss_register.3.adoc
@@ -1,6 +1,6 @@
 = nng_wss_register(3)
 //
-// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
+// Copyright 2021 Staysail Systems, Inc. <info@staysail.tech>
 // Copyright 2018 Capitar IT Group BV <info@capitar.com>
 //
 // This document is supplied under the terms of the MIT License, a
@@ -27,6 +27,9 @@ int nng_wss_register(void);
 The `nng_wss_register()` function registers the
 ((_wss_ transport))(((transport, _wss_))) for use.
 
+NOTE: This function is deprecated, and may be removed from a future release.
+It is no longer necessary to explicitly register transports.
+
 == RETURN VALUES
 
 This function returns 0 on success, and non-zero otherwise.
diff --git a/docs/man/nng_zt_register.3.adoc b/docs/man/nng_zt_register.3.adoc
index e3cc4060..9c4a4ac4 100644
--- a/docs/man/nng_zt_register.3.adoc
+++ b/docs/man/nng_zt_register.3.adoc
@@ -1,6 +1,6 @@
 = nng_zt_register(3)
 //
-// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
+// Copyright 2021 Staysail Systems, Inc. <info@staysail.tech>
 // Copyright 2018 Capitar IT Group BV <info@capitar.com>
 //
 // This document is supplied under the terms of the MIT License, a
@@ -27,6 +27,9 @@ int nng_zt_register(void);
 The `nng_zt_register()` function registers the
 ((_zt_ transport))(((transport, _zt_))) for use.
 
+NOTE: This function is deprecated, and may be removed from a future release.
+It is no longer necessary to explicitly register transports.
+
 == RETURN VALUES
 
 This function returns 0 on success, and non-zero otherwise.
diff --git a/include/nng/transport/inproc/inproc.h b/include/nng/transport/inproc/inproc.h
index 80a83883..0c633620 100644
--- a/include/nng/transport/inproc/inproc.h
+++ b/include/nng/transport/inproc/inproc.h
@@ -1,5 +1,5 @@
 //
-// Copyright 2019 Staysail Systems, Inc. <info@staysail.tech>
+// Copyright 2021 Staysail Systems, Inc. <info@staysail.tech>
 // Copyright 2017 Capitar IT Group BV <info@capitar.com>
 //
 // This software is supplied under the terms of the MIT License, a
@@ -18,8 +18,9 @@ extern "C" {
 #endif
 
 // inproc transport.  This is used for intra-process communication.
-
+#ifndef NNG_ELIDE_DEPRECATED
 NNG_DECL int nng_inproc_register(void);
+#endif
 
 #ifdef __cplusplus
 }
diff --git a/include/nng/transport/ipc/ipc.h b/include/nng/transport/ipc/ipc.h
index 18d2046d..cccef9a1 100644
--- a/include/nng/transport/ipc/ipc.h
+++ b/include/nng/transport/ipc/ipc.h
@@ -1,5 +1,5 @@
 //
-// Copyright 2019 Staysail Systems, Inc. <info@staysail.tech>
+// Copyright 2021 Staysail Systems, Inc. <info@staysail.tech>
 // Copyright 2018 Capitar IT Group BV <info@capitar.com>
 //
 // This software is supplied under the terms of the MIT License, a
@@ -20,7 +20,9 @@ extern "C" {
 // ipc transport.  This is used for inter-process communication on
 // the same host computer.
 
+#ifndef NNG_ELIDE_DEPRECATED
 NNG_DECL int nng_ipc_register(void);
+#endif
 
 #ifdef __cplusplus
 }
diff --git a/include/nng/transport/tcp/tcp.h b/include/nng/transport/tcp/tcp.h
index 2ca40b70..e236c271 100644
--- a/include/nng/transport/tcp/tcp.h
+++ b/include/nng/transport/tcp/tcp.h
@@ -1,5 +1,5 @@
 //
-// Copyright 2019 Staysail Systems, Inc. <info@staysail.tech>
+// Copyright 2021 Staysail Systems, Inc. <info@staysail.tech>
 // Copyright 2017 Capitar IT Group BV <info@capitar.com>
 //
 // This software is supplied under the terms of the MIT License, a
@@ -19,7 +19,9 @@ extern "C" {
 
 // TCP transport.  This is used for communication over TCP/IP.
 
+#ifndef NNG_ELIDE_DEPRECATED
 NNG_DECL int nng_tcp_register(void);
+#endif
 
 #ifdef __cplusplus
 }
diff --git a/include/nng/transport/tls/tls.h b/include/nng/transport/tls/tls.h
index 700d5fff..5e99372b 100644
--- a/include/nng/transport/tls/tls.h
+++ b/include/nng/transport/tls/tls.h
@@ -19,7 +19,9 @@ extern "C" {
 
 // TLS transport.  This is used for communication via TLS v1.2 over TCP/IP.
 
+#ifndef NNG_ELIDE_DEPRECATED
 NNG_DECL int nng_tls_register(void);
+#endif
 
 #ifdef __cplusplus
 }
diff --git a/include/nng/transport/ws/websocket.h b/include/nng/transport/ws/websocket.h
index 69577107..a5f97d46 100644
--- a/include/nng/transport/ws/websocket.h
+++ b/include/nng/transport/ws/websocket.h
@@ -1,5 +1,5 @@
 //
-// Copyright 2019 Staysail Systems, Inc. <info@staysail.tech>
+// Copyright 2021 Staysail Systems, Inc. <info@staysail.tech>
 // Copyright 2018 Capitar IT Group BV <info@capitar.com>
 //
 // This software is supplied under the terms of the MIT License, a
@@ -19,13 +19,14 @@ extern "C" {
 
 // WebSocket transport.  This is used for communication via WebSocket.
 
-NNG_DECL int nng_ws_register(void);
-
 // These aliases are for WSS naming consistency.
 #define NNG_OPT_WSS_REQUEST_HEADERS NNG_OPT_WS_REQUEST_HEADERS
 #define NNG_OPT_WSS_RESPONSE_HEADERS NNG_OPT_WS_RESPONSE_HEADERS
 
+#ifndef NNG_ELIDE_DEPRECATED
+NNG_DECL int nng_ws_register(void);
 NNG_DECL int nng_wss_register(void);
+#endif
 
 #ifdef __cplusplus
 }
diff --git a/include/nng/transport/zerotier/zerotier.h b/include/nng/transport/zerotier/zerotier.h
index ea73fea7..b8745dbd 100644
--- a/include/nng/transport/zerotier/zerotier.h
+++ b/include/nng/transport/zerotier/zerotier.h
@@ -150,7 +150,9 @@ enum nng_zt_status {
 	NNG_ZT_STATUS_UNKNOWN,
 };
 
+#ifndef NNG_ELIDE_DEPRECATED
 NNG_DECL int nng_zt_register(void);
+#endif
 
 #ifdef __cplusplus
 }
diff --git a/src/sp/transport.c b/src/sp/transport.c
index dba530e0..13961eaa 100644
--- a/src/sp/transport.c
+++ b/src/sp/transport.c
@@ -11,25 +11,6 @@
 
 #include "core/nng_impl.h"
 
-#ifdef NNG_TRANSPORT_INPROC
-#include "nng/transport/inproc/inproc.h"
-#endif
-#ifdef NNG_TRANSPORT_IPC
-#include "nng/transport/ipc/ipc.h"
-#endif
-#ifdef NNG_TRANSPORT_TCP
-#include "nng/transport/tcp/tcp.h"
-#endif
-#ifdef NNG_TRANSPORT_TLS
-#include "nng/transport/tls/tls.h"
-#endif
-#ifdef NNG_TRANSPORT_WS
-#include "nng/transport/ws/websocket.h"
-#endif
-#ifdef NNG_TRANSPORT_ZEROTIER
-#include "nng/transport/zerotier/zerotier.h"
-#endif
-
 #include <stdio.h>
 #include <string.h>
 
@@ -67,6 +48,28 @@ nni_sp_tran_find(nni_url *url)
 // nni_sp_tran_sys_init initializes the entire transport subsystem, including
 // each individual transport.
 
+#ifdef NNG_TRANSPORT_INPROC
+extern void nni_sp_inproc_register(void);
+#endif
+#ifdef NNG_TRANSPORT_IPC
+extern void nni_sp_ipc_register(void);
+#endif
+#ifdef NNG_TRANSPORT_TCP
+extern void nni_sp_tcp_register(void);
+#endif
+#ifdef NNG_TRANSPORT_TLS
+extern void nni_sp_tls_register(void);
+#endif
+#ifdef NNG_TRANSPORT_WS
+extern void nni_sp_ws_register(void);
+#endif
+#ifdef NNG_TRANSPORT_WSS
+extern void nni_sp_wss_register(void);
+#endif
+#ifdef NNG_TRANSPORT_ZEROTIER
+extern void nni_sp_zt_register(void);
+#endif
+
 int
 nni_sp_tran_sys_init(void)
 {
@@ -74,25 +77,25 @@ nni_sp_tran_sys_init(void)
 	nni_rwlock_init(&sp_tran_lk);
 
 #ifdef NNG_TRANSPORT_INPROC
-	nng_inproc_register();
+	nni_sp_inproc_register();
 #endif
 #ifdef NNG_TRANSPORT_IPC
-	nng_ipc_register();
+	nni_sp_ipc_register();
 #endif
 #ifdef NNG_TRANSPORT_TCP
-	nng_tcp_register();
+	nni_sp_tcp_register();
 #endif
 #ifdef NNG_TRANSPORT_TLS
-	nng_tls_register();
+	nni_sp_tls_register();
 #endif
 #ifdef NNG_TRANSPORT_WS
-	nng_ws_register();
+	nni_sp_ws_register();
 #endif
 #ifdef NNG_TRANSPORT_WSS
-	nng_wss_register();
+	nni_sp_wss_register();
 #endif
 #ifdef NNG_TRANSPORT_ZEROTIER
-	nng_zt_register();
+	nni_sp_zt_register();
 #endif
 	return (0);
 }
diff --git a/src/sp/transport/inproc/inproc.c b/src/sp/transport/inproc/inproc.c
index a67d6d18..971b8877 100644
--- a/src/sp/transport/inproc/inproc.c
+++ b/src/sp/transport/inproc/inproc.c
@@ -313,9 +313,9 @@ inproc_listener_init(void **epp, nni_url *url, nni_listener *nlistener)
 	}
 	nni_mtx_init(&ep->mtx);
 
-	ep->listener  = true;
-	ep->proto     = nni_sock_proto_id(sock);
-	ep->rcvmax    = 0;
+	ep->listener = true;
+	ep->proto    = nni_sock_proto_id(sock);
+	ep->rcvmax   = 0;
 	NNI_LIST_INIT(&ep->clients, inproc_ep, node);
 	nni_aio_list_init(&ep->aios);
 
@@ -683,9 +683,16 @@ struct nni_sp_tran nni_inproc_tran = {
 	.tran_fini     = inproc_fini,
 };
 
+#ifndef NNG_ELIDE_DEPRECATED
 int
 nng_inproc_register(void)
 {
+	return (nni_init());
+}
+#endif
+
+void
+nni_sp_inproc_register(void)
+{
 	nni_sp_tran_register(&nni_inproc_tran);
-	return (0);
 }
diff --git a/src/sp/transport/ipc/ipc.c b/src/sp/transport/ipc/ipc.c
index 502943a5..8ed4ac94 100644
--- a/src/sp/transport/ipc/ipc.c
+++ b/src/sp/transport/ipc/ipc.c
@@ -1148,9 +1148,18 @@ static nni_sp_tran ipc_tran_abstract = {
 };
 #endif
 
+
+#ifndef NNG_ELIDE_DEPRECATED
 int
 nng_ipc_register(void)
 {
+	return (nni_init());
+}
+#endif
+
+void
+nni_sp_ipc_register(void)
+{
 	nni_sp_tran_register(&ipc_tran);
 #ifdef NNG_PLATFORM_POSIX
 	nni_sp_tran_register(&ipc_tran_unix);
@@ -1158,6 +1167,4 @@ nng_ipc_register(void)
 #ifdef NNG_HAVE_ABSTRACT_SOCKETS
 	nni_sp_tran_register(&ipc_tran_abstract);
 #endif
-
-	return (0);
 }
diff --git a/src/sp/transport/tcp/tcp.c b/src/sp/transport/tcp/tcp.c
index 3aa20f38..e2e7fbce 100644
--- a/src/sp/transport/tcp/tcp.c
+++ b/src/sp/transport/tcp/tcp.c
@@ -1247,11 +1247,18 @@ static nni_sp_tran tcp6_tran = {
 	.tran_fini     = tcptran_fini,
 };
 
+#ifndef NNG_ELIDE_DEPRECATED
 int
 nng_tcp_register(void)
 {
+	return (nni_init());
+}
+#endif
+
+void
+nni_sp_tcp_register(void)
+{
 	nni_sp_tran_register(&tcp_tran);
 	nni_sp_tran_register(&tcp4_tran);
 	nni_sp_tran_register(&tcp6_tran);
-	return (0);
 }
diff --git a/src/sp/transport/tls/tls.c b/src/sp/transport/tls/tls.c
index 91c0f1c9..75858839 100644
--- a/src/sp/transport/tls/tls.c
+++ b/src/sp/transport/tls/tls.c
@@ -1279,8 +1279,13 @@ static nni_sp_tran tls6_tran = {
 int
 nng_tls_register(void)
 {
+	return (nni_init());
+}
+
+void
+nni_sp_tls_register(void)
+{
 	nni_sp_tran_register(&tls_tran);
 	nni_sp_tran_register(&tls4_tran);
 	nni_sp_tran_register(&tls6_tran);
-	return (0);
 }
diff --git a/src/sp/transport/ws/websocket.c b/src/sp/transport/ws/websocket.c
index a3f2cd26..7cf9949f 100644
--- a/src/sp/transport/ws/websocket.c
+++ b/src/sp/transport/ws/websocket.c
@@ -667,14 +667,26 @@ static nni_sp_tran ws6_tran = {
 	.tran_fini     = wstran_fini,
 };
 
+#ifndef NNG_ELIDE_DEPRECATED
 int
 nng_ws_register(void)
 {
+	return (nni_init());
+}
+
+int
+nng_wss_register(void)
+{
+	return (nni_init());
+}
+#endif
+
+void
+nni_sp_ws_register(void)
+{
 	nni_sp_tran_register(&ws_tran);
 	nni_sp_tran_register(&ws4_tran);
 	nni_sp_tran_register(&ws6_tran);
-
-	return (0);
 }
 
 #ifdef NNG_TRANSPORT_WSS
@@ -706,22 +718,12 @@ static nni_sp_tran wss6_tran = {
 	.tran_fini     = wstran_fini,
 };
 
-int
-nng_wss_register(void)
+void
+nni_sp_wss_register(void)
 {
 	nni_sp_tran_register(&wss_tran);
 	nni_sp_tran_register(&wss4_tran);
 	nni_sp_tran_register(&wss6_tran);
-
-	return (0);
-}
-
-#else
-
-int
-nng_wss_register(void)
-{
-	return (0);
 }
 
 #endif // NNG_TRANSPORT_WSS
diff --git a/src/sp/transport/zerotier/zerotier.c b/src/sp/transport/zerotier/zerotier.c
index 15c0fe9f..5658fb18 100644
--- a/src/sp/transport/zerotier/zerotier.c
+++ b/src/sp/transport/zerotier/zerotier.c
@@ -58,18 +58,17 @@ typedef struct zt_node     zt_node;
 typedef struct zt_frag     zt_frag;
 typedef struct zt_fraglist zt_fraglist;
 
-
 // Port numbers are stored as 24-bit values in network byte order.
-#define ZT_GET24(ptr, v)                              \
-	v = (((uint32_t)((uint8_t)(ptr)[0])) << 16) + \
-	    (((uint32_t)((uint8_t)(ptr)[1])) << 8) +  \
-	    (((uint32_t)(uint8_t)(ptr)[2]))
-
-#define ZT_PUT24(ptr, u)                                     \
-	do {                                                 \
-		(ptr)[0] = (uint8_t)(((uint32_t)(u)) >> 16); \
-		(ptr)[1] = (uint8_t)(((uint32_t)(u)) >> 8);  \
-		(ptr)[2] = (uint8_t)((uint32_t)(u));         \
+#define ZT_GET24(ptr, v)                                \
+	v = (((uint32_t) ((uint8_t) (ptr)[0])) << 16) + \
+	    (((uint32_t) ((uint8_t) (ptr)[1])) << 8) +  \
+	    (((uint32_t) (uint8_t) (ptr)[2]))
+
+#define ZT_PUT24(ptr, u)                                       \
+	do {                                                   \
+		(ptr)[0] = (uint8_t) (((uint32_t) (u)) >> 16); \
+		(ptr)[1] = (uint8_t) (((uint32_t) (u)) >> 8);  \
+		(ptr)[2] = (uint8_t) ((uint32_t) (u));         \
 	} while (0)
 
 static const uint16_t     zt_ethertype = 0x901;
@@ -455,7 +454,7 @@ zt_node_to_mac(uint64_t node, uint64_t nwid)
 	// multicast and set local administration -- this is the first
 	// octet of the 48 bit mac address.  We also avoid 0x52, which
 	// is known to be used in KVM, libvirt, etc.
-	mac = ((uint8_t)(nwid & 0xfe) | 0x02);
+	mac = ((uint8_t) (nwid & 0xfe) | 0x02);
 	if (mac == 0x52) {
 		mac = 0x32;
 	}
@@ -907,7 +906,7 @@ zt_pipe_recv_data(zt_pipe *p, const uint8_t *data, size_t len)
 		return;
 	}
 
-	bit = (uint8_t)(1 << (fragno % 8));
+	bit = (uint8_t) (1 << (fragno % 8));
 	if ((fl->fl_missing[fragno / 8] & bit) == 0) {
 		// We've already got this fragment, ignore it.  We don't
 		// bother to check for changed data.
@@ -1714,8 +1713,8 @@ zt_pipe_fini(void *arg)
 }
 
 static nni_reap_list zt_reap_list = {
-       .rl_offset = offsetof(zt_pipe, zp_reap),
-       .rl_func   = zt_pipe_fini,
+	.rl_offset = offsetof(zt_pipe, zp_reap),
+	.rl_func   = zt_pipe_fini,
 };
 
 static void
@@ -1841,15 +1840,15 @@ zt_pipe_send(void *arg, nni_aio *aio)
 	NNI_ASSERT(fragsz < 0x10000); // Because zp_mtu is 16 bits
 
 	msg_header_len = nni_msg_header_len(m);
-	msg_len = nni_msg_len(m);
-	bytes = msg_header_len + msg_len;
+	msg_len        = nni_msg_len(m);
+	bytes          = msg_header_len + msg_len;
 	if (bytes >= (0xfffe * fragsz)) {
 		nni_aio_finish_error(aio, NNG_EMSGSIZE);
 		nni_mtx_unlock(&zt_lk);
 		return;
 	}
 	// above check means nfrags will fit in 16-bits.
-	nfrags = (uint16_t)((bytes + (fragsz - 1)) / fragsz);
+	nfrags = (uint16_t) ((bytes + (fragsz - 1)) / fragsz);
 
 	// get the next message ID, but skip 0
 	if ((id = p->zp_next_msgid++) == 0) {
@@ -1865,7 +1864,7 @@ zt_pipe_send(void *arg, nni_aio *aio)
 		size_t   len;
 
 		// Prepend the header first.
-		if ( (!offset)  && (msg_header_len > 0)) {
+		if ((!offset) && (msg_header_len > 0)) {
 			if (msg_header_len > fragsz) {
 				// This shouldn't happen!  SP headers are
 				// supposed to be quite small.
@@ -1895,7 +1894,7 @@ zt_pipe_send(void *arg, nni_aio *aio)
 		fragno++;
 		zt_send(p->zp_ztn, p->zp_nwid, zt_op_data, p->zp_raddr,
 		    p->zp_laddr, data, fraglen + zt_offset_data_data);
-	} while (msg_header_len  + msg_len -offset != 0);
+	} while (msg_header_len + msg_len - offset != 0);
 	nni_mtx_unlock(&zt_lk);
 
 	// NB, We never bothered to call nn_aio_sched, because we run this
@@ -3240,9 +3239,16 @@ static struct nni_tran zt_tran = {
 	.tran_fini     = zt_tran_fini,
 };
 
+#ifndef NNG_ELIDE_DEPRECATED
 int
 nng_zt_register(void)
 {
+	return (nni_init());
+}
+#endif
+
+void
+nni_sp_zt_register(void)
+{
 	nni_tran_register(&zt_tran);
-	return (0);
 }