diff options
Diffstat (limited to 'src/protocol/pubsub0')
| -rw-r--r-- | src/protocol/pubsub0/CMakeLists.txt | 23 | ||||
| -rw-r--r-- | src/protocol/pubsub0/pub.c | 344 | ||||
| -rw-r--r-- | src/protocol/pubsub0/pub.h | 28 | ||||
| -rw-r--r-- | src/protocol/pubsub0/sub.c | 404 | ||||
| -rw-r--r-- | src/protocol/pubsub0/sub.h | 31 |
5 files changed, 830 insertions, 0 deletions
diff --git a/src/protocol/pubsub0/CMakeLists.txt b/src/protocol/pubsub0/CMakeLists.txt new file mode 100644 index 00000000..4edcbfae --- /dev/null +++ b/src/protocol/pubsub0/CMakeLists.txt @@ -0,0 +1,23 @@ +# +# Copyright 2017 Garrett D'Amore <garrett@damore.org> +# Copyright 2017 Capitar IT Group BV <info@capitar.com> +# +# This software is supplied under the terms of the MIT License, a +# copy of which should be located in the distribution where this +# file was obtained (LICENSE.txt). A copy of the license may also be +# found online at https://opensource.org/licenses/MIT. +# + +# Pub/Sub protocol + +if (NNG_PROTO_PUB0) + set(PUB0_SOURCES protocol/pubsub0/pub.c protocol/pubsub0/pub.h) + install(FILES pub.h DESTINATION include/nng/protocol/pubsub0) +endif() + +if (NNG_PROTO_SUB0) + set(SUB0_SOURCES protocol/pubsub0/sub.c protocol/pubsub0/sub.h) + install(FILES sub.h DESTINATION include/nng/protocol/pubsub0) +endif() + +set(NNG_SOURCES ${NNG_SOURCES} ${PUB0_SOURCES} ${SUB0_SOURCES} PARENT_SCOPE)
\ No newline at end of file diff --git a/src/protocol/pubsub0/pub.c b/src/protocol/pubsub0/pub.c new file mode 100644 index 00000000..f4a33b77 --- /dev/null +++ b/src/protocol/pubsub0/pub.c @@ -0,0 +1,344 @@ +// +// Copyright 2017 Garrett D'Amore <garrett@damore.org> +// Copyright 2017 Capitar IT Group BV <info@capitar.com> +// +// This software is supplied under the terms of the MIT License, a +// copy of which should be located in the distribution where this +// file was obtained (LICENSE.txt). A copy of the license may also be +// found online at https://opensource.org/licenses/MIT. +// + +#include <stdlib.h> +#include <string.h> + +#include "core/nng_impl.h" +#include "protocol/pubsub0/pub.h" + +// Publish protocol. The PUB protocol simply sends messages out, as +// a broadcast. It has nothing more sophisticated because it does not +// perform sender-side filtering. Its best effort delivery, so anything +// that can't receive the message won't get one. + +#ifndef NNI_PROTO_SUB_V0 +#define NNI_PROTO_SUB_V0 NNI_PROTO(2, 1) +#endif + +#ifndef NNI_PROTO_PUB_V0 +#define NNI_PROTO_PUB_V0 NNI_PROTO(2, 0) +#endif + +typedef struct pub0_pipe pub0_pipe; +typedef struct pub0_sock pub0_sock; + +static void pub0_pipe_recv_cb(void *); +static void pub0_pipe_send_cb(void *); +static void pub0_pipe_getq_cb(void *); +static void pub0_sock_getq_cb(void *); +static void pub0_sock_fini(void *); +static void pub0_pipe_fini(void *); + +// pub0_sock is our per-socket protocol private structure. +struct pub0_sock { + nni_msgq *uwq; + int raw; + nni_aio * aio_getq; + nni_list pipes; + nni_mtx mtx; +}; + +// pub0_pipe is our per-pipe protocol private structure. +struct pub0_pipe { + nni_pipe * pipe; + pub0_sock * pub; + nni_msgq * sendq; + nni_aio * aio_getq; + nni_aio * aio_send; + nni_aio * aio_recv; + nni_list_node node; +}; + +static void +pub0_sock_fini(void *arg) +{ + pub0_sock *s = arg; + + nni_aio_stop(s->aio_getq); + nni_aio_fini(s->aio_getq); + nni_mtx_fini(&s->mtx); + NNI_FREE_STRUCT(s); +} + +static int +pub0_sock_init(void **sp, nni_sock *sock) +{ + pub0_sock *s; + int rv; + + if ((s = NNI_ALLOC_STRUCT(s)) == NULL) { + return (NNG_ENOMEM); + } + nni_mtx_init(&s->mtx); + if ((rv = nni_aio_init(&s->aio_getq, pub0_sock_getq_cb, s)) != 0) { + pub0_sock_fini(s); + return (rv); + } + + s->raw = 0; + NNI_LIST_INIT(&s->pipes, pub0_pipe, node); + + s->uwq = nni_sock_sendq(sock); + + *sp = s; + return (0); +} + +static void +pub0_sock_open(void *arg) +{ + pub0_sock *s = arg; + + nni_msgq_aio_get(s->uwq, s->aio_getq); +} + +static void +pub0_sock_close(void *arg) +{ + pub0_sock *s = arg; + + nni_aio_cancel(s->aio_getq, NNG_ECLOSED); +} + +static void +pub0_pipe_fini(void *arg) +{ + pub0_pipe *p = arg; + nni_aio_fini(p->aio_getq); + nni_aio_fini(p->aio_send); + nni_aio_fini(p->aio_recv); + nni_msgq_fini(p->sendq); + NNI_FREE_STRUCT(p); +} + +static int +pub0_pipe_init(void **pp, nni_pipe *pipe, void *s) +{ + pub0_pipe *p; + int rv; + + if ((p = NNI_ALLOC_STRUCT(p)) == NULL) { + return (NNG_ENOMEM); + } + + // XXX: consider making this depth tunable + if (((rv = nni_msgq_init(&p->sendq, 16)) != 0) || + ((rv = nni_aio_init(&p->aio_getq, pub0_pipe_getq_cb, p)) != 0) || + ((rv = nni_aio_init(&p->aio_send, pub0_pipe_send_cb, p)) != 0) || + ((rv = nni_aio_init(&p->aio_recv, pub0_pipe_recv_cb, p)) != 0)) { + + pub0_pipe_fini(p); + return (rv); + } + + p->pipe = pipe; + p->pub = s; + *pp = p; + return (0); +} + +static int +pub0_pipe_start(void *arg) +{ + pub0_pipe *p = arg; + pub0_sock *s = p->pub; + + if (nni_pipe_peer(p->pipe) != NNI_PROTO_SUB_V0) { + return (NNG_EPROTO); + } + nni_mtx_lock(&s->mtx); + nni_list_append(&s->pipes, p); + nni_mtx_unlock(&s->mtx); + + // Start the receiver and the queue reader. + nni_pipe_recv(p->pipe, p->aio_recv); + nni_msgq_aio_get(p->sendq, p->aio_getq); + + return (0); +} + +static void +pub0_pipe_stop(void *arg) +{ + pub0_pipe *p = arg; + pub0_sock *s = p->pub; + + nni_aio_stop(p->aio_getq); + nni_aio_stop(p->aio_send); + nni_aio_stop(p->aio_recv); + + nni_msgq_close(p->sendq); + + nni_mtx_lock(&s->mtx); + if (nni_list_active(&s->pipes, p)) { + nni_list_remove(&s->pipes, p); + } + nni_mtx_unlock(&s->mtx); +} + +static void +pub0_sock_getq_cb(void *arg) +{ + pub0_sock *s = arg; + nni_msgq * uwq = s->uwq; + nni_msg * msg, *dup; + + pub0_pipe *p; + pub0_pipe *last; + int rv; + + if (nni_aio_result(s->aio_getq) != 0) { + return; + } + + msg = nni_aio_get_msg(s->aio_getq); + nni_aio_set_msg(s->aio_getq, NULL); + + nni_mtx_lock(&s->mtx); + last = nni_list_last(&s->pipes); + NNI_LIST_FOREACH (&s->pipes, p) { + if (p != last) { + rv = nni_msg_dup(&dup, msg); + if (rv != 0) { + continue; + } + } else { + dup = msg; + } + if ((rv = nni_msgq_tryput(p->sendq, dup)) != 0) { + nni_msg_free(dup); + } + } + nni_mtx_unlock(&s->mtx); + + if (last == NULL) { + nni_msg_free(msg); + } + + nni_msgq_aio_get(uwq, s->aio_getq); +} + +static void +pub0_pipe_recv_cb(void *arg) +{ + pub0_pipe *p = arg; + + if (nni_aio_result(p->aio_recv) != 0) { + nni_pipe_stop(p->pipe); + return; + } + + nni_msg_free(nni_aio_get_msg(p->aio_recv)); + nni_aio_set_msg(p->aio_recv, NULL); + nni_pipe_recv(p->pipe, p->aio_recv); +} + +static void +pub0_pipe_getq_cb(void *arg) +{ + pub0_pipe *p = arg; + + if (nni_aio_result(p->aio_getq) != 0) { + nni_pipe_stop(p->pipe); + return; + } + + nni_aio_set_msg(p->aio_send, nni_aio_get_msg(p->aio_getq)); + nni_aio_set_msg(p->aio_getq, NULL); + + nni_pipe_send(p->pipe, p->aio_send); +} + +static void +pub0_pipe_send_cb(void *arg) +{ + pub0_pipe *p = arg; + + if (nni_aio_result(p->aio_send) != 0) { + nni_msg_free(nni_aio_get_msg(p->aio_send)); + nni_aio_set_msg(p->aio_send, NULL); + nni_pipe_stop(p->pipe); + return; + } + + nni_aio_set_msg(p->aio_send, NULL); + nni_msgq_aio_get(p->sendq, p->aio_getq); +} + +static int +pub0_sock_setopt_raw(void *arg, const void *buf, size_t sz) +{ + pub0_sock *s = arg; + return (nni_setopt_int(&s->raw, buf, sz, 0, 1)); +} + +static int +pub0_sock_getopt_raw(void *arg, void *buf, size_t *szp) +{ + pub0_sock *s = arg; + return (nni_getopt_int(s->raw, buf, szp)); +} + +static void +pub0_sock_recv(void *arg, nni_aio *aio) +{ + nni_aio_finish_error(aio, NNG_ENOTSUP); +} + +static void +pub0_sock_send(void *arg, nni_aio *aio) +{ + pub0_sock *s = arg; + + nni_msgq_aio_put(s->uwq, aio); +} + +static nni_proto_pipe_ops pub0_pipe_ops = { + .pipe_init = pub0_pipe_init, + .pipe_fini = pub0_pipe_fini, + .pipe_start = pub0_pipe_start, + .pipe_stop = pub0_pipe_stop, +}; + +static nni_proto_sock_option pub0_sock_options[] = { + { + .pso_name = NNG_OPT_RAW, + .pso_getopt = pub0_sock_getopt_raw, + .pso_setopt = pub0_sock_setopt_raw, + }, + // terminate list + { NULL, NULL, NULL }, +}; + +static nni_proto_sock_ops pub0_sock_ops = { + .sock_init = pub0_sock_init, + .sock_fini = pub0_sock_fini, + .sock_open = pub0_sock_open, + .sock_close = pub0_sock_close, + .sock_send = pub0_sock_send, + .sock_recv = pub0_sock_recv, + .sock_options = pub0_sock_options, +}; + +static nni_proto pub0_proto = { + .proto_version = NNI_PROTOCOL_VERSION, + .proto_self = { NNI_PROTO_PUB_V0, "pub" }, + .proto_peer = { NNI_PROTO_SUB_V0, "sub" }, + .proto_flags = NNI_PROTO_FLAG_SND, + .proto_sock_ops = &pub0_sock_ops, + .proto_pipe_ops = &pub0_pipe_ops, +}; + +int +nng_pub0_open(nng_socket *sidp) +{ + return (nni_proto_open(sidp, &pub0_proto)); +} diff --git a/src/protocol/pubsub0/pub.h b/src/protocol/pubsub0/pub.h new file mode 100644 index 00000000..2388a292 --- /dev/null +++ b/src/protocol/pubsub0/pub.h @@ -0,0 +1,28 @@ +// +// Copyright 2017 Garrett D'Amore <garrett@damore.org> +// Copyright 2017 Capitar IT Group BV <info@capitar.com> +// +// This software is supplied under the terms of the MIT License, a +// copy of which should be located in the distribution where this +// file was obtained (LICENSE.txt). A copy of the license may also be +// found online at https://opensource.org/licenses/MIT. +// + +#ifndef NNG_PROTOCOL_PUBSUB0_PUB_H +#define NNG_PROTOCOL_PUBSUB0_PUB_H + +#ifdef __cplusplus +extern "C" { +#endif + +NNG_DECL int nng_pub0_open(nng_socket *); + +#ifndef nng_pub_open +#define nng_pub_open nng_pub0_open +#endif + +#ifdef __cplusplus +} +#endif + +#endif // NNG_PROTOCOL_PUBSUB0_PUB_H diff --git a/src/protocol/pubsub0/sub.c b/src/protocol/pubsub0/sub.c new file mode 100644 index 00000000..6c504d75 --- /dev/null +++ b/src/protocol/pubsub0/sub.c @@ -0,0 +1,404 @@ +// +// Copyright 2017 Garrett D'Amore <garrett@damore.org> +// Copyright 2017 Capitar IT Group BV <info@capitar.com> +// +// This software is supplied under the terms of the MIT License, a +// copy of which should be located in the distribution where this +// file was obtained (LICENSE.txt). A copy of the license may also be +// found online at https://opensource.org/licenses/MIT. +// + +#include <stdlib.h> +#include <string.h> + +#include "core/nng_impl.h" +#include "protocol/pubsub0/sub.h" + +// Subscriber protocol. The SUB protocol receives messages sent to +// it from publishers, and filters out those it is not interested in, +// only passing up ones that match known subscriptions. + +#ifndef NNI_PROTO_SUB_V0 +#define NNI_PROTO_SUB_V0 NNI_PROTO(2, 1) +#endif + +#ifndef NNI_PROTO_PUB_V0 +#define NNI_PROTO_PUB_V0 NNI_PROTO(2, 0) +#endif + +typedef struct sub0_pipe sub0_pipe; +typedef struct sub0_sock sub0_sock; +typedef struct sub0_topic sub0_topic; + +static void sub0_recv_cb(void *); +static void sub0_putq_cb(void *); +static void sub0_pipe_fini(void *); + +struct sub0_topic { + nni_list_node node; + size_t len; + void * buf; +}; + +// sub0_sock is our per-socket protocol private structure. +struct sub0_sock { + nni_list topics; + nni_msgq *urq; + int raw; + nni_mtx lk; +}; + +// sub0_pipe is our per-pipe protocol private structure. +struct sub0_pipe { + nni_pipe * pipe; + sub0_sock *sub; + nni_aio * aio_recv; + nni_aio * aio_putq; +}; + +static int +sub0_sock_init(void **sp, nni_sock *sock) +{ + sub0_sock *s; + + if ((s = NNI_ALLOC_STRUCT(s)) == NULL) { + return (NNG_ENOMEM); + } + nni_mtx_init(&s->lk); + NNI_LIST_INIT(&s->topics, sub0_topic, node); + s->raw = 0; + + s->urq = nni_sock_recvq(sock); + *sp = s; + return (0); +} + +static void +sub0_sock_fini(void *arg) +{ + sub0_sock * s = arg; + sub0_topic *topic; + + while ((topic = nni_list_first(&s->topics)) != NULL) { + nni_list_remove(&s->topics, topic); + nni_free(topic->buf, topic->len); + NNI_FREE_STRUCT(topic); + } + nni_mtx_fini(&s->lk); + NNI_FREE_STRUCT(s); +} + +static void +sub0_sock_open(void *arg) +{ + NNI_ARG_UNUSED(arg); +} + +static void +sub0_sock_close(void *arg) +{ + NNI_ARG_UNUSED(arg); +} + +static void +sub0_pipe_fini(void *arg) +{ + sub0_pipe *p = arg; + + nni_aio_fini(p->aio_putq); + nni_aio_fini(p->aio_recv); + NNI_FREE_STRUCT(p); +} + +static int +sub0_pipe_init(void **pp, nni_pipe *pipe, void *s) +{ + sub0_pipe *p; + int rv; + + if ((p = NNI_ALLOC_STRUCT(p)) == NULL) { + return (NNG_ENOMEM); + } + if (((rv = nni_aio_init(&p->aio_putq, sub0_putq_cb, p)) != 0) || + ((rv = nni_aio_init(&p->aio_recv, sub0_recv_cb, p)) != 0)) { + sub0_pipe_fini(p); + return (rv); + } + + p->pipe = pipe; + p->sub = s; + *pp = p; + return (0); +} + +static int +sub0_pipe_start(void *arg) +{ + sub0_pipe *p = arg; + + nni_pipe_recv(p->pipe, p->aio_recv); + return (0); +} + +static void +sub0_pipe_stop(void *arg) +{ + sub0_pipe *p = arg; + + nni_aio_stop(p->aio_putq); + nni_aio_stop(p->aio_recv); +} + +static void +sub0_recv_cb(void *arg) +{ + sub0_pipe *p = arg; + sub0_sock *s = p->sub; + nni_msgq * urq = s->urq; + nni_msg * msg; + + if (nni_aio_result(p->aio_recv) != 0) { + nni_pipe_stop(p->pipe); + return; + } + + msg = nni_aio_get_msg(p->aio_recv); + nni_aio_set_msg(p->aio_recv, NULL); + nni_msg_set_pipe(msg, nni_pipe_id(p->pipe)); + nni_aio_set_msg(p->aio_putq, msg); + nni_msgq_aio_put(urq, p->aio_putq); +} + +static void +sub0_putq_cb(void *arg) +{ + sub0_pipe *p = arg; + + if (nni_aio_result(p->aio_putq) != 0) { + nni_msg_free(nni_aio_get_msg(p->aio_putq)); + nni_aio_set_msg(p->aio_putq, NULL); + nni_pipe_stop(p->pipe); + return; + } + + nni_pipe_recv(p->pipe, p->aio_recv); +} + +// For now we maintain subscriptions on a sorted linked list. As we do not +// expect to have huge numbers of subscriptions, and as the operation is +// really O(n), we think this is acceptable. In the future we might decide +// to replace this with a patricia trie, like old nanomsg had. + +static int +sub0_subscribe(void *arg, const void *buf, size_t sz) +{ + sub0_sock * s = arg; + sub0_topic *topic; + sub0_topic *newtopic; + + nni_mtx_lock(&s->lk); + NNI_LIST_FOREACH (&s->topics, topic) { + int rv; + + if (topic->len >= sz) { + rv = memcmp(topic->buf, buf, sz); + } else { + rv = memcmp(topic->buf, buf, topic->len); + } + if (rv == 0) { + if (topic->len == sz) { + // Already inserted. + nni_mtx_unlock(&s->lk); + return (0); + } + if (topic->len > sz) { + break; + } + } else if (rv > 0) { + break; + } + } + + if ((newtopic = NNI_ALLOC_STRUCT(newtopic)) == NULL) { + nni_mtx_unlock(&s->lk); + return (NNG_ENOMEM); + } + if ((newtopic->buf = nni_alloc(sz)) == NULL) { + nni_mtx_unlock(&s->lk); + return (NNG_ENOMEM); + } + NNI_LIST_NODE_INIT(&newtopic->node); + newtopic->len = sz; + memcpy(newtopic->buf, buf, sz); + if (topic != NULL) { + nni_list_insert_before(&s->topics, newtopic, topic); + } else { + nni_list_append(&s->topics, newtopic); + } + nni_mtx_unlock(&s->lk); + return (0); +} + +static int +sub0_unsubscribe(void *arg, const void *buf, size_t sz) +{ + sub0_sock * s = arg; + sub0_topic *topic; + int rv; + + nni_mtx_lock(&s->lk); + NNI_LIST_FOREACH (&s->topics, topic) { + if (topic->len >= sz) { + rv = memcmp(topic->buf, buf, sz); + } else { + rv = memcmp(topic->buf, buf, topic->len); + } + if (rv == 0) { + if (topic->len == sz) { + nni_list_remove(&s->topics, topic); + nni_mtx_unlock(&s->lk); + nni_free(topic->buf, topic->len); + NNI_FREE_STRUCT(topic); + return (0); + } + if (topic->len > sz) { + nni_mtx_unlock(&s->lk); + return (NNG_ENOENT); + } + } + if (rv > 0) { + nni_mtx_unlock(&s->lk); + return (NNG_ENOENT); + } + } + nni_mtx_unlock(&s->lk); + return (NNG_ENOENT); +} + +static int +sub0_sock_setopt_raw(void *arg, const void *buf, size_t sz) +{ + sub0_sock *s = arg; + return (nni_setopt_int(&s->raw, buf, sz, 0, 1)); +} + +static int +sub0_sock_getopt_raw(void *arg, void *buf, size_t *szp) +{ + sub0_sock *s = arg; + return (nni_getopt_int(s->raw, buf, szp)); +} + +static void +sub0_sock_send(void *arg, nni_aio *aio) +{ + nni_aio_finish_error(aio, NNG_ENOTSUP); +} + +static void +sub0_sock_recv(void *arg, nni_aio *aio) +{ + sub0_sock *s = arg; + + nni_msgq_aio_get(s->urq, aio); +} + +static nni_msg * +sub0_sock_filter(void *arg, nni_msg *msg) +{ + sub0_sock * s = arg; + sub0_topic *topic; + char * body; + size_t len; + int match; + + nni_mtx_lock(&s->lk); + if (s->raw) { + nni_mtx_unlock(&s->lk); + return (msg); + } + + body = nni_msg_body(msg); + len = nni_msg_len(msg); + + match = 0; + // Check to see if the message matches one of our subscriptions. + NNI_LIST_FOREACH (&s->topics, topic) { + if (len >= topic->len) { + int rv = memcmp(topic->buf, body, topic->len); + if (rv == 0) { + // Matched! + match = 1; + break; + } + if (rv > 0) { + match = 0; + break; + } + } else if (memcmp(topic->buf, body, len) >= 0) { + match = 0; + break; + } + } + nni_mtx_unlock(&s->lk); + if (!match) { + nni_msg_free(msg); + return (NULL); + } + return (msg); +} + +// This is the global protocol structure -- our linkage to the core. +// This should be the only global non-static symbol in this file. +static nni_proto_pipe_ops sub0_pipe_ops = { + .pipe_init = sub0_pipe_init, + .pipe_fini = sub0_pipe_fini, + .pipe_start = sub0_pipe_start, + .pipe_stop = sub0_pipe_stop, +}; + +static nni_proto_sock_option sub0_sock_options[] = { + { + .pso_name = NNG_OPT_RAW, + .pso_getopt = sub0_sock_getopt_raw, + .pso_setopt = sub0_sock_setopt_raw, + }, + { + .pso_name = NNG_OPT_SUB_SUBSCRIBE, + .pso_getopt = NULL, + .pso_setopt = sub0_subscribe, + }, + { + .pso_name = NNG_OPT_SUB_UNSUBSCRIBE, + .pso_getopt = NULL, + .pso_setopt = sub0_unsubscribe, + }, + // terminate list + { NULL, NULL, NULL }, +}; + +static nni_proto_sock_ops sub0_sock_ops = { + .sock_init = sub0_sock_init, + .sock_fini = sub0_sock_fini, + .sock_open = sub0_sock_open, + .sock_close = sub0_sock_close, + .sock_send = sub0_sock_send, + .sock_recv = sub0_sock_recv, + .sock_filter = sub0_sock_filter, + .sock_options = sub0_sock_options, +}; + +static nni_proto sub0_proto = { + .proto_version = NNI_PROTOCOL_VERSION, + .proto_self = { NNI_PROTO_SUB_V0, "sub" }, + .proto_peer = { NNI_PROTO_PUB_V0, "pub" }, + .proto_flags = NNI_PROTO_FLAG_RCV, + .proto_sock_ops = &sub0_sock_ops, + .proto_pipe_ops = &sub0_pipe_ops, +}; + +int +nng_sub0_open(nng_socket *sidp) +{ + return (nni_proto_open(sidp, &sub0_proto)); +} diff --git a/src/protocol/pubsub0/sub.h b/src/protocol/pubsub0/sub.h new file mode 100644 index 00000000..1a09145d --- /dev/null +++ b/src/protocol/pubsub0/sub.h @@ -0,0 +1,31 @@ +// +// Copyright 2017 Garrett D'Amore <garrett@damore.org> +// Copyright 2017 Capitar IT Group BV <info@capitar.com> +// +// This software is supplied under the terms of the MIT License, a +// copy of which should be located in the distribution where this +// file was obtained (LICENSE.txt). A copy of the license may also be +// found online at https://opensource.org/licenses/MIT. +// + +#ifndef NNG_PROTOCOL_PUBSUB0_SUB_H +#define NNG_PROTOCOL_PUBSUB0_SUB_H + +#ifdef __cplusplus +extern "C" { +#endif + +NNG_DECL int nng_sub0_open(nng_socket *); + +#ifndef nng_sub_open +#define nng_sub_open nng_sub0_open +#endif + +#define NNG_OPT_SUB_SUBSCRIBE "sub:subscribe" +#define NNG_OPT_SUB_UNSUBSCRIBE "sub:unsubscribe" + +#ifdef __cplusplus +} +#endif + +#endif // NNG_PROTOCOL_PUBSUB0_SUB_H |