/* * * Copyright 2015 gRPC authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * */ /* FIXME: "posix" files shouldn't be depending on _GNU_SOURCE */ #ifndef _GNU_SOURCE #define _GNU_SOURCE #endif #ifndef SO_RXQ_OVFL #define SO_RXQ_OVFL 40 #endif #include #include "src/core/lib/iomgr/port.h" #ifdef GRPC_POSIX_SOCKET #include "src/core/lib/iomgr/udp_server.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "src/core/lib/channel/channel_args.h" #include "src/core/lib/gpr/string.h" #include "src/core/lib/gprpp/inlined_vector.h" #include "src/core/lib/gprpp/memory.h" #include "src/core/lib/iomgr/error.h" #include "src/core/lib/iomgr/ev_posix.h" #include "src/core/lib/iomgr/executor.h" #include "src/core/lib/iomgr/resolve_address.h" #include "src/core/lib/iomgr/sockaddr.h" #include "src/core/lib/iomgr/sockaddr_utils.h" #include "src/core/lib/iomgr/socket_factory_posix.h" #include "src/core/lib/iomgr/socket_utils_posix.h" #include "src/core/lib/iomgr/unix_sockets_posix.h" /* A listener which implements basic features of Listening on a port for * I/O events*/ class GrpcUdpListener { public: GrpcUdpListener(grpc_udp_server* server, int fd, const grpc_resolved_address* addr); ~GrpcUdpListener(); /* Called when grpc server starts to listening on the grpc_fd. */ void StartListening(grpc_pollset** pollsets, size_t pollset_count, GrpcUdpHandlerFactory* handler_factory); /* Called when data is available to read from the socket. * Return true if there is more data to read from fd. */ void OnRead(grpc_error* error, void* do_read_arg); /* Called when the socket is writeable. The given closure should be scheduled * when the socket becomes blocked next time. */ void OnCanWrite(grpc_error* error, void* do_write_arg); /* Called when the grpc_fd is about to be orphaned (and the FD closed). */ void OnFdAboutToOrphan(); /* Called to orphan fd of this listener.*/ void OrphanFd(); /* Called when this listener is going to be destroyed. */ void OnDestroy(); int fd() const { return fd_; } protected: grpc_fd* emfd() const { return emfd_; } gpr_mu* mutex() { return &mutex_; } private: /* event manager callback when reads are ready */ static void on_read(void* arg, grpc_error* error); static void on_write(void* arg, grpc_error* error); static void do_read(void* arg, grpc_error* error); static void do_write(void* arg, grpc_error* error); // Wrapper of grpc_fd_notify_on_write() with a grpc_closure callback // interface. static void fd_notify_on_write_wrapper(void* arg, grpc_error* error); static void shutdown_fd(void* args, grpc_error* error); int fd_; grpc_fd* emfd_; grpc_udp_server* server_; grpc_resolved_address addr_; grpc_closure read_closure_; grpc_closure write_closure_; // To be called when corresponding QuicGrpcServer closes all active // connections. grpc_closure orphan_fd_closure_; grpc_closure destroyed_closure_; // To be scheduled on another thread to actually read/write. grpc_closure do_read_closure_; grpc_closure do_write_closure_; grpc_closure notify_on_write_closure_; // True if orphan_cb is trigered. bool orphan_notified_; // True if grpc_fd_notify_on_write() is called after on_write() call. bool notify_on_write_armed_; // True if fd has been shutdown. bool already_shutdown_; // Object actually handles I/O events. Assigned in StartListening(). GrpcUdpHandler* udp_handler_ = nullptr; // To be notified on destruction. GrpcUdpHandlerFactory* handler_factory_ = nullptr; // Required to access above fields. gpr_mu mutex_; }; GrpcUdpListener::GrpcUdpListener(grpc_udp_server* server, int fd, const grpc_resolved_address* addr) : fd_(fd), server_(server), orphan_notified_(false), already_shutdown_(false) { char* addr_str; char* name; grpc_sockaddr_to_string(&addr_str, addr, 1); gpr_asprintf(&name, "udp-server-listener:%s", addr_str); gpr_free(addr_str); emfd_ = grpc_fd_create(fd, name, true); memcpy(&addr_, addr, sizeof(grpc_resolved_address)); GPR_ASSERT(emfd_); gpr_free(name); gpr_mu_init(&mutex_); } GrpcUdpListener::~GrpcUdpListener() { gpr_mu_destroy(&mutex_); } /* the overall server */ struct grpc_udp_server { gpr_mu mu; /* factory to use for creating and binding sockets, or NULL */ grpc_socket_factory* socket_factory; /* active port count: how many ports are actually still listening */ size_t active_ports; /* destroyed port count: how many ports are completely destroyed */ size_t destroyed_ports; /* is this server shutting down? (boolean) */ int shutdown; /* An array of listeners */ grpc_core::InlinedVector listeners; /* factory for use to create udp listeners */ GrpcUdpHandlerFactory* handler_factory; /* shutdown callback */ grpc_closure* shutdown_complete; /* all pollsets interested in new connections */ grpc_pollset** pollsets; /* number of pollsets in the pollsets array */ size_t pollset_count; /* opaque object to pass to callbacks */ void* user_data; /* latch has_so_reuseport during server creation */ bool so_reuseport; }; static grpc_socket_factory* get_socket_factory(const grpc_channel_args* args) { if (args) { const grpc_arg* arg = grpc_channel_args_find(args, GRPC_ARG_SOCKET_FACTORY); if (arg) { GPR_ASSERT(arg->type == GRPC_ARG_POINTER); return static_cast(arg->value.pointer.p); } } return nullptr; } grpc_udp_server* grpc_udp_server_create(const grpc_channel_args* args) { grpc_udp_server* s = grpc_core::New(); gpr_mu_init(&s->mu); s->socket_factory = get_socket_factory(args); if (s->socket_factory) { grpc_socket_factory_ref(s->socket_factory); } s->active_ports = 0; s->destroyed_ports = 0; s->shutdown = 0; s->so_reuseport = grpc_is_socket_reuse_port_supported(); return s; } // static void GrpcUdpListener::shutdown_fd(void* args, grpc_error* error) { if (args == nullptr) { // No-op if shutdown args are null. return; } auto sp = static_cast(args); gpr_mu_lock(sp->mutex()); gpr_log(GPR_DEBUG, "shutdown fd %d", sp->fd_); grpc_fd_shutdown(sp->emfd_, GRPC_ERROR_REF(error)); sp->already_shutdown_ = true; if (!sp->notify_on_write_armed_) { // Re-arm write notification to notify listener with error. This is // necessary to decrement active_ports. sp->notify_on_write_armed_ = true; grpc_fd_notify_on_write(sp->emfd_, &sp->write_closure_); } gpr_mu_unlock(sp->mutex()); } static void finish_shutdown(grpc_udp_server* s) { if (s->shutdown_complete != nullptr) { GRPC_CLOSURE_SCHED(s->shutdown_complete, GRPC_ERROR_NONE); } gpr_mu_destroy(&s->mu); gpr_log(GPR_DEBUG, "Destroy all listeners."); for (size_t i = 0; i < s->listeners.size(); ++i) { s->listeners[i].OnDestroy(); } if (s->socket_factory) { grpc_socket_factory_unref(s->socket_factory); } grpc_core::Delete(s); } static void destroyed_port(void* server, grpc_error* error) { grpc_udp_server* s = static_cast(server); gpr_mu_lock(&s->mu); s->destroyed_ports++; if (s->destroyed_ports == s->listeners.size()) { gpr_mu_unlock(&s->mu); finish_shutdown(s); } else { gpr_mu_unlock(&s->mu); } } /* called when all listening endpoints have been shutdown, so no further events will be received on them - at this point it's safe to destroy things */ static void deactivated_all_ports(grpc_udp_server* s) { /* delete ALL the things */ gpr_mu_lock(&s->mu); GPR_ASSERT(s->shutdown); if (s->listeners.size() == 0) { gpr_mu_unlock(&s->mu); finish_shutdown(s); return; } for (size_t i = 0; i < s->listeners.size(); ++i) { s->listeners[i].OrphanFd(); } gpr_mu_unlock(&s->mu); } void GrpcUdpListener::OrphanFd() { gpr_log(GPR_DEBUG, "Orphan fd %d, emfd %p", fd_, emfd_); grpc_unlink_if_unix_domain_socket(&addr_); GRPC_CLOSURE_INIT(&destroyed_closure_, destroyed_port, server_, grpc_schedule_on_exec_ctx); /* Because at this point, all listening sockets have been shutdown already, no * need to call OnFdAboutToOrphan() to notify the handler again. */ grpc_fd_orphan(emfd_, &destroyed_closure_, nullptr, "udp_listener_shutdown"); } void grpc_udp_server_destroy(grpc_udp_server* s, grpc_closure* on_done) { gpr_mu_lock(&s->mu); GPR_ASSERT(!s->shutdown); s->shutdown = 1; s->shutdown_complete = on_done; gpr_log(GPR_DEBUG, "start to destroy udp_server"); /* shutdown all fd's */ if (s->active_ports) { for (size_t i = 0; i < s->listeners.size(); ++i) { GrpcUdpListener* sp = &s->listeners[i]; sp->OnFdAboutToOrphan(); } gpr_mu_unlock(&s->mu); } else { gpr_mu_unlock(&s->mu); deactivated_all_ports(s); } } void GrpcUdpListener::OnFdAboutToOrphan() { gpr_mu_lock(&mutex_); grpc_unlink_if_unix_domain_socket(&addr_); GRPC_CLOSURE_INIT(&destroyed_closure_, destroyed_port, server_, grpc_schedule_on_exec_ctx); if (!orphan_notified_ && udp_handler_ != nullptr) { /* Singals udp_handler that the FD is about to be closed and * should no longer be used. */ GRPC_CLOSURE_INIT(&orphan_fd_closure_, shutdown_fd, this, grpc_schedule_on_exec_ctx); gpr_log(GPR_DEBUG, "fd %d about to be orphaned", fd_); udp_handler_->OnFdAboutToOrphan(&orphan_fd_closure_, server_->user_data); orphan_notified_ = true; } gpr_mu_unlock(&mutex_); } static int bind_socket(grpc_socket_factory* socket_factory, int sockfd, const grpc_resolved_address* addr) { return (socket_factory != nullptr) ? grpc_socket_factory_bind(socket_factory, sockfd, addr) : bind(sockfd, reinterpret_cast( const_cast(addr->addr)), addr->len); } /* Prepare a recently-created socket for listening. */ static int prepare_socket(grpc_socket_factory* socket_factory, int fd, const grpc_resolved_address* addr, int rcv_buf_size, int snd_buf_size, bool so_reuseport) { grpc_resolved_address sockname_temp; grpc_sockaddr* addr_ptr = reinterpret_cast(const_cast(addr->addr)); if (fd < 0) { goto error; } if (grpc_set_socket_nonblocking(fd, 1) != GRPC_ERROR_NONE) { gpr_log(GPR_ERROR, "Unable to set nonblocking %d: %s", fd, strerror(errno)); goto error; } if (grpc_set_socket_cloexec(fd, 1) != GRPC_ERROR_NONE) { gpr_log(GPR_ERROR, "Unable to set cloexec %d: %s", fd, strerror(errno)); goto error; } if (grpc_set_socket_ip_pktinfo_if_possible(fd) != GRPC_ERROR_NONE) { gpr_log(GPR_ERROR, "Unable to set ip_pktinfo."); goto error; } else if (addr_ptr->sa_family == AF_INET6) { if (grpc_set_socket_ipv6_recvpktinfo_if_possible(fd) != GRPC_ERROR_NONE) { gpr_log(GPR_ERROR, "Unable to set ipv6_recvpktinfo."); goto error; } } if (grpc_set_socket_sndbuf(fd, snd_buf_size) != GRPC_ERROR_NONE) { gpr_log(GPR_ERROR, "Failed to set send buffer size to %d bytes", snd_buf_size); goto error; } if (grpc_set_socket_rcvbuf(fd, rcv_buf_size) != GRPC_ERROR_NONE) { gpr_log(GPR_ERROR, "Failed to set receive buffer size to %d bytes", rcv_buf_size); goto error; } { int get_overflow = 1; if (0 != setsockopt(fd, SOL_SOCKET, SO_RXQ_OVFL, &get_overflow, sizeof(get_overflow))) { gpr_log(GPR_INFO, "Failed to set socket overflow support"); } } if (so_reuseport && !grpc_is_unix_socket(addr) && grpc_set_socket_reuse_port(fd, 1) != GRPC_ERROR_NONE) { gpr_log(GPR_ERROR, "Failed to set SO_REUSEPORT for fd %d", fd); goto error; } if (bind_socket(socket_factory, fd, addr) < 0) { char* addr_str; grpc_sockaddr_to_string(&addr_str, addr, 0); gpr_log(GPR_ERROR, "bind addr=%s: %s", addr_str, strerror(errno)); gpr_free(addr_str); goto error; } sockname_temp.len = static_cast(sizeof(struct sockaddr_storage)); if (getsockname(fd, reinterpret_cast(sockname_temp.addr), &sockname_temp.len) < 0) { gpr_log(GPR_ERROR, "Unable to get the address socket %d is bound to: %s", fd, strerror(errno)); goto error; } return grpc_sockaddr_get_port(&sockname_temp); error: if (fd >= 0) { close(fd); } return -1; } // static void GrpcUdpListener::do_read(void* arg, grpc_error* error) { GrpcUdpListener* sp = static_cast(arg); GPR_ASSERT(error == GRPC_ERROR_NONE); /* TODO: the reason we hold server->mu here is merely to prevent fd * shutdown while we are reading. However, it blocks do_write(). Switch to * read lock if available. */ gpr_mu_lock(sp->mutex()); /* Tell the registered callback that data is available to read. */ if (!sp->already_shutdown_ && sp->udp_handler_->Read()) { /* There maybe more packets to read. Schedule read_more_cb_ closure to run * after finishing this event loop. */ GRPC_CLOSURE_SCHED(&sp->do_read_closure_, GRPC_ERROR_NONE); } else { /* Finish reading all the packets, re-arm the notification event so we can * get another chance to read. Or fd already shutdown, re-arm to get a * notification with shutdown error. */ grpc_fd_notify_on_read(sp->emfd_, &sp->read_closure_); } gpr_mu_unlock(sp->mutex()); } // static void GrpcUdpListener::on_read(void* arg, grpc_error* error) { GrpcUdpListener* sp = static_cast(arg); sp->OnRead(error, arg); } void GrpcUdpListener::OnRead(grpc_error* error, void* do_read_arg) { if (error != GRPC_ERROR_NONE) { gpr_mu_lock(&server_->mu); if (0 == --server_->active_ports && server_->shutdown) { gpr_mu_unlock(&server_->mu); deactivated_all_ports(server_); } else { gpr_mu_unlock(&server_->mu); } return; } /* Read once. If there is more data to read, off load the work to another * thread to finish. */ if (udp_handler_->Read()) { /* There maybe more packets to read. Schedule read_more_cb_ closure to run * after finishing this event loop. */ GRPC_CLOSURE_INIT(&do_read_closure_, do_read, do_read_arg, grpc_executor_scheduler(GRPC_EXECUTOR_LONG)); GRPC_CLOSURE_SCHED(&do_read_closure_, GRPC_ERROR_NONE); } else { /* Finish reading all the packets, re-arm the notification event so we can * get another chance to read. Or fd already shutdown, re-arm to get a * notification with shutdown error. */ grpc_fd_notify_on_read(emfd_, &read_closure_); } } // static // Wrapper of grpc_fd_notify_on_write() with a grpc_closure callback interface. void GrpcUdpListener::fd_notify_on_write_wrapper(void* arg, grpc_error* error) { GrpcUdpListener* sp = static_cast(arg); gpr_mu_lock(sp->mutex()); if (!sp->notify_on_write_armed_) { grpc_fd_notify_on_write(sp->emfd_, &sp->write_closure_); sp->notify_on_write_armed_ = true; } gpr_mu_unlock(sp->mutex()); } // static void GrpcUdpListener::do_write(void* arg, grpc_error* error) { GrpcUdpListener* sp = static_cast(arg); gpr_mu_lock(sp->mutex()); if (sp->already_shutdown_) { // If fd has been shutdown, don't write any more and re-arm notification. grpc_fd_notify_on_write(sp->emfd_, &sp->write_closure_); } else { sp->notify_on_write_armed_ = false; /* Tell the registered callback that the socket is writeable. */ GPR_ASSERT(error == GRPC_ERROR_NONE); GRPC_CLOSURE_INIT(&sp->notify_on_write_closure_, fd_notify_on_write_wrapper, arg, grpc_schedule_on_exec_ctx); sp->udp_handler_->OnCanWrite(sp->server_->user_data, &sp->notify_on_write_closure_); } gpr_mu_unlock(sp->mutex()); } // static void GrpcUdpListener::on_write(void* arg, grpc_error* error) { GrpcUdpListener* sp = static_cast(arg); sp->OnCanWrite(error, arg); } void GrpcUdpListener::OnCanWrite(grpc_error* error, void* do_write_arg) { if (error != GRPC_ERROR_NONE) { gpr_mu_lock(&server_->mu); if (0 == --server_->active_ports && server_->shutdown) { gpr_mu_unlock(&server_->mu); deactivated_all_ports(server_); } else { gpr_mu_unlock(&server_->mu); } return; } /* Schedule actual write in another thread. */ GRPC_CLOSURE_INIT(&do_write_closure_, do_write, do_write_arg, grpc_executor_scheduler(GRPC_EXECUTOR_LONG)); GRPC_CLOSURE_SCHED(&do_write_closure_, GRPC_ERROR_NONE); } static int add_socket_to_server(grpc_udp_server* s, int fd, const grpc_resolved_address* addr, int rcv_buf_size, int snd_buf_size) { gpr_log(GPR_DEBUG, "add socket %d to server", fd); int port = prepare_socket(s->socket_factory, fd, addr, rcv_buf_size, snd_buf_size, s->so_reuseport); if (port >= 0) { gpr_mu_lock(&s->mu); s->listeners.emplace_back(s, fd, addr); gpr_log(GPR_DEBUG, "add socket %d to server for port %d, %zu listener(s) in total", fd, port, s->listeners.size()); gpr_mu_unlock(&s->mu); } return port; } int grpc_udp_server_add_port(grpc_udp_server* s, const grpc_resolved_address* addr, int rcv_buf_size, int snd_buf_size, GrpcUdpHandlerFactory* handler_factory, size_t num_listeners) { if (num_listeners > 1 && !s->so_reuseport) { gpr_log(GPR_ERROR, "Try to have multiple listeners on same port, but SO_REUSEPORT is " "not supported. Only create 1 listener."); } char* addr_str; grpc_sockaddr_to_string(&addr_str, addr, 1); gpr_log(GPR_DEBUG, "add address: %s to server", addr_str); gpr_free(addr_str); int allocated_port1 = -1; int allocated_port2 = -1; int fd; grpc_dualstack_mode dsmode; grpc_resolved_address addr6_v4mapped; grpc_resolved_address wild4; grpc_resolved_address wild6; grpc_resolved_address addr4_copy; grpc_resolved_address* allocated_addr = nullptr; grpc_resolved_address sockname_temp; int port = 0; /* Check if this is a wildcard port, and if so, try to keep the port the same as some previously created listener. */ if (grpc_sockaddr_get_port(addr) == 0) { /* Loop through existing listeners to find the port in use. */ for (size_t i = 0; i < s->listeners.size(); ++i) { sockname_temp.len = static_cast(sizeof(struct sockaddr_storage)); if (0 == getsockname(s->listeners[i].fd(), reinterpret_cast(sockname_temp.addr), &sockname_temp.len)) { port = grpc_sockaddr_get_port(&sockname_temp); if (port > 0) { /* Found such a port, update |addr| to reflects this port. */ allocated_addr = static_cast( gpr_malloc(sizeof(grpc_resolved_address))); memcpy(allocated_addr, addr, sizeof(grpc_resolved_address)); grpc_sockaddr_set_port(allocated_addr, port); addr = allocated_addr; break; } } } } if (grpc_sockaddr_to_v4mapped(addr, &addr6_v4mapped)) { addr = &addr6_v4mapped; } s->handler_factory = handler_factory; for (size_t i = 0; i < num_listeners; ++i) { /* Treat :: or 0.0.0.0 as a family-agnostic wildcard. */ if (grpc_sockaddr_is_wildcard(addr, &port)) { grpc_sockaddr_make_wildcards(port, &wild4, &wild6); /* Try listening on IPv6 first. */ addr = &wild6; // TODO(rjshade): Test and propagate the returned grpc_error*: GRPC_ERROR_UNREF(grpc_create_dualstack_socket_using_factory( s->socket_factory, addr, SOCK_DGRAM, IPPROTO_UDP, &dsmode, &fd)); allocated_port1 = add_socket_to_server(s, fd, addr, rcv_buf_size, snd_buf_size); if (fd >= 0 && dsmode == GRPC_DSMODE_DUALSTACK) { if (port == 0) { /* This is the first time to bind to |addr|. If its port is still * wildcard port, update |addr| with the ephermeral port returned by * kernel. Thus |addr| can have a specific port in following * iterations. */ grpc_sockaddr_set_port(addr, allocated_port1); port = allocated_port1; } else if (allocated_port1 >= 0) { /* The following sucessfully created socket should have same port as * the first one. */ GPR_ASSERT(port == allocated_port1); } /* A dualstack socket is created, no need to create corresponding IPV4 * socket. */ continue; } /* If we didn't get a dualstack socket, also listen on 0.0.0.0. */ if (port == 0 && allocated_port1 > 0) { /* |port| hasn't been assigned to an emphemeral port yet, |wild4| must * have a wildcard port. Update it with the emphemeral port created * during binding.*/ grpc_sockaddr_set_port(&wild4, allocated_port1); port = allocated_port1; } /* |wild4| should have been updated with an emphemeral port by now. Use * this IPV4 address to create a IPV4 socket. */ addr = &wild4; } // TODO(rjshade): Test and propagate the returned grpc_error*: GRPC_ERROR_UNREF(grpc_create_dualstack_socket_using_factory( s->socket_factory, addr, SOCK_DGRAM, IPPROTO_UDP, &dsmode, &fd)); if (fd < 0) { gpr_log(GPR_ERROR, "Unable to create socket: %s", strerror(errno)); } if (dsmode == GRPC_DSMODE_IPV4 && grpc_sockaddr_is_v4mapped(addr, &addr4_copy)) { addr = &addr4_copy; } allocated_port2 = add_socket_to_server(s, fd, addr, rcv_buf_size, snd_buf_size); if (port == 0) { /* Update |addr| with the ephermeral port returned by kernel. So |addr| * can have a specific port in following iterations. */ grpc_sockaddr_set_port(addr, allocated_port2); port = allocated_port2; } else if (allocated_port2 >= 0) { GPR_ASSERT(port == allocated_port2); } } gpr_free(allocated_addr); return port; } int grpc_udp_server_get_fd(grpc_udp_server* s, unsigned port_index) { if (port_index >= s->listeners.size()) { return -1; } return s->listeners[port_index].fd(); } void grpc_udp_server_start(grpc_udp_server* s, grpc_pollset** pollsets, size_t pollset_count, void* user_data) { gpr_log(GPR_DEBUG, "grpc_udp_server_start"); gpr_mu_lock(&s->mu); GPR_ASSERT(s->active_ports == 0); s->pollsets = pollsets; s->user_data = user_data; for (size_t i = 0; i < s->listeners.size(); ++i) { s->listeners[i].StartListening(pollsets, pollset_count, s->handler_factory); } gpr_mu_unlock(&s->mu); } void GrpcUdpListener::StartListening(grpc_pollset** pollsets, size_t pollset_count, GrpcUdpHandlerFactory* handler_factory) { gpr_mu_lock(&mutex_); handler_factory_ = handler_factory; udp_handler_ = handler_factory->CreateUdpHandler(emfd_, server_->user_data); for (size_t i = 0; i < pollset_count; i++) { grpc_pollset_add_fd(pollsets[i], emfd_); } GRPC_CLOSURE_INIT(&read_closure_, on_read, this, grpc_schedule_on_exec_ctx); grpc_fd_notify_on_read(emfd_, &read_closure_); GRPC_CLOSURE_INIT(&write_closure_, on_write, this, grpc_schedule_on_exec_ctx); notify_on_write_armed_ = true; grpc_fd_notify_on_write(emfd_, &write_closure_); /* Registered for both read and write callbacks: increment active_ports * twice to account for this, and delay free-ing of memory until both * on_read and on_write have fired. */ server_->active_ports += 2; gpr_mu_unlock(&mutex_); } void GrpcUdpListener::OnDestroy() { if (udp_handler_ != nullptr) { handler_factory_->DestroyUdpHandler(udp_handler_); } } #endif