len:发送/接收数据的长度。 flags:标志位,常用的有0(默认)和MSG_DONTWAIT(非阻塞)。 关闭连接 在与服务器的通信结束后,应该关闭连接,释放资源。使用lwIP提供的close函数关闭socket。示例代码如下: int close(int sockfd); sockfd:socket描述符,通过socket函数返回的值。
- MSG_DONTWAIT:非阻塞发送,即发送函数立即返回,不等待发送完成。 - MSG_MORE:表示数据还未发送完毕,后续还有数据要发送。 lwip send函数返回值为err_t类型,用于表示发送是否成功。如果返回值为ERR_OK表示发送成功,否则表示发送失败。发送失败的原因可能是网络连接断开、发送缓冲区已满等。 在使用lwip send函数时,...
>> length = lwip_recvfrom(socket_fd, (char *) msg_buf, >> sizeof(msg_buf), >> MSG_DONTWAIT, (struct sockaddr *)&sa, &size); >> >> if(length > 0) >> { >> sMsg = (NET_MSG *) (msg_buf); >> mon_cmd_do(socket_fd, &sa, sMsg, length); >> } >> >> lwip_close(...
内核bits/socket.h: #define MSG_PEEK 0x02 #define MSG_WAITALL 0x100 #define MSG_OOB 0x01 #define MSG_DONTWAIT 0x40 #define MSG_MORE 0x8000 #define MSG_NOSIGNAL 0x4000 lwip中sockets.h: #define MSG_PEEK 0x01 /* Peeks at an incoming message/ #define MSG_WAITALL 0x02 /Unimplemented: ...
0141-recv-support-MSG_DONTWAIT.patch 0142-do_setsockopt-function-no-longer... 0143-FAUT-INJECT-add-fault-inject-uns... 0144-support-udp-pkglen-mtu.patch 0145-add-limit-with-level-for-sockopt... 0146-udp-add-restriction-message-too-... ...
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((flags & MSG_DONTWAIT) ? NETCONN_DONTBLOCK : 0); written = 0; err = netconn_write_partly(sock->conn, data, size, write_flags, &written);LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_send(%d) err=%d written=%"SZT_F"\n", s, err, written)); ...
//rc = recv( socket, ptr, 1,MSG_DONTWAIT);if ( rc <= 0 ) return rc;if ( (*ptr == ...
(netPath->eventSock, buf, PACKET_SIZE, MSG_DONTWAIT); if (ret <= 0) { if (errno == EAGAIN || errno == EINTR) return 0; return ret; } return ret; } Both the netSentEvent() and netSentPeerEvent() functions send the frame of corresponding event message and return the frame's ...
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