网络编程之路---7

来源：互联网发布：义乌有没有淘宝培训编辑：程序博客网时间：2024/06/11 07:29

int getsockopt(SOCKET s, int level, int optname, char *optbal, int *optlen);

sockt描述符选项所在的协议层需要访问的选项名返回选项值的缓冲作为入口参数时，选项值的最大长度，作为出口参数时，选项值的实际长度

#include <stdlib.h>#include <stdio.h>#include <WinSock2.h>#pragma comment(lib, "WS2_32.lib")int main(int argc, char *argv[]){WSADATA wsaData;int resValue; //函数返回值， 用来查看各个函数的执行情况resValue = WSAStartup(MAKEWORD(2,2), &wsaData);if (resValue != NO_ERROR){printf("Error at WSAstartup\n");}SOCKET listenSocket; //创建用于监听的套接字listenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);if (listenSocket == INVALID_SOCKET){printf("Error at socket()\n");WSACleanup();return -1;}u_short Port = 27015;SOCKADDR_IN servAddr; //服务器地址servAddr.sin_family = AF_INET;servAddr.sin_port = htons(Port);hostent* thisHost;thisHost = gethostbyname("");//hostent{主机的规范名 主机的别名 主机的ip地址的类型 主机ip的地址长度 主机的ip地址（网络字节顺序）}char *ip = inet_ntoa(*(struct in_addr*)*thisHost->h_addr_list);servAddr.sin_addr.S_un.S_addr = inet_addr(ip);if (bind(listenSocket, (const SOCKADDR*)&servAddr, sizeof(servAddr)) == SOCKET_ERROR){printf("bind error\n");closesocket(listenSocket);WSACleanup();return -1;}int isockOption;int iOptlen = sizeof(int);if (getsockopt(listenSocket, SOL_SOCKET, SO_ACCEPTCONN, (char*)&isockOption, &iOptlen) != SOCKET_ERROR){printf("SO_ACCEPTCONN Value: %ld\n", isockOption);}if (listen(listenSocket, 100) == SOCKET_ERROR){printf("Listening failed...\n");}if (getsockopt(listenSocket, SOL_SOCKET, SO_ACCEPTCONN, (char*)&isockOption, &iOptlen) != SOCKET_ERROR){printf("SO_ACCEPTCONN Value: %ld\n", isockOption);}WSACleanup();system("pause");return 0;}

int setsockopt(SOCKET s, int level, int optname, const char *optval, int optlen);

#include "winsock2.h"#include <stdio.h>#pragma comment(lib, "WS2_32.lib")int main(int argc, char *argvp[]){WSADATA wsaData;int resValue;resValue = WSAStartup(MAKEWORD(2,2), &wsaData);if (resValue != NO_ERROR){printf("WSAstart failed\n");}SOCKET ListenSocket;ListenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);if (ListenSocket == INVALID_SOCKET){printf("socket() failed\n");WSACleanup();return -1;}SOCKADDR_IN servAddr;u_short Port = 27015;servAddr.sin_family = AF_INET;servAddr.sin_port = htons(Port);hostent* thisHost;thisHost = gethostbyname("");char *ip = inet_ntoa(*(struct in_addr*)*thisHost->h_addr_list);servAddr.sin_addr.S_un.S_addr = inet_addr(ip);if (bind(ListenSocket, (SOCKADDR*)&servAddr, sizeof(servAddr)) == SOCKET_ERROR){printf("bind failed\n");closesocket(ListenSocket);WSACleanup();return -1;}int isockOption = 0;int iOptlen = sizeof(int);if (getsockopt(ListenSocket, SOL_SOCKET, SO_KEEPALIVE, (char *)&isockOption, &iOptlen) != SOCKET_ERROR)printf("SO_KEEPALIVE VALUE: %ld\n", isockOption);BOOL bsockOption = TRUE;int bOptlen = sizeof(BOOL);if (setsockopt(ListenSocket, SOL_SOCKET, SO_KEEPALIVE, (char *)&bsockOption, bOptlen) != SOCKET_ERROR){printf("set SO_KEEPALIVE : ON\n");}if (getsockopt(ListenSocket, SOL_SOCKET, SO_KEEPALIVE, (char *)&isockOption, &iOptlen) != SOCKET_ERROR)printf("SO_KEEPALIVE VALUE: %ld\n", isockOption);WSACleanup();system("pause");return 0;}

0 0