#include <sys/socket.h>int getsockopt(int socket, int level, int option_name,void *restrict option_value, socklen_t *restrict option_len);功能：獲取套接字相關(guān)的選項信息參數(shù)：socket: 文件描述符level: 對應協(xié)議層SOL_SOCKET 應用層IPPROTO_TCP TCP層IPPROTO_IP IP層option_name:選項的名稱SO_BROADCAST 允許發(fā)送廣播 intSO_REUSEADDR 允許重復使用地址 intSO_SNDBUF 獲取發(fā)送緩沖器大小SO_RCVBUF 獲取接收緩沖區(qū)大小SO_RCVTIMEO 設置接收超時時間SO_SNDTIMEO 設置發(fā)送超時時間option_value:對應選項的值option_len:大小返回值：成功：0失敗：-1碼片

讓我們用 select() 函數(shù)實現(xiàn)的并發(fā)服務來做實驗吧
運行服務器、客戶端后，服務器的現(xiàn)象是recv size = 85k， send size = 16k；

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <netinet/in.h> #include <sys/types.h> #include <sys/socket.h> #include <arpa/inet.h> #include <sys/select.h> #include <sys/time.h>#define errmes(mes) do{perror(mes);exit(1);}while(0) #define N 128int main(int argc, const char *argv[]) {int sockfd, acceptfd, maxfd;struct sockaddr_in serveraddr, clientaddr;char buf[N] = {};fd_set readfds, tempfds;socklen_t clientlen = sizeof(clientaddr);int i = 0;if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){errmes("fail to socket");}serveraddr.sin_family = AF_INET;serveraddr.sin_addr.s_addr = inet_addr(argv[1]);serveraddr.sin_port = htons(atoi(argv[2]));if(bind(sockfd, (struct sockaddr*)&serveraddr, sizeof(serveraddr)) < 0){errmes("fail to bind");}if(listen(sockfd, 10) < 0){errmes("fail to listen");}FD_ZERO(&readfds);FD_SET(sockfd, &readfds);maxfd = sockfd;while(1){tempfds = readfds;if(select(maxfd+1, &tempfds, NULL, NULL, NULL) < 0){errmes("fail to select");}for(i = 0; i < maxfd+1; i++){if(FD_ISSET(i, &tempfds) == 1){if(i == sockfd){if((acceptfd = accept(sockfd, (struct sockaddr*)&clientaddr, &clientlen)) < 0){errmes("fail to accept");}int bufsize;socklen_t size = sizeof(bufsize);if(getsockopt(acceptfd, SOL_SOCKET, SO_RCVBUF, &bufsize, &size) < 0){errmes("fail to getsockopt");}printf("recv size = %d\n",bufsize/1024);if(getsockopt(sockfd, SOL_SOCKET, SO_SNDBUF, &bufsize, &size) < 0){errmes("fail to getsockopt");}printf("send size =%d\n",bufsize/1024);FD_SET(acceptfd, &readfds);maxfd = maxfd > acceptfd ? maxfd : acceptfd ;printf("%s---->%d\n",inet_ntoa(clientaddr.sin_addr),ntohs(clientaddr.sin_port));}else{if(recv(i, buf, N, 0) < 0){errmes("fail to recv");}if(strncmp(buf, "quit", 4) == 0){printf("%s---quit\n",inet_ntoa(clientaddr.sin_addr));return 0;}else{printf("%s\n",buf);strcat(buf, "來自服務器");if(send(i, buf, N, 0) < 0){errmes("fail to send");}}}}}}close(sockfd);close(acceptfd);return 0; }

總結(jié)

以上是生活随笔為你收集整理的网络属性检查和设置-getsockopt（）的全部內(nèi)容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網(wǎng)站內(nèi)容還不錯，歡迎將生活随笔推薦給好友。