#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(xiàng)信息參數(shù)：socket: 文件描述符level: 對(duì)應(yīng)協(xié)議層SOL_SOCKET 應(yīng)用層IPPROTO_TCP TCP層IPPROTO_IP IP層option_name:選項(xiàng)的名稱(chēng)SO_BROADCAST 允許發(fā)送廣播 intSO_REUSEADDR 允許重復(fù)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(shè)置接收超時(shí)時(shí)間SO_SNDTIMEO 設(shè)置發(fā)送超時(shí)時(shí)間option_value:對(duì)應(yīng)選項(xiàng)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(shí)現(xiàn)的并發(fā)服務(wù)來(lái)做實(shí)驗(yàn)吧
運(yùn)行服務(wù)器、客戶端后，服務(wù)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(lái)自服務(wù)器");if(send(i, buf, N, 0) < 0){errmes("fail to send");}}}}}}close(sockfd);close(acceptfd);return 0; }

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