下面2個系統調用是專門用來讀取和設置socket文件描述符屬性的方法：

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這2個函數成功時返回0，失敗返回-1并設置errno。?

看個例子，server.c

#include<sys/socket.h> #include<netinet/in.h> #include<arpa/inet.h> #include<signal.h> #include<unistd.h> #include<stdlib.h> #include<assert.h> #include<stdio.h> #include<errno.h> #include<string.h> #include<stdbool.h> #include<libgen.h> const int BUFFER_SIZE=1024; int main(int argc,char* argv[]) {if(argc<=2){printf("usage: %s ip_address port_number recv_buffer_size\n",basename(argv[0]));return 1;}const char* ip=argv[1];int port=atoi(argv[2]);int sock=socket(PF_INET,SOCK_STREAM,0);assert(sock>=0);// 創建一個ipv4地址struct sockaddr_in address;bzero(&address,sizeof(address));address.sin_family=AF_INET;inet_pton(AF_INET,ip,&address.sin_addr);address.sin_port=htons(port);int recvbuf=atoi(argv[3]);int len=sizeof(recvbuf);// 先設置TCP接收緩沖區的大小，然后立即讀取setsockopt(sock,SOL_SOCKET,SO_RCVBUF,&recvbuf,sizeof(recvbuf));getsockopt(sock,SOL_SOCKET,SO_RCVBUF,&recvbuf,(socklen_t*)&len);printf("the tcp receive buffer size after setting is %d\n",recvbuf);int ret=bind(sock,(struct sockaddr*)&address,sizeof(address));assert(ret!=-1);ret=listen(sock,5);assert(ret!=-1);struct sockaddr_in client;socklen_t client_addrlength=sizeof(client);int connfd=accept(sock,(struct sockaddr*)&client,&client_addrlength);if(connfd<0){printf("errno is: %d\n",errno);}else{char buffer[BUFFER_SIZE];memset(buffer,'\0',BUFFER_SIZE);ret=recv(connfd,buffer,BUFFER_SIZE-1,0);{printf("got %d bytes of normal data %s\n",ret,buffer);}close(connfd);}close(sock);return 0; }

client.c

#include<sys/socket.h> #include<netinet/in.h> #include<arpa/inet.h> #include<signal.h> #include<unistd.h> #include<stdlib.h> #include<assert.h> #include<stdio.h> #include<errno.h> #include<string.h> #include<stdbool.h> #include<libgen.h> const int BUFFER_SIZE=512; int main(int argc,char* argv[]) {if(argc<=2){printf("usage: %s ip_address port_number send_buffer_size\n",basename(argv[0]));return 1;}const char* ip=argv[1];int port=atoi(argv[2]);int sockfd=socket(PF_INET,SOCK_STREAM,0);assert(sockfd>=0);// 創建一個ipv4地址struct sockaddr_in server_address;bzero(&server_address,sizeof(server_address));server_address.sin_family=AF_INET;inet_pton(AF_INET,ip,&server_address.sin_addr);server_address.sin_port=htons(port);int sendbuf=atoi(argv[3]);int len=sizeof(sendbuf);// 先設置TCP發送緩沖區的大小，然后立即讀取之setsockopt(sockfd,SOL_SOCKET,SO_SNDBUF,&sendbuf,sizeof(sendbuf));getsockopt(sockfd,SOL_SOCKET,SO_SNDBUF,&sendbuf,(socklen_t*)&len);printf("the tcp send buffer size after setting is %d\n",sendbuf);if(connect(sockfd,(struct sockaddr*)&server_address,sizeof(server_address))<0){printf("connection failed\n");}else{char buffer[BUFFER_SIZE];memset(buffer,'a',BUFFER_SIZE);send(sockfd,buffer,BUFFER_SIZE,0);}close(sockfd);return 0; }

服務端結果：

客戶端結果：

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總結

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