嵌入式

linux下TCP连接的client和server

2019-07-13 08:35发布生成海报

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linux下TCP连接的client和server

http://blog.163.com/caipeipei_love@126/blog/static/2596603220101118433940/ 基于TCP连接的client和server简单通信我在看电子书，班主任来了说动手写个client和server的简单通信，只看是不行的，写好了给我看看，真的是一语点中了真理啊：只看不动手，什么时候都不会掌握的！下午自己就动手写了一个：主要是基于TCP的三次握手的，面向连接的client和server tcpserver.c

#include #include #include #include<string.h> #include #include #includein.h> #include #include #include #define portnumber 8080 int main(int argc ,char *argv[]) { int sockfd,new_fd; struct sockaddr_in server_addr; struct sockaddr_in client_addr; int sin_size,iDataNum; // const char hello[]="Hello cpp, you are success. "; char buffer[4096]; if(argc!=2) { fprintf(stderr,"Usage:%s portnumbera ",argv[0]); return 0; } // if((portnumber=atoi(argv[1]))<0) // { // fprintf(stderr,"Usage:%s portnumbera ",argv[0]); // return 0; // } if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1) { fprintf(stderr,"Socket error:%s a",strerror(errno)); return 0; } bzero(&server_addr,sizeof(struct sockaddr_in)); server_addr.sin_family=AF_INET; server_addr.sin_addr.s_addr=htonl(INADDR_ANY); server_addr.sin_port=htons(portnumber); if(bind(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1) { fprintf(stderr,"Bind error:%s a",strerror(errno)); return 0; } if(listen(sockfd,5)==-1) { fprintf(stderr,"Listen error:%s a",strerror(errno)); return 0; } while(1) { sin_size=sizeof(struct sockaddr_in); if((new_fd=accept(sockfd,(struct sockaddr *)(&client_addr),&sin_size))==-1) { fprintf(stderr,"Accept error:%s a",strerror(errno)); return 0; } fprintf(stdout,"Server get connection from %s ",inet_ntoa(client_addr.sin_addr)); iDataNum=recv(new_fd,buffer,4096,0); if(iDataNum<0) { perror("Recv "); exit(1); } printf("Recv data is %s ",buffer); send(new_fd,buffer,sizeof(buffer),0); // if(write(new_fd,hello,strlen(hello))==-1) // { // fprintf(stderr,"write error:%s ",strerror(errno)); // return 0; // } close(new_fd); } close(sockfd); // exit(0); return 0; }

client.c

#include #include #include<string.h> #include #include #includein.h> #include #include #include #include int main(int argc,char *argv[]) { int sockfd; char sendbuffer[200]; char recvbuffer[200]; // char buffer[1024]; struct sockaddr_in server_addr; struct hostent *host; int portnumber,nbytes; if(argc!=3) { fprintf(stderr,"Usage :%s hostname portnumbera ",argv[0]); exit(1); } if((host=gethostbyname(argv[1]))==NULL) { herror("Get host name error "); exit(1); } if((portnumber=atoi(argv[2]))<0) { fprintf(stderr,"Usage:%s hostname portnumbera ",argv[0]); exit(1); } if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1) { fprintf(stderr,"Socket Error:%sa ",strerror(errno)); exit(1); } bzero(&server_addr,sizeof(server_addr)); server_addr.sin_family=AF_INET; server_addr.sin_port=htons(portnumber); server_addr.sin_addr=*((struct in_addr *)host->h_addr); if(connect(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1) { fprintf(stderr,"Connect error:%s ",strerror(errno)); exit(1); } while(1) { printf("Please input your word: "); scanf("%s",sendbuffer); printf(" "); if(strcmp(sendbuffer,"quit")==0) break; send(sockfd,sendbuffer,sizeof(sendbuffer),0); recv(sockfd,recvbuffer,200,0); printf("recv data of my world is :%s ",recvbuffer); } // if((nbytes=read(sockfd,buffer,1024))==-1) //{ // fprintf(stderr,"read error:%s ",strerror(errno)); // exit(1); // } // buffer[nbytes]='