服务器端:
#include <stdio.h> #include <stdlib.h> #include <string.h> #include <error.h> #include <errno.h> #include <sys/socket.h> #include <netinet/in.h> #include <sys/types.h> #include <unistd.h> #define BACKLOG 10 int main(){ struct sockaddr_in server_sockaddr,client_sockaddr; int sockfd,clientfd; socklen_t clientsize; server_sockaddr.sin_family = AF_INET; server_sockaddr.sin_port = htons(9000); server_sockaddr.sin_addr.s_addr = htonl(INADDR_ANY); bzero(&(server_sockaddr.sin_zero),8); if((sockfd = socket(AF_INET,SOCK_STREAM,0)) == -1){ perror("socket() error"); exit(-1); } if(bind(sockfd,(struct sockaddr *)&server_sockaddr,sizeof(struct sockaddr)) == -1){ perror("bind() error"); exit(-1); } if(listen(sockfd,BACKLOG) == -1){ perror("listen() error"); exit(-1); } pid_t pid; ssize_t recvsize,sendsize; char buf[128]; while(1){ clientsize = sizeof(struct sockaddr); if((clientfd = accept(sockfd,(struct sockaddr*)&client_sockaddr,&clientsize)) == -1){ perror("accept() error"); exit(-1); } pid = fork(); if(pid == 0){ close(sockfd); while(1){ if((recvsize = recv(clientfd,buf,sizeof(buf),0)) == -1){ perror("recv() error"); exit(-1); } if(recvsize == 0 || strncmp(buf,"quit",4) == 0) exit(0);//child process exit printf("Received: %s",buf); bzero(buf,0); printf("Input message to send client: "); fgets(buf,128,stdin); if((sendsize = send(clientfd,buf,sizeof(buf),0)) == -1){ perror("send() error"); exit(-1); } } } } close(sockfd); return 0; }
#include <stdio.h> #include <stdlib.h> #include <string.h> #include <error.h> #include <errno.h> #include <sys/socket.h> #include <netinet/in.h> #include <sys/types.h> #include <unistd.h> #include <arpa/inet.h> int main(){ struct sockaddr_in server_addr; int sockfd; if((sockfd = socket(AF_INET,SOCK_STREAM,0)) == -1){ perror("socket() error"); exit(-1); } server_addr.sin_family = AF_INET; server_addr.sin_port = htons(9000); inet_pton(AF_INET,"127.0.0.1",&server_addr.sin_addr); bzero(&(server_addr.sin_zero),8); if(connect(sockfd,(struct sockaddr*)&server_addr,sizeof(struct sockaddr)) == -1){ perror("connect() error"); exit(-1); } ssize_t sendsize,recvsize; char buf[128]; while(1){ printf("Input message to send server: "); bzero(buf,0); fgets(buf,128,stdin); if((sendsize = send(sockfd,buf,sizeof(buf),0)) == -1){ perror("send() error"); exit(-1); } if(sendsize == 0 || strncmp(buf,"quit",4) == 0) break; bzero(buf,0); if((recvsize = recv(sockfd,buf,sizeof(buf),0)) == -1){ perror("recv() error"); exit(-1); } printf("Received: %s",buf); } close(sockfd); return 0; }