void recvMsg(){

int sockfd,new_fd,serverip;/**/

struct sockaddr_in server;/*server's address information*/

struct sockaddr_in client;/*client's address information*/

socklen_t sin_size;

int num;/*the binary count of recieved message*/

char recvmsg[MAXDATASIZE];/*buffer for recieve message*/

char sendmsg[MAXDATASIZE];/*buffer for send message*/

/*create a unbind socket*/

if((sockfd = socket(AF_INET,SOCK_STREAM,0))==-1){

perror("Creating socket failed");

exit(1);

}

bzero(&server,sizeof(server));/*set the server 0000*/

/**

*服务器端的信息

*/

server.sin_family = AF_INET;

server.sin_port = htons(atoi(port));

if(strlen(ip)>0){

inet_pton(AF_INET,ip,(void*)&serverip);

server.sin_addr.s_addr = serverip;

}

else

server.sin_addr.s_addr = htonl(INADDR_ANY);

/*将socket绑定到本机*/

if(bind(sockfd,(struct sockaddr *)&server,sizeof(struct sockaddr))==-1){

perror("Bind failed");

exit(1);

}

if(listen(sockfd,10)==-1){

perror("listen failed");

}

sin_size = sizeof(struct sockaddr_in);

while(1){

if((new_fd = accept(sockfd,(struct sockaddr*)&client,&sin_size))==-1){

perror("accept failed");

}

if(!fork()){

bzero(&recvmsg,sizeof(recvmsg));

if((num = recv(new_fd,recvmsg,sizeof(recvmsg),0))==-1){

perror("recv failed");

}

recvmsg[num] = '\0';

char **temp,*msg,*flag;

temp = split(recvmsg,"-");

flag = temp[0];

msg = temp[1];

/*对客户端过来的各种指令进行处理*/

if(strcmp(flag,"login")==0){

sprintf(sendmsg,"%d",checkLogin(msg));

}

if(strcmp(flag,"lmkdir")==0){

sprintf(sendmsg,"%d",mkdr(msg));

}

if(strcmp(flag,"lrmdir")==0){

sprintf(sendmsg,"%d",rmdr(msg));

}

if(strcmp(flag,"lpwd")==0){

curdr(sendmsg);

}

if(strcmp(flag,"lcd")==0){

chdr(msg,sendmsg);

}

if(strcmp(flag,"dir")==0){

lsdr(sendmsg);

}

if(strcmp(flag,"put")==0){

//get(new_fd,msg);

puts("zxzx");

char buffer[MAXDATASIZE];

FILE *fp = fopen("/home/chichao/ftp/txt.txt","w+");

if(NULL == fp ){

    perror("can not write");

}

else{

    bzero(buffer, MAXDATASIZE);

    int file_block_length = 0;

    while((file_block_length = recv(new_fd,buffer,sizeof(buffer),0))>0){

   int write_length = fwrite(buffer,sizeof(char),file_block_length,fp);

bzero(buffer, MAXDATASIZE);

   }

   puts("endend");

   if(file_block_length<0){

perror("recv data failed");

   }  

fclose(fp);

     }

}

sendmsg[strlen(sendmsg)] = '\0';

if(send(new_fd,sendmsg,strlen(sendmsg),0)==-1){

perror("send");

}

close(new_fd);

}//



}

close(sockfd);/**/

}
客户端:
/*上传单个文件*/

void putf(){

char filename[FILE_NAME_MAX_SIZE];

char buffer[MAXDATASIZE];

int serverip;

int sockfd;/*socket*/

struct sockaddr_in server;/*server's address information*/

int num;/*the binary count of recieved message*/

/*create a unbind socket*/

if((sockfd = socket(AF_INET,SOCK_STREAM,0))==-1){

perror("Creating socket failed");

exit(1);

}

/**

*服务器端的信息

*/

server.sin_family = AF_INET;

server.sin_port = htons(atoi(port));

inet_pton(AF_INET,ip,(void*)&serverip);   

server.sin_addr.s_addr = serverip;

         bzero(buffer, MAXDATASIZE);

         // 新建文件

printf("please input filename>");

gets(filename);

         FILE *fp = fopen(filename, "r");

         if (NULL == fp)

         {

             perror("can not read");

         }

if(connect(sockfd,(struct sockaddr*)&server,sizeof(struct sockaddr))==-1){

perror("connect failed");

}

//发送文件名和标志位

sprintf(buffer,"%s-%s","put",filename);

if((num=send(sockfd,buffer,strlen(buffer),0))==-1){

perror("send flag failed");

exit(1);

}

bzero(buffer, MAXDATASIZE);

int file_block_length = 0;

while((file_block_length = fread(buffer, sizeof(char), MAXDATASIZE, fp)) > 0){

if((num = send(sockfd,buffer,MAXDATASIZE,0))>0){

perror("send message failed");

}

printf("%d",num);

buffer[num] = '\0';

printf("%s",buffer);

}

printf("file: %s upload finished", filename);

printf("\nmyftp>");

     fclose(fp);

recv(sockfd,buffer,sizeof(buffer),0);

printf("%s",buffer);

close(sockfd);/**/

}