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POerror " undefined reference to " at compile time
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copied!<p>when I compile this file it keeps giving me </p> <pre><code>Undefined reference to size Undefined reference to file </code></pre> <p>I compiled it twice in the second time it give me both error, when the first time it give me only the second error.</p> <p>can I know exactly what is the problem and how I can solve it? </p> <p>ps: i use <code>gcc -o ser server.c</code> to compile </p> <p>Sorry I had problem with my Net</p> <pre class="lang-c prettyprint-override"><code> #include<stdio.h> #include<errno.h> #include<arpa/inet.h> #include<string.h> #include<netinet/in.h> #include<sys/types.h> #include<sys/socket.h> #include<stdlib.h> #include<fcntl.h> #define Max_len 1049 void error (char * str) { perror(str); exit(0); } </code></pre> <p>this the complete code</p> <pre><code>int main (int argc, char ** arg) { //------------------------- define data type int listenfd,connfd,clilen,portno,fil_fd; char buff[Max_len], *str,f_name[100],car=0xAA; struct sockaddr_in servaddr,cliaddr; FILE * file_ptr; //to store the pointer that point to the read file //------------------------- socket intinalizing if(argc != 2) //of user forget to insert the port number error("missing port number to complet establishment\n"); portno=atoi(arg[1]); //convert the port to int and check if it was within the rang if((portno<=22000) || (portno>=23000)) error("your port number not valid .... pleas insert one in reng (22000,22999)\n"); listenfd=socket(AF_INET,SOCK_STREAM,0); //creat the listing socket bzero((char *)&servaddr ,sizeof(servaddr)); servaddr.sin_family=AF_INET; //Ipv4 servaddr.sin_addr.s_addr=htonl(INADDR_ANY); servaddr.sin_port=htons(portno); bind(listenfd,(struct sockaddr *)&servaddr,sizeof(servaddr));//bind the liten socket to specific port listen(listenfd,5); //-------------------------- server start to wait to handle requests for(;;) { printf("server wait for connections\n"); bzero((char *)&cliaddr ,sizeof(cliaddr)); //clear the previus client information clilen=sizeof(cliaddr); //client informaton container connfd=accept(listenfd,(struct sockaddr *)&cliaddr,&clilen); if(connfd<0) error("error in accept this connection\n"); //--------------------------------------- //start the secret hand chacking snprintf(buff,/*sizeof(buff)*/1,"%c",0x55); write(connfd,buff,sizeof(buff)); //--------------------------------------- //read file name car=0xAA; read(connfd,buff,size(buff)); printf("client reply is %c",buff[0]); if(car==buff[0]) { printf("wait for file name \n"); // bzero(buff,sizeof(buff)); printf("1#%s\n",buff); read(connfd,buff,sizeof(buff)); printf("2#%s\n",buff); strncpy(f_name,buff,sizeof(buff)-1); printf("file return name is %s\n",buff); } else error("this is not secure client\n"); //-------------------------------------- if file found send 1 else 0 fil_fd=open(f_name,O_RDONLY); //file opent to be read only if(fil_fd < 0) { snprintf(buff, sizeof(buff),"%d",0); write(connfd,buff,1); file("file is not found\n"); //retminate connection only break; } else { snprintf(buff, sizeof(buff),"%d",1); write(connfd,buff,1); printf("file exists.Send 1 to client\nreading and send the deil\n"); //-----------------------------------reading and sending while(read(buff,1048,fil_fd)>0) { printf("%s \n\n",buff); write(connfd,buff,sizeof(buff)); //sending the file process }//end of uploading }//end of if_else //-------------------------------------------- close file resources " file" close(fil_fd); close(connfd); }//end of for() //--------------------------------------------prepair the server connection close(listenfd); exit(0); return 0; }//main() </code></pre>

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