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POundefined reference to _red
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  1. POundefined reference to _red
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    copied!<p>I am writing a simple client program "socket programming" when compiling the code using cygwin I got this error "undefined reference to '_red' The code is below. I have been compiling with this statement gcc client.c I really do not understand why I am getting this error. I could really use some help. The code is below.</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;sys/types.h&gt; #include &lt;sys/socket.h&gt; #include &lt;netdb.h&gt; #include &lt;stdlib.h&gt; #include &lt;strings.h&gt; #include &lt;netinet/in.h&gt; #define SERVER_TCP_PORT 2000 #define BUFLEN 256 int main(int argc,char **argv) { int n,bytes_to_read; int sd,port; struct hostent *hp; struct sockaddr_in server; char *host,*bp,rbuf[BUFLEN],sbuf[BUFLEN]; switch(argc) { case 2: host = argv[1]; port = atoi(argv[2]); break; default: fprintf(stderr,"Usage: %s host[port] \n",argv[0]); exit(1); } /*Create a streamm socket*/ if ((sd=socket(AF_INET,SOCK_STREAM,0))==-1){ fprintf(stderr,"Can't create a socket\n"); exit(1); } bzero ((char *)&amp;server,sizeof(struct sockaddr_in)); server.sin_family = AF_INET; server.sin_port = htons(port); if((hp = gethostbyname(host))==NULL){ fprintf (stderr,"Can't get server's address\n"); exit(1); } //bcopy(hp-&gt;h_addr,(char *)&amp;server.sin_addr,hp-&gt;h_length); /*connecting to the server*/ if (connect (sd,(struct sockaddr *)&amp;server,sizeof(server))==-1){ fprintf(stderr,"Can't connect \n"); exit(1); } printf("Connected:server's address is %s\n",hp-&gt;h_name); printf("Transmit: \n"); gets(sbuf); /*get user's text*/ write (sd,sbuf,BUFLEN); /*send it out*/ printf("Receive: \n"); bp = rbuf; bytes_to_read = BUFLEN; while ((n=red(sd,bp,bytes_to_read))&gt;0){ bp+=n; bytes_to_read -=n; } printf("%s\n",rbuf); close(sd); return(0); } </code></pre>
 

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