Re: socket: Undefined

["Peter A. Friend" <octavian@corp.earthlink.net>]

You need to look at the man pages for those functions, where you'll see
stuff like this:

     cc [ flag ... ] file ...  -lsocket -lnsl [ library ... ]
 
     #include <sys/types.h>
     #include <sys/socket.h>
 
On Solaris, you need to include -lsocket and -lnsl for anything that
uses sockets. To make this work, use something like:

gcc *.c -lsocket -lnsl

HTH,

Peter

---
Software Engineer
EarthLink Network

On Mon, 20 Sep 1999, Shicheng wrote:

> I work on SunOS 5.6 platform from a networked NT machine via telnet; and
> I would like to obtain some advice on using the gcc compiler. Under my
> working dir, there are five files: connectsock.c,
> connecttcp.c, connectudp.c, errexit.c and tcpdaytime.c; after issuing
> the commend:
> 
> gcc *.c
> 
> however, I got the following errors:
> 
> "[60]% gcc *.c
> Undefined                      first referenced
> symbol                            in file
> socket                              /var/tmp/cc0heQO31.o
> getprotobyname                      /var/tmp/cc0heQO31.o
> gethostbyname                      /var/tmp/cc0heQO31.o
> getservbyname                      /var/tmp/cc0heQO31.o
> inet_addr                          /var/tmp/cc0heQO31.o
> connect                            /var/tmp/cc0heQO31.o
> ld: fatal: Symbol referencing errors. No output written to a.out"
> 
> In the file connectsock.c, I do include the follwing paths:
> 
> #include "/usr/include/sys/types.h"
> #include "/usr/include/sys/socket.h"
> 
> #include "/usr/include/netinet/in.h"
> #include "/usr/include/netdb.h"
> 
> I even checked all the required files are there under the include dir! I
> had the same errors when using "cc" as well!
> 
> BTW, when trying another simple program which just makes use
> of the #include <stdio.h>, there is no problem/errors at all!
> 
> Thanks for sending me some advice on how to solve this problem.
> 
> Shicheng
> 
> 
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