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Hi,
Below is the code that i hv taken from some site(never done socket programming in C so having a taste of it) n trying to run it.
But i got the errors which i m not able to resolve.
Source code
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
int main(int argc, char *argv[])
{
struct hostent *h;
if(argc != 2)
{
fprintf(stderr, "usage: getip address\n");
exit(1);
}
if( (h = gethostbyname(argv[1]))== NULL)
{
herror("gethostbyname");
exit(1);
}
compile
apollo 155: cc GETIP.c
Error
Undefined first referenced
symbol in file
gethostbyname GETIP.o
inet_ntoa GETIP.o
herror GETIP.o
ld: fatal: Symbol referencing errors. No output written to a.out
Please throw some light to resolve this error.
My guess are
1) Is any library file missing as it is giving error like this.
2) If yes, from where i will get the library files.
3) Do i have to keep these library files (in case if i get it from somewhere ) in the current directory. Because i m running this program on one server which is at remote location. I am having my user id there and trying to run this program.
PLEASE SUGGEST SOMETHING.
I HOPE I WILL GET THE ANSWER TO MY QUERY.
Regards
Dipesh
Offline
It sounds like you're on one of those wacky systems which keep their
socket functions in a separate library... I hate those systems... ;-)
Try adding "-lsocket" and/or "-lnsl" to the link command line...
Offline
Thanx for answering my query !!
When i used "-lnsl" to the link command line... it worked...my code got compiled properly and i go the output.
As shown in my code in my previous mail where i hv used "herror" function ...so i was getting error during compilation. After commenting that line my program ran properly. Is that function defined in some other library file ?. For running every program do i hv to give "lnsl" option ?
When i used "-lsocket"I still got the errors like......
Undefined first referenced
symbol in file
gethostbyname GETIP.o (symbol belongs to implicit dependency /usr/lib/libnsl.so.1)
inet_ntoa GETIP.o (symbol belongs to implicit dependency /usr/lib/libnsl.so.1)
ld: fatal: Symbol referencing errors. No output written to a.out
Thanx for solving my problem.
Regards !!
Dipesh
Offline
It sounds like you're on one of those wacky systems which keep their
socket functions in a separate library... I hate those systems... ;-)Try adding "-lsocket" and/or "-lnsl" to the link command line...
Thanks a lot. Though it was an old post, it helped to fix my problem in one of the wacky system.
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