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Message-Id: <6.0.1.1.0.20040131132235.038a27e8@127.0.0.1>
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Date: Sat, 31 Jan 2004 13:24:53 -0500
To: "Graham Walsh" <graham_walsh50 AT hotmail DOT com>, cygwin AT cygwin DOT com
From: Larry Hall <cygwin-lh AT cygwin DOT com>
Subject: Re: sys/types.h fails to compile under g++
In-Reply-To: <Law12-F1174RCIlWrdF00002ed5@hotmail.com>
References: <Law12-F1174RCIlWrdF00002ed5 AT hotmail DOT com>
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WFM with 'g++ -o sock sock.cpp'.  

Your gcc/g++ is out of date, though I doubt that's the main problem.  See 
<http://cygwin.com/problems.html> if you need to post again for help on
this issue.

Thanks,

Larry


At 09:52 AM 1/31/2004, Graham Walsh you wrote:
>Hiya, first time using cygwin.... I have a linker error when compiling a stock socket app.  All I use is standard calls to socket, bind etc. etc.
>
>All the symbols usually located in libsocket.so on unix are missing, i.e. bind, socket, etc. etc. I am at a loss as to what to link against. If anybody knows the compilation and link options I need it would help me out completely. I am assuming that the standard cygwin release provides all the libs I need to do this type of unix coding on my humble XP box. If I've missed anything, please let me know. I am using GCC v3.2 on an XP machine with the latest cygwin installation.
>
>
>my goal here is simply to write unix style code with gcc on my xp box.
>
>
>Cheers,
>
>
>GrahamO
>
>
>#include <stdio.h>
>#include <sys/types.h>
>#include <sys/socket.h>
>#include <netinet/in.h>
>#include <netdb.h>
>#include <unistd.h>
>#include <string.h>
>#include <arpa/inet.h>
>#include <stdlib.h>
>#define PORT 3550   /* Port that will be opened */
>#define BACKLOG 2   /* Number of allowed connections */
>extern "C" int close(int);
>extern "C" void bzero(void *, size_t);
>using namespace std;
>main()
>{
> int fd, fd2; /* file descriptors */
> struct sockaddr_in server; /* server's address information */
> struct sockaddr_in client; /* client's address information */
> int sin_size;
> if ((fd=socket(AF_INET, SOCK_STREAM, 0)) == -1 )
> {  /* calls socket() */
>   printf("socket() error\n");
>   exit(-1);
> }
> server.sin_family = AF_INET;
> server.sin_port = htons(PORT);   /* Remember htons() from "Conversions" section? =) */
> server.sin_addr.s_addr = INADDR_ANY;  /* INADDR_ANY puts your IP address automatically */
>//   bzero(&(server.sin_zero),8); /* zero the rest of the structure */
>//  void *memset (void *ptr, int val, size_t len);
> memset(&(server.sin_zero), 0, 8);
>
> if(bind(fd,(struct sockaddr*)&server,sizeof(struct sockaddr))==-1){ /* calls bind() */
>     printf("bind() error\n");
>     exit(-1);
>
> }
> if(listen(fd,BACKLOG) == -1){  /* calls listen() */
>     printf("listen() error\n");
>     exit(-1);
> }
>while(1){
> sin_size=sizeof(struct sockaddr_in);
> if ((fd2 = accept(fd,(struct sockaddr *)&client,&sin_size))==-1){ /* calls accept() */
>   printf("accept() error\n");
>   exit(-1);
> }
>
> printf("You got a connection from %s\n",inet_ntoa(client.sin_addr) ); /* prints client's IP */
>
> send(fd2,"Welcome to my server.\n",22,0); /* send to the client welcome message */
>
> close(fd2); /*  close fd2 */
>}
>}
>/* <---- SOURCE CODE ENDS HERE ----> */
>
>_________________________________________________________________
>Scope out the new MSN Plus Internet Software — optimizes dial-up to the max!   http://join.msn.com/?pgmarket=en-us&page=byoa/plus&ST=1
>
>
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--
Larry Hall                              http://www.rfk.com
RFK Partners, Inc.                      (508) 893-9779 - RFK Office
838 Washington Street                   (508) 893-9889 - FAX
Holliston, MA 01746                     


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