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From: "Graham Walsh" <graham_walsh50 AT hotmail DOT com>
To: cygwin AT cygwin DOT com
Subject: sys/types.h fails to compile under g++
Date: Sat, 31 Jan 2004 09:52:15 -0500
Mime-Version: 1.0
Content-Type: text/plain; format=flowed
Message-ID: <Law12-F1174RCIlWrdF00002ed5@hotmail.com>

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 ----> */

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