## socket.h [c++]
// a tcp socket class
#ifndef SOCKET_H
#define SOCKET_H

#include <cstring>
#include <iostream>
#include <cstdio>
#include <unistd.h>

#ifdef __CYGWIN32__
#include <winsock.h>
{
    WSADATA ws;
    if (WSAStartup(MAKEWORD(1,1), &ws) != 0)
		{perror("WSAStartup failed.\n");exit(1);}
}

void close(int sock){ closesocket(sock);}
#endif

#ifdef __unix__
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#endif


class socket
{
public:
socket(const char*, const char*);
void listen();
void connect();
void send(const void *msg);
void recv(void* dest, int maxsize);
~socket();
private:
struct addrinfo filled,*output,*real;
struct sockaddr_storage incoming;
int errchk,sock,list_sock,len;
socklen_t size_storage;
};

socket::socket(const char *host,const char *port)
{
	memset(&filled,0,sizeof filled);
	filled.ai_flags=AI_PASSIVE;
	filled.ai_family=AF_UNSPEC;
	filled.ai_socktype=SOCK_STREAM;
	if(errchk=getaddrinfo(host,port,&filled,&output) != 0)
		{perror("getaddrinfo failed"); exit(-1);}
	for(real=output;real != NULL;real=real->ai_next)
	{
		if(sock=socket(real->ai_family,real->ai_socktype,real->ai_protocol) == -1)
			{perror("linked list entry fail\n"); exit(-1); continue;}
		break;
	}
}

void socket::listen()
{
	int y=1;
	if (setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,&y,sizeof(int)) == -1)
		{perror("setsockopt failed to clearn port--BADD\n");exit(1);}
	if (bind(sock,real->ai_addr,real->ai_addrlen) == -1)
		{
		close(sock);
		perror("bind failed"); exit(1);
		}
	if(errchk=listen(sock,10) == -1)
		{perror("listening on port failed"); exit(1);}
	size_storage=sizeof incoming
	if(list_sock=accept(sock,(struct sockaddr *)&incoming,&size_storage) == -1)
		{perror("accepting connection failed"); exit(1);}
		sock=list_sock;
		close(list_sock);
}


void socket::connect()
{
	if(errchk=connect(sock,real->ai_addr,real->ai_addrlen) == -1)
		{perror("connection to host failed\n");exit(1);}
}

void socket::send(const void *msg)
{
	len=strlen(msg);
	if(errchk=send(sock,msg,len,0) == -1)
		perror("failed to send buffer at all\n");
	if(errchk != len)
		std::cout<<"failed to send all of the buffer, loop plz\n";
}

void socket::recv(void* dest, int maxsize)
{
	if(errchk=recv(sock,dest,maxsize,0) == -1)
		perror("failed to receive data at all\n");
	if(errchk==0)
		std::cout<<"none of the data was received, 0 bytes\n":
}

socket::~socket()
{
close(sock);
}
#endif SOCKET_H



## sockettest.cpp [c++]
//testing socket class

#include "socket.h"
#include <iostream>

int main(void)
{
socket newconn("google.com","80");
newconn.connect();
char* buf=new char[512];
char* msg="GET /index.html HTTP/1.1\0x0D\0x0A";
newconn.send(msg); newconn.recv(buf,512);
std::cout<<buf<<"\n";
}

## error messages from compiling [plain_text]

In file included from socket.h:11,
                 from socktest.cc:3:
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:82:2: #warning "fd_set and associated macros have been defined in sys/types.      This can cause runtime problems with W32 soc
In file included from socket.h:11,
                 from socktest.cc:3:
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:480: error: declaration of C function `int gethostname(char*, int)' conflicts with
/usr/include/sys/unistd.h:206: error: previous declaration `int gethostname(char*, size_t)' here
In file included from socktest.cc:3:
socket.h:12: error: expected unqualified-id before '{' token
socket.h:12: error: expected `,' or `;' before '{' token
socket.h: In function `void close(int)':
socket.h:18: error: new declaration `void close(int)'
/usr/include/sys/unistd.h:29: error: ambiguates old declaration `int close(int)'
In file included from /usr/include/sys/socket.h:15,
                 from socket.h:23,
                 from socktest.cc:3:
/usr/include/cygwin/socket.h: At global scope:
/usr/include/cygwin/socket.h:29: error: redefinition of `struct sockaddr'
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:318: error: previous definition of `struct sockaddr'
In file included from /usr/include/sys/socket.h:15,
                 from socket.h:23,
                 from socktest.cc:3:
/usr/include/cygwin/socket.h:59: error: redefinition of `struct linger'
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:108: error: previous definition of `struct linger'
In file included from socket.h:23,
                 from socktest.cc:3:
/usr/include/sys/socket.h:29: error: declaration of C function `int accept(int, sockaddr*, socklen_t*)' conflicts with
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:434: error: previous declaration `SOCKET accept(SOCKET, sockaddr*, int*)' here
/usr/include/sys/socket.h:30: error: declaration of C function `int bind(int, const sockaddr*, socklen_t)' conflicts with
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:435: error: previous declaration `int bind(SOCKET, const sockaddr*, int)' here
/usr/include/sys/socket.h:31: error: declaration of C function `int connect(int, const sockaddr*, socklen_t)' conflicts with
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:437: error: previous declaration `int connect(SOCKET, const sockaddr*, int)' here
/usr/include/sys/socket.h:32: error: declaration of C function `int getpeername(int, sockaddr*, socklen_t*)' conflicts with
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:439: error: previous declaration `int getpeername(SOCKET, sockaddr*, int*)' here
/usr/include/sys/socket.h:33: error: declaration of C function `int getsockname(int, sockaddr*, socklen_t*)' conflicts with
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:440: error: previous declaration `int getsockname(SOCKET, sockaddr*, int*)' here
/usr/include/sys/socket.h:34: error: declaration of C function `int listen(int, int)' conflicts with
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:444: error: previous declaration `int listen(SOCKET, int)' here
/usr/include/sys/socket.h:35: error: declaration of C function `int recv(int, void*, size_t, int)' conflicts with
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:445: error: previous declaration `int recv(SOCKET, char*, int, int)' here
/usr/include/sys/socket.h:37: error: declaration of C function `int recvfrom(int, void*, size_t, int, sockaddr*, socklen_t*)' conflicts with
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:446: error: previous declaration `int recvfrom(SOCKET, char*, int, int, sockaddr*, int*)' here
/usr/include/sys/socket.h:39: error: declaration of C function `int send(int, const void*, size_t, int)' conflicts with
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:447: error: previous declaration `int send(SOCKET, const char*, int, int)' here
/usr/include/sys/socket.h:42: error: declaration of C function `int sendto(int, const void*, size_t, int, const sockaddr*, socklen_t)' conflicts with
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:448: error: previous declaration `int sendto(SOCKET, const char*, int, int, const sockaddr*, int)' here
/usr/include/sys/socket.h:44: error: declaration of C function `int setsockopt(int, int, int, const void*, socklen_t)' conflicts with
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:449: error: previous declaration `int setsockopt(SOCKET, int, int, const char*, int)' here
/usr/include/sys/socket.h:46: error: declaration of C function `int getsockopt(int, int, int, void*, socklen_t*)' conflicts with
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:441: error: previous declaration `int getsockopt(SOCKET, int, int, char*, int*)' here
/usr/include/sys/socket.h:47: error: declaration of C function `int shutdown(int, int)' conflicts with
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:450: error: previous declaration `int shutdown(SOCKET, int)' here
/usr/include/sys/socket.h:48: error: declaration of C function `int socket(int, int, int)' conflicts with
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:451: error: previous declaration `SOCKET socket(int, int, int)' here
In file included from socket.h:24,
                 from socktest.cc:3:
/usr/include/netdb.h:73: error: redefinition of `struct hostent'
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:100: error: previous definition of `struct hostent'
/usr/include/netdb.h:87: error: redefinition of `struct netent'
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:135: error: previous definition of `struct netent'
/usr/include/netdb.h:94: error: redefinition of `struct servent'
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:141: error: previous definition of `struct servent'
/usr/include/netdb.h:102: error: redefinition of `struct protoent'
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api/winsock.h:147: error: previous definition of `struct protoent'
In file included from socktest.cc:3:
socket.h:38: error: field `filled' has incomplete type
socket.h: In constructor `socket::socket(const char*, const char*)':
socket.h:46: error: `filled' undeclared (first use this function)
socket.h:46: error: (Each undeclared identifier is reported only once for each function it appears in.)
socket.h:47: error: `AI_PASSIVE' undeclared (first use this function)
socket.h:50: error: `getaddrinfo' undeclared (first use this function)
socket.h:52: error: invalid use of undefined type `struct addrinfo'
socket.h:38: error: forward declaration of `struct addrinfo'
socket.h:54: error: invalid use of undefined type `struct addrinfo'
socket.h:38: error: forward declaration of `struct addrinfo'
socket.h:54: error: invalid use of undefined type `struct addrinfo'
socket.h:38: error: forward declaration of `struct addrinfo'
socket.h:54: error: invalid use of undefined type `struct addrinfo'
socket.h:38: error: forward declaration of `struct addrinfo'
socket.h: In member function `void socket::listen()':
socket.h:65: error: invalid use of undefined type `struct addrinfo'
socket.h:38: error: forward declaration of `struct addrinfo'
socket.h:65: error: invalid use of undefined type `struct addrinfo'
socket.h:38: error: forward declaration of `struct addrinfo'
socket.h:70: error: no matching function for call to `socket::listen(int&, int)'
socket.h:61: note: candidates are: void socket::listen()
socket.h:73: error: expected `;' before "if"
socket.h: In member function `void socket::connect()':
socket.h:82: error: invalid use of undefined type `struct addrinfo'
socket.h:38: error: forward declaration of `struct addrinfo'
socket.h:82: error: invalid use of undefined type `struct addrinfo'
socket.h:38: error: forward declaration of `struct addrinfo'
socket.h: In member function `void socket::send(const void*)':
socket.h:88: error: invalid conversion from `const void*' to `const char*'
socket.h:89: error: no matching function for call to `socket::send(int&, const void*&, int&, int)'
socket.h:87: note: candidates are: void socket::send(const void*)
socket.h: In member function `void socket::recv(void*, int)':
socket.h:97: error: no matching function for call to `socket::recv(int&, void*&, int&, int)'
socket.h:96: note: candidates are: void socket::recv(void*, int)
socket.h:100: error: expected `;' before ':' token
In file included from socktest.cc:3:
socket.h:107:8: extra tokens at end of #endif directive
socktest.cc: In function `int main()':
socktest.cc:8: error: expected `;' before "newconn"
socktest.cc:8: warning: statement is a reference, not call, to function `socket'
socktest.cc:8: warning: statement has no effect
socktest.cc:9: error: `newconn' undeclared (first use this function)