test_tcp.c

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#ifdef WIN32
#define ioctl ioctlsocket

#define closesock myclosesocket
#define readsock recv
#define writesock send

#define EINTR WSAEINTR
#define EADDRNOTAVAIL WSAEADDRNOTAVAIL
#define EWOULDBLOCK WSAEWOULDBLOCK
#define ECONNREFUSED WSAECONNREFUSED
#define HOST_NOT_FOUND  WSAHOST_NOT_FOUND
#define NO_DATA WSANO_DATA

#include <windows.h>
#include <process.h>
#include <io.h>
#include <fcntl.h>
#include <Winsock.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#else
#define closesock close
#define readsock(a,b,c,d) read(a,b,c)

#if defined(__linux__) && !defined (darwin)
#define writesock(a,b,c,d) send(a,b,c,MSG_NOSIGNAL)
#else
#define writesock(a,b,c,d) write(a,b,c)
#endif
#include <ctype.h>
#include <sys/socket.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <netdb.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#endif

#define ushort unsigned short
#define TCP_RCV_BUF_SIZE        16384/*32768*//*65536*/
#define TCP_SND_BUF_SIZE        16384/*32768*//*65536*/


#ifdef WIN32
int init_sock()
{
        WORD wVersionRequested;
        WSADATA wsaData;
        int err;
        static int sock_init_done = 0;

        if(sock_init_done) return(1);
        wVersionRequested = MAKEWORD( 2, 0 );
        err = WSAStartup( wVersionRequested, &wsaData );

        if ( err != 0 ) 
        {
        return(0);
        }

        /* Confirm that the WinSock DLL supports 2.0.*/
        /* Note that if the DLL supports versions greater    */
        /* than 2.0 in addition to 2.0, it will still return */
        /* 2.0 in wVersion since that is the version we      */
        /* requested.                                        */

        if ( LOBYTE( wsaData.wVersion ) != 2 ||
        HIBYTE( wsaData.wVersion ) != 0 ) 
        {
            WSACleanup( );
        return(0); 
        }
        sock_init_done = 1;
        return(1);
}

int myclosesocket(int path)
{
        int code, ret;
        code = WSAGetLastError();
        ret = closesocket(path);
        WSASetLastError(code);
        return ret;
}
#endif

int tcp_open_client( char *node, int port )
{
        /* Create connection: create and initialize socket stuff. Try
         * and make a connection with the server.
         */
        struct sockaddr_in sockname;
        struct hostent *host;
        int path, val, ret_code, ret;

#ifdef WIN32
        init_sock();
#endif
        if( (host = gethostbyname(node)) == (struct hostent *)0 ) 
        {
                return(0);
        }

        if( (path = socket(AF_INET, SOCK_STREAM, 0)) == -1 ) 
        {
                perror("socket");
                return(0);
        }

        val = 1;
      
        if ((ret_code = setsockopt(path, IPPROTO_TCP, TCP_NODELAY, 
                        (char*)&val, sizeof(val))) == -1 ) 
        {
#ifdef DEBUG
                printf("Couln't set TCP_NODELAY\n");
#endif
                closesock(path); 
                return(0);
        }

        val = TCP_SND_BUF_SIZE;      
        if ((ret_code = setsockopt(path, SOL_SOCKET, SO_SNDBUF, 
                        (char*)&val, sizeof(val))) == -1 ) 
        {
#ifdef DEBUG
                printf("Couln't set SO_SNDBUF\n");
#endif
                closesock(path); 
                return(0);
        }

        val = TCP_RCV_BUF_SIZE;
        if ((ret_code = setsockopt(path, SOL_SOCKET, SO_RCVBUF, 
                        (char*)&val, sizeof(val))) == -1 ) 
        {
#ifdef DEBUG
                printf("Couln't set SO_RCVBUF\n");
#endif
                closesock(path); 
                return(0);
        }

#if defined(__linux__) && !defined (darwin)
        val = 2;
        if ((ret_code = setsockopt(path, IPPROTO_TCP, TCP_SYNCNT, 
                        (char*)&val, sizeof(val))) == -1 ) 
        {
#ifdef DEBUG
                printf("Couln't set TCP_SYNCNT\n");
#endif
        }
#endif

        sockname.sin_family = PF_INET;
        sockname.sin_addr = *((struct in_addr *) host->h_addr);
        sockname.sin_port = htons((ushort) port); /* port number to send to */
        while((ret = connect(path, (struct sockaddr*)&sockname, sizeof(sockname))) == -1 )
        {
                if(errno != EINTR)
                {
                        closesock(path);
                        return(0);
                }
        }
        return(path);
}

int tcp_write( int path, char *buffer, int size )
{
        /* Do a (synchronous) write to conn_id.
         */
        int     wrote;

        wrote = writesock( path, buffer, size, 0 );
        if( wrote == -1 ) {
                return(0);
        }
        return(wrote);
}