tcp.h

来自「是TCPIP程序」· C头文件 代码 · 共 99 行

/*
 * tcp_write - 往连接中写入数据
 *           - 返回写入的字节数返回0表示俩见没有建立好
 */
void tcp_write( tcp_Socket xdata *s, uchar xdata *dp, int xdata len )
{
	int x;

	if ( s->state != tcp_StateESTAB )
		len = 0;
	if ( len > (x = tcp_MaxBufSize - s->datalen) )
		len = x;

	if ( len > 0 )
	{
		movmem( dp, s->data + s->datalen, len );
		s->datalen += len;
		s->unhappy = TRUE;
		s->timeout =  sock_data_timeout ;
              	tcp_send( s, __LINE__ );
        }
}


int _ip_delay1( sock_type *s, int timeoutseconds, sockfunct_t fn, int *statusptr)
{
	int status;
	ip_timer_init( s , timeoutseconds );

	sock_flush( s );

	do
	{
		if ( sock_dataready( s ))
		{
			status = 0;
			break;
		}
		kbhit();	/* permit ^c */

		if ( !tcp_tick( s ))
		{
			status = 1;
			break;
		}
		if ( ip_timer_expired( s ))
		{
			s->tcp.err_msg = "Connection timed out";
			sock_close( s );
			status = -1;
			break;
		}
		if (fn)
		{
			if ((status = fn(s)) != 0)
			break;
		}
	} while ( 1 );
	if (statusptr)
		*statusptr = status;
	return( status );
}

int _ip_delay2( sock_type *s, int timeoutseconds, sockfunct_t fn, int *statusptr)
{
	int status;
	ip_timer_init( s , timeoutseconds );

	do
	{
        /* 这时候用户不会读取得数据的，所以可以清空缓存 */
		s->tcp.rdatalen = 0;
		kbhit();	/* permit ^c */
		if ( !tcp_tick( s ))
		{
			status = 1;
			break;
		}
		if ( ip_timer_expired( s ))
		{
			s->tcp.err_msg = "Connection timed out";
			sock_abort( s );
			status = -1;
			break;
		}
		if (fn)
		{
			if ((status = fn(s)) != 0)
				break;
		}
    } while ( 1 );

	if (statusptr)
		*statusptr = status;
	return( status );
}