开发板（ubuntu系统）通过串口接收数据，并将数据通过网口转发出去

测试软件windows下串口助手和cmd下的telnet，ubuntu下的minicom.(设置好相应的串口号和端口号)此程序可以正常接收数据。

#include<termios.h>
#include<unistd.h>
#include<stdlib.h>
#include<fcntl.h>
#include<linux/kernel.h>
#include<stdio.h>
#include<pthread.h>
#include<string.h>
#include<sys/select.h>
#include<sys/time.h>
#include<sys/socket.h>
#include<sys/types.h>
#include<netinet/in.h>
#include<errno.h>

#define PORT  6666
#define DeviceName "/dev/ttySAC2"
#define DeviceSpeedDef  B115200
#define ParityBitDef  
#define DataBitDef           8
#define StopBitDef           1

char buf[256];
int ComFd;
void SetCom(int fd,int BaudRate,int DateBit,int StopBit)
{
	struct  termios    CmdCfg1,Cmdfg2;
	tcgetattr(fd,&Cmdfg2);
	CmdCfg1=Cmdfg2;
	cfmakeraw(&CmdCfg1);
	CmdCfg1.c_cflag&=~CSIZE;
	cfsetispeed(&CmdCfg1,BaudRate);
	cfsetospeed(&CmdCfg1,BaudRate); //
	CmdCfg1.c_cflag&=~CSIZE;
	CmdCfg1.c_cflag|=CS8;
	CmdCfg1.c_cflag&=~PARENB;          
	CmdCfg1.c_iflag&=~INPCK;

	CmdCfg1.c_cflag&=~CSTOPB;
	CmdCfg1.c_cc[VTIME] = 1;
	CmdCfg1.c_cc[VMIN] = 1;
	tcflush(fd,TCIFLUSH);
	tcsetattr(fd,TCSANOW,&CmdCfg1);
}

int ComRecv(int fd,char *buf,int datelen)
{
			int len,fs_sel;
			fd_set  fs_read;
			struct timeval time;
			FD_ZERO(&fs_read);
            FD_SET(fd,&fs_read);
			time.tv_sec=5;
			time.tv_usec=0;

			fs_sel =select(fd+1,&fs_read,NULL,NULL,&time);
			if(fs_sel)
			{
				len=read(fd,buf,datelen);
				printf("len =%d,fs_sel=%d\n",len,fs_sel);
				return len;
			}
			else 
				return 0;
}

int main(int argc,char *argv[])
{
        int ser_sockfd,cli_sockfd,err,n,addlen;
        struct sockaddr_in ser_addr;
        struct sockaddr_in cli_addr;
	char recvline[200],sendline[200];
	ser_sockfd=socket(AF_INET,SOCK_STREAM,0);
	if(ser_sockfd==-1)
        {
		printf("sockfd error:%s\n",strerror(errno));
      		return -1; 
       }
	bzero(&ser_addr,sizeof(ser_addr));
	ser_addr.sin_family=AF_INET;
	ser_addr.sin_addr.s_addr=htonl(INADDR_ANY);
        ser_addr.sin_port=htons(PORT);
        err=bind(ser_sockfd,(struct sockaddr*)&ser_addr,sizeof(ser_addr));
       if(err == -1)
  	{
		printf("bind error:%s\n",strerror(errno));
                return -1;
        }
	err=listen(ser_sockfd,5);
	if(err==-1)
	{
          printf("listen error \n");
	  return -1;
	}	
	printf("listen the port\n");
	pthread_t IDComRecv;
	int ret1;
	int r_count;
	 ComFd = open(DeviceName,O_RDWR|O_NOCTTY);
	 if(ComFd ==-1)
	 {
	    printf("Open Com failed");
	    return 1;
	 }

	 SetCom(ComFd,DeviceSpeedDef,DataBitDef,StopBitDef);
	while(1)
       {      addlen = sizeof(struct sockaddr);
                cli_sockfd=accept(ser_sockfd,(struct sockaddr*)&cli_addr,&addlen);
		if(cli_sockfd==-1)
                {
			printf("accept error\n");
                }
	while(1)
	{      
		r_count = ComRecv(ComFd, buf, sizeof(buf));	
		
		if(r_count)
		{
			for(int i = 0; i < r_count; i++)
			{
				printf("buf[%d] = 0x%x\n", i, buf[i]);
			}
				send(cli_sockfd,buf,strlen(buf),0);		
		}
	}
       close(cli_sockfd);
    } 
  return 0;
}