win XP 上用VM 装linux,串口通信问题。

hi,大家好。
我在win xp上用vm装了fedora(linux) 系统，现在需要测串口通信，要在虚拟机上跑串口通信程序。
在同一台虚拟机中能完成测试不？环境如上所述。我已按网上方法设置可达到如下目的：
（1）打开一个终端，执行 cat /dev/ttyS0
（2）打开另一个终端，执行 echo hi everyone > /dev/ttyS1
在第一个终端（即 cat /dev/ttyS0) 能看到 hi everyone,说明两个串口之间通信了。

请问这种情况下，达到了我想用C程序测试串口通信所要的条件了吗？谢谢。。

我写了两个程序，一个send.c 用来发送，一个recv.c，用来接收串口信息，但互相不鸟对方，请教各位老大，我的系统环境有问题不？或我的代码有问题不？
以下是我的代码：

// send.c ..........................................

#include <stdio.h>

#include <string.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <unistd.h>

#include <termios.h>

#include <assert.h>

#include <errno.h>

#include <stdlib.h>





#define TTYS0 /dev/ttyS0

#define TTYS1 /dev/ttyS1





#define MAX_BUF_SIZE 1024*20    // define maxinum buffer length



int open_serial_port(int device)

{

    int serial_port;

    if (0 == device)

    {

        if (serial_port = open("dev/ttyS0",O_RDWR | O_NOCTTY | O_NDELAY) < 0)

        {

            perror("open /dev/ttyS0 encouter an error\n");

            exit(1);

        }

        printf("open /dev/ttyS0 success.serial_port is %d..\n",serial_port);

    }

    else

    {

        if (serial_port = open("/dev/ttyS1",O_RDWR | O_NOCTTY | O_NDELAY) < 0 )

        {

            perror("open /dev/ttyS1 encouter an error\n");

            exit(1);

        }

        printf("open /dev/ttyS1 success.serial_port is %d..\n",serial_port);

    }

    return serial_port;

}













int main(int argc,char *argv[])

{

    char *msg = "hi,everyone...";

    int sendlen = strlen(msg);

    int serial_port = open_serial_port(1);  // open /dev/ttyS0

    struct termios opt;

    tcgetattr(serial_port,&opt);

    cfmakeraw(&opt);// sets the structure specified by opt to raw mode.

                    // there is no effect on the hardware until a subsequent successful call to tcsetattr()...

    cfsetispeed(&opt,B38400);   // set input baud as 38400 bps

    cfsetospeed(&opt,B38400); 

    opt.c_cc[VMIN] = 1;

    opt.c_cc[VTIME] = 1;

    tcsetattr(serial_port,TCSANOW,&opt); //change attr as soon as possible

    while (1)

    {

        int ret_val = write(serial_port,msg,sendlen);

        assert(ret_val != -1);

        printf("write %d bytes to serial_port %d successfully...\n",ret_val,serial_port);

        sleep(3);

    }

    if (close(serial_port) == -1)

    {

        printf("close serial_port error\n");

        (1);

    }

    printf("leave...\n");

    return 0;

}

//recv.c .........................................................

#include <stdio.h>

#include <string.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <unistd.h>

#include <termios.h>

#include <assert.h>

#include <errno.h>

#include <stdlib.h>



#define TTYS0 /dev/ttyS0

#define TTYS1 /dev/ttyS1



#define MAX_BUF_SIZE 1024*20    // define maxinum buffer length



int open_serial_port(int device)

{

    int serial_port;

    if (0 == device)

    {

        if (serial_port = open("dev/ttyS0",O_RDWR | O_NOCTTY | O_NDELAY) < 0)

        {

            perror("open /dev/ttyS0 encouter an error\n");

            exit(1);

        }

        printf("open /dev/ttyS0 success,serial_port is %d...\n",serial_port);

    }

    else

    {

        if (serial_port = open("/dev/ttyS1",O_RDWR | O_NDELAY | O_NOCTTY) < 0 ) // O_NOCTTY

        {

            perror("open /dev/ttyS1 encouter an error\n");

            exit(1);

        }

        printf("open /dev/ttyS1 success,serial_port is %d...\n",serial_port);

    }

    return serial_port;

}













int main(int argc,char *argv[])

{

    char recvbuf[MAX_BUF_SIZE]; 

    int serial_port = open_serial_port(1);  // open /dev/ttyS0

    struct termios opt;

    tcgetattr(serial_port,&opt);

    cfmakeraw(&opt);// sets the structure specified by opt to raw mode.

                    // there is no effect on the hardware until a subsequent successful call to tcsetattr()...

    cfsetispeed(&opt,B38400);   // set input baud as 38400 bps

    cfsetospeed(&opt,B38400); 

    opt.c_cc[VMIN] = 1;

    opt.c_cc[VTIME] = 1;

    tcsetattr(serial_port,TCSANOW,&opt); //change attr as soon as possible

    while (1)

    {

        int ret_val = read(serial_port,recvbuf,MAX_BUF_SIZE);

        assert(ret_val != -1);

        printf("read %d bytes from  serial_port %d successfully...\n",ret_val,serial_port);

        printf("recv msg is %s...\n",recvbuf);

        sleep(3);

    }

    if (close(serial_port) == -1)

    {

        printf("close serial_port error\n");

        exit(1); 

    }

    printf("leave...\n");

    return 0;

}

代码本身很简单，请各位给点耐心，稍看一下，感激不尽，谢谢。。