错误提示如下：

root:/tmp> ./bf537_send 192.168.10.226 9000

Destination IP Address:192.168.10.226

Destination Port:9000

How many packets you want to send?

2

check if Create Session error

ERROR:Can't retrieve login name

root:/tmp>

原因及解决方法如下：

　　板子上的文件系统不需要用户名就可以直接登录，而在JRTPLIB库中的RTPSession中的

Create->InternalCreate->CreateCNAME中，有对用户名进行一定操作，

其中的getlogin_r()，getlogin()和getenv()操作都会因为用户名为空，

而返回错误ERR_RTP_SESSION_CANTGETLOGINNAME。

　　我们可以通过修改JRTPLIB库（我所使用的版本号为3.7.1）的CreateCNAME源代码来为系统默认设置一个用户名。

在RTPSession.cpp的第1400行左右，找到：

if (!gotlogin)                                                                 

{                                                                         

  char *logname = getenv("LOGNAME");                                      

  if (logname = = 0)                                                         

    return ERR_RTP_SESSION_CANTGETLOGINNAME;                     

  strncpy((char *)buffer,logname,*bufferlength);                                 

}                                                                          

将其修改为：

if (!gotlogin)                                                                

{                                                                          

  char *logname = getenv( "LOGNAME" );                                      

  if( 0 = = logname )                                                        

  {                                                                     

    printf( "Can't getenv LOGNAME, we will use \"root\" instead\n" );             

    strncpy( ( char * )buffer, "root", *bufferlength );                            

  }                                                                     

  else                                                                   

  {                                                                      

    strncpy( ( char * )buffer, logname, *bufferlength );                          

  }                                                                     

}