写文件无法追加数据，且把前边的数据覆盖掉了

int write_appendData(void)
{
    int PARA_BUFFERSIZE=100;
    char LocalBuffer[PARA_BUFFERSIZE],keybuff[32],*sp,*ep,newbuff[PARA_BUFFERSIZE];
    int  len1;
    char *filein="/linkage1.txt";
    int fdin,fdout,ret=0;
    char temp1[]="abc \n";
    char temp2[]="def \n";
    
        /* 只读 打开 */
     fdin=open(filein,O_RDONLY, 0);
     rt_kprintf("fdin1=%d \n",fdin);
     if(fdin<0)
     {
         fdin = open(filein, O_WRONLY | O_CREAT | O_TRUNC, 0);
         if(fdin>0)
         {
             rt_kprintf("temp2 size=%d \n",sizeof(temp2));
            write(fdin, temp2,sizeof(temp2));
       } 
     } 
  close(fdin);

   //文件内容已经写有东西了
    fdin=open(filein,O_RDWR|O_APPEND, 0);
//    lseek(fdin,fdin,SEEK_END);
    rt_kprintf("fdin2=%d \n",fdin);
    if(fdin>0)
    {
        rt_kprintf("temp1 size=%d \n",sizeof(temp2));
        write(fdin, temp1,sizeof(temp1));
    } 
    close(fdin); 
    
     return 0;
}

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