how to detect that serial gadget is connected

Hi Guys,

I am using gadget serial on an arm board connected to a windows host pc 
running minicom. Kernel version is 2.6.20.1.

Is there a way to detect if the gadget is connected from the gadget side?

Background is the following:
I open /dev/ttygserial in nonblocking mode on the start of my user 
application. If the board is not connected at this point,
subsequent reads on this file descriptor fail with EAGAIN. If i then 
connect the gadget, the read call still returns EAGAIN.
Re-opening /dev/ttygserial then makes it work.

Do i miss something here?

this is how i open the file:

    fd = open("/dev/ttygserial", O_RDWR | O_NOCTTY | O_NONBLOCK);
    if (fd < 0)
        perror("open");  

and this is how i read:

       int numBytes = read(fd,buff,MAILBOXSIZE);
       if (numBytes > 0) {
           //process data
       else
          perror("read");

Best regards,

Andre


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