Serial eagain error

[robinsonvpanicker]

When i try to write and read data like ABC through serial port to a hardware device, used to check whether transmission of traffic is done without loss, the reading fails and the reason given is eagain error: temporarily resource unavailable when it is being read only by me........can anybody suggest what is wrong? ....

[wje_lf]

When I do this at the command line:

man 2 read

I get this explanation for the EAGAIN error:

...... EAGAIN Non-blocking I/O has been selected using O_NONBLOCK
              and no data was immediately available for reading.

If you're using nonblocking I/O, use select() to inform you when data is available (for reading) or there's room for output data (for writing).

Hope this helps.