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I am trying to read the serial port by the following command after opening the device. read(fd,&UBX_buffer,1); for it was working fine but for some reason it stopped working and while I was debugging it sometimes the read function returns -1 and other times returns an integer value. what could possibly do that. I really don't know what to change because it was working fine previously.

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Does This help? –  Mitch Jun 7 '13 at 20:00
    
When syscalls fail, check the value of errno to find out why. –  psusi Jun 7 '13 at 21:39
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