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'close' function on serial port descriptor blocks in linux

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http://stackoverflow.com – Recently I've found a problem which is quite new for me and I'd appreciate advice. I'm doing serial communication on Linux using termios functions. I actually don't use real serial port, but virtual gadget serial driver /dev/ttyGS0. File descriptor is opened as non-blocking. My program periodically generates data and sends it to /dev/ttyGS0. There is no information if the other end reads it or not. If it does not, some internal fifo fills up and write returns "would block" error. So far so good, I have no problems with that. Problem is, when I want to close such file descriptor with filled f (HowTos)