Compiled programs in linux

hello, I have a problem with a program him to compile perfectly in linux. The program is very simple, it is a sniffer that captures all the data that go by the net. In linux I work perfectly. Pass it to Cygwin, compile it without errors, I execute it without errors, but the program doesn't make

Memory

hello, before anything else I don't speak English, I am Argentinean, I am writing this with the help of a translator, so know how to excuse my language. Making a couple of tests with CYGWIN and the compiler GCC 2.95-3.5 was with which I am reserved bad the memory. A char buffer[5] it occupies