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Message: [QUOTE="Walter Roberson, post: 2453356"] How about something like this: Open a file w+. Write known data into it. fseek() back to the beginning of the file. gets() with a buffer at least as big as the data to be written. Within standard C, there is nothing that could sneak in and change the file contents "underneath you". Unix has multiprocessing and another Unix process could change the file, but that's not the fault of standard C. And besides, you could run this on a system that did not offer multiple processes. (Now, if you start going in and bashing The One True Process with a debugger, clearly C would not be able to offer any guarantees of anything at all.) [/QUOTE]