01-11-2010
The only way split will flush output is to get an EOF on stdin.
To my knowledge there is no way to force sync on a child process, especially when it is a command line utility. You will have to roll your own version of split. Have it look for something in the input stream that forces it to fflush() the output stream.
fflush(stdin) is undefined behavior in standard C. (C89 && C99)
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