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probably the lack of a close(). The string "Hello World." is probably short enough that the OS cached the write, but then you never properly closed the string, so the cache may not ever be written to disk. And, out of curiosity, what is the purpose of the fork()?
Regarding bartonski's comment: Umm, oh yeah, that too.
probably the lack of a close(). The string "Hello World." is probably short enough that the OS cached the write, but then you never properly closed the string, so the cache may not ever be written to disk.
Quick programmer's trick:
Whenever you have *anything* that can be opened and closed, eg. open and closed braces, malloc/free, fopen/fclose, open and close perens... you get the picture... write both at the same time, then write your code between them. This is guaranteed to save you hours of debugging.
Caveat to the above:
If you have some sort of branch make sure that any resources that you have open get closed regardless of how the conditional turns out.