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fopen is available on any hosted ANSI C system and operates according
to ANSI C. The existence and semantics of open depend on each system.
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On Unix, open and related function (such as lseek, read, write) each
results in a transfer across protection boundaries into the kernel
and do not use provide buffering in the user space of the process.
fopen is more portable and generally more efficient. open allows
additional, non-portable operations.
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