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int brk(void *end_data_segment);
end_data_segment: [in] the new end of the data segment.
brk sets the end of the data segment to the value specified by
end_data_segment. This value must be greater than the end
of the text segment and lower than 16KB before the end of the stack.
Note: the brk syscall is in never called directly. It is wrapped by a libc function that changes the return value. The sbrk fucntion is also implemented as a wrapper.
Returns the new end of the data segment. (If it is not equal the the requested end, then there has been an error and the memory couldn't be allocated.)
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