In nearly all versions of Unix, SBRK can be used with negative arguments to achieve this effect.

在几乎所有的UNIX版本中，sbrk可以使用负参数达到这个效果。

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Because SBRK may give back more memory than we ask for, we leak some memory at the end of the heap.

由于sbrk可能会交回比我们请求的更多的内存，所以在堆(heap)的末端会遗漏一些内存。

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SBRK moves the current system break by the number of bytes in its argument, and then returns the new system break.

sbrk根据参数中给出的字节数移动当前系统中断点，然后返回新的系统中断点。

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