malloc_trim 函数

malloc_trim函数是用于释放堆顶的空闲内存的。它通过调用sbrk(2)函数并传递适当的参数来尝试释放堆顶的空闲内存。如果成功释放了内存并将其返回给系统，则malloc_trim函数返回1；如果无法释放任何内存，则返回0。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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