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It is possible to have zero-sized memory blocks (i.e. blocks consisting solely of an MCB header). The ALLOC function does not refuse to allocate zero-sized blocks. In addition, zero-sized blocks may be inevitably created in the course of calling other functions. For example, if an existing allocation is resized to be exactly one paragraph smaller, DOS will be forced to create precisely such a zero-sized MCB.，推荐阅读体育直播获取更多信息
Фото: Alexander Manzyuk / Reuters，详情可参考heLLoword翻译官方下载
void*next_free;。safew官方下载对此有专业解读