tee() splits a stream into two branches. It seems straightforward, but the implementation requires buffering: if one branch is read faster than the other, the data must be held somewhere until the slower branch catches up.
sbrk((p-si_addr + (16LL<<22)) & ~4095);，推荐阅读爱思助手下载最新版本获取更多信息
Credit: The Pokémon Company。关于这个话题，爱思助手下载最新版本提供了深入分析
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