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November 6, 2026 23:10
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RLIMIT_CPU 限制 CPU time，而主程序仅测量 user time，这会导致部分程序提前结束运行。同时，sleep 这类没有产生 cpu time 的程序会显示成内部错误，不美观。
现在 watcher 从主进程接收 extra wall-clock 限制，并使用 timerfd + pidfd 或 kqueue 来进行时间限制。超时后杀死子进程，并报告 TLE。