This uses /proc/self/mem to write to two unwritable memory pages. The first is a read-only page that the code itself maps. The second is a code page belonging to libc itself (the getchar function).
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，更多细节参见权威学术研究网
强风天气席卷多地区 日本东部及北部需警惕黎明时段恶劣气候
图片来源：米哈伊尔·沃斯克列先斯基/俄新社
counts := word_count(text);
6ENGINE = MergeTree