The APIs that set watch points return an integer value, which is the watch point number that was just set.
设置观察点的API 将返回一个整数型值，即刚刚设置的观察点数字。
The simplest is purify_watch (addr), which sets a read-write watch point on four bytes starting at the given address.
最简单的是purify_watch (addr)，它在特定地址的四个字节上设置了一个读取-写入观察点。
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