The strnlen_user function is used just like strnlen but assumes that the buffer is available in user space.
strnlen_user函数也能像strnlen 那样使用，但前提是缓冲区在用户空间可用。
The strnlen_user function is used just like strnlen but assumes that the buffer is available in user space.
strnlen_user函数也能像strnlen 那样使用，但前提是缓冲区在用户空间可用。
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