追加模式仅支持现有的X code项目，带有有相同的Unity iOS版本生成。

Append mode is supported only for the existing XCode projects generated with the same Unity iOS version.

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如果文件设置了‘a’属性，数据只能采用追加模式，仅仅超级用户或者拥有CAP _ LINUX _ IMMUTABLE能力的进程可以设置和删除该属性。

A file with the 'a' attribute set can only be open in append mode for writing. Only the superuser or a process possessing the CAP_LINUX_IMMUTABLE capability can set or clear this attribute.

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BIN模式：将审核事件记录到两个交换使用的临时BIN文件中，然后将它们追加到一个审核跟踪文件中。

BIN mode: Records the audit events to two alternating temporary BIN files, and then appends them to a single audit trail file.

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