Understanding Android File Descriptor Issues: fdsan and fdtrack Mechanisms
This article explains what file descriptors are, how the Linux kernel manages them, and examines Android’s two detection mechanisms—fdsan and fdtrack—by detailing their design concepts and implementation, helping readers grasp and troubleshoot file‑descriptor anomalies in Android systems.
本文的目标是帮助大家深入理解 Android 系统资源异常之文件描述符异常，对于文件描述符异常的通用检测机制，当前包括 fdtrack 和 fdsan 两种机制展开剖析。
通过阅读本篇文章，期望读者可以了解到：
1）什么是文件描述符
2）Linux 内核中如何使用文件描述符来管理进程打开文件资源
3）Android fdsan 机制设计思路与实现
4）Android fdtrack 机制设计思路与实现
本文详细介绍了文件描述符的概念、Linux 内核中文件描述符的管理机制、Android 中的 fdsan 和 fdtrack 机制的设计思路与实现。
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