/proc文件系统为应用程序提供了一种访问内核信息的方式。每个/proc/PID子目录包含与该PID匹配的进程信息。此外，/proc下的其他文件和目录提供了程序可以读取甚至修改的系统范围的信息。通过uname()系统调用，我们可以发现应用程序运行的UNIX实现和机器类型。
Summary
The /proc file system exposes a range of kernel information to application programs.
Each /proc/PID subdirectory contains files and subdirectories that provide information about the process whose ID matches PID. Various other files and directories under /proc expose system-wide information that programs can read and, in some cases, modify.
The uname() system call allows us to discover the UNIX implementation and the type of machine on which an application is running.
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