指定打开进程的进程标识符。
返回在系统中每个进程的进程标识符。
Retrieves the process identifier for each process object in the system.
返回值（上例中的PID）是进程标识符。
The return value (PID in the above example) is a process identifier.
文件描述符只不过是进程的标识符。
The file descriptor is merely an identifier for the process.
文件描述符只不过是进程的标识符。
The file descriptor is merely an identifier for the process.
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