process.umask()
稳定性: 0 - 已弃用。不带参数调用
process.umask() 会导致进程范围的 umask 被写入两次。这在线程之间引入了竞争条件，并且是一个潜在的安全漏洞。没有安全的、跨平台的替代 API。¥Stability: 0 - Deprecated. Calling process.umask() with no argument causes
the process-wide umask to be written twice. This introduces a race condition
between threads, and is a potential security vulnerability. There is no safe,
cross-platform alternative API.
process.umask() 返回 Node.js 进程的文件模式创建掩码。子进程从父进程继承掩码。
¥process.umask() returns the Node.js process's file mode creation mask. Child
processes inherit the mask from the parent process.