识别 IPC 连接的路径


【Identifying paths for IPC connections】

net.connect()net.createConnection()server.listen()socket.connect() 采用 path 参数来识别 IPC 端点。

在 Unix 系统中,本地域也被称为 Unix 域。路径是一个文件系统路径名。它会被截断到与操作系统相关的长度,即 sizeof(sockaddr_un.sun_path) - 1。在 Linux 上典型值为 107 字节,在 macOS 上为 103 字节。如果 Node.js 的 API 抽象创建了 Unix 域套接字,它也会取消链接该 Unix 域套接字。例如,net.createServer() 可能创建一个 Unix 域套接字,而 server.close() 会取消链接它。但如果用户在这些抽象之外创建 Unix 域套接字,用户将需要手动删除它。当 Node.js API 创建了 Unix 域套接字但程序随后崩溃时,同样适用。简而言之,Unix 域套接字将在文件系统中可见,并会持续存在,直到被取消链接。

【On Unix, the local domain is also known as the Unix domain. The path is a filesystem pathname. It gets truncated to an OS-dependent length of sizeof(sockaddr_un.sun_path) - 1. Typical values are 107 bytes on Linux and 103 bytes on macOS. If a Node.js API abstraction creates the Unix domain socket, it will unlink the Unix domain socket as well. For example, net.createServer() may create a Unix domain socket and server.close() will unlink it. But if a user creates the Unix domain socket outside of these abstractions, the user will need to remove it. The same applies when a Node.js API creates a Unix domain socket but the program then crashes. In short, a Unix domain socket will be visible in the filesystem and will persist until unlinked.】

在 Windows 上,本地域使用命名管道来实现。路径必须指向 \?\pipe\\\.\pipe\ 中的一个条目。任何字符都是允许的,但后者可能会对管道名称进行一些处理,例如解析 .. 序列。尽管看起来可能不是这样,管道命名空间是平面的。管道不会持久存在。当最后一个对它的引用关闭时,管道会被移除。与 Unix 域套接字不同,Windows 会在拥有它的进程退出时关闭并移除管道。

【On Windows, the local domain is implemented using a named pipe. The path must refer to an entry in \\?\pipe\ or \\.\pipe\. Any characters are permitted, but the latter may do some processing of pipe names, such as resolving .. sequences. Despite how it might look, the pipe namespace is flat. Pipes will not persist. They are removed when the last reference to them is closed. Unlike Unix domain sockets, Windows will close and remove the pipe when the owning process exits.】

JavaScript 字符串转义要求路径使用额外的反斜杠进行转义,例如:

【JavaScript string escaping requires paths to be specified with extra backslash escaping such as:】

net.createServer().listen(
  path.join('\\\\?\\pipe', process.cwd(), 'myctl'));