Golang file class internal structure

Golang is a high-performance, scalable programming language with powerful file processing capabilities. In Golang, the internal structure of the file class is the key to implementing file operations. In this article, PHP editor Xigua will introduce the internal structure of the Golang file class to help readers better understand the principles and methods of file processing. Whether it is reading file content, writing file data, or creating or deleting files, it is very important for developers to understand the internal structure of Golang file classes. Let’s take a closer look!

Question content

Go's File class If you look at the underlying implementation in go/src/os/types.go yes:

type File struct {
*file // os specific
}

As far as I know, this type is the intersection of a public-facing user API and an internal implementation that varies depending on the operating system. It's still not clear to me how (or where) the runtime/compiler replaces *file to implement a specific operating system.

Solution

In the same os package, file is defined in file_285537dc3dedfc3dd5359bee4c9ee546. go中.

For example, for UNIX systems, we have file_unix.go, containing

// file is the real representation of *File.
// The extra level of indirection ensures that no clients of os
// can overwrite this data, which could cause the finalizer
// to close the wrong file descriptor.
type file struct {
    pfd         poll.FD
    name        string
    dirinfo     *dirInfo // nil unless directory being read
    nonblock    bool     // whether we set nonblocking mode
    stdoutOrErr bool     // whether this is stdout or stderr
    appendMode  bool     // whether file is opened for appending
}

See the Windows implementation . here file_windows.go

The way the build tool selects the correct file is configurable and tracked in the

build tool . This can be overridden via GOOS as an environment variable, or by changing the configuration setting. Build using GOOS and GOARCH and look at filenames (among other things) to select or ignore specific suffixes such as source_windows.go.

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