为什么Go自带的日志默认输出到os.Stderr？

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mb5fe55acf14b1a 2020-12-23 11:53:00

为什么Go自带的日志默认输出到os.Stderr？

Note that the Go runtime writes to standard error for panics and crashes; closing Stderr may cause those messages to go elsewhere, perhaps to a file opened later.

os - The Go Programming Language https://golang.org/pkg/os/

Variables

Portable analogs of some common system call errors.

Errors returned from this package may be tested against these errors with errors.Is.

var (
    // ErrInvalid indicates an invalid argument.
    // Methods on File will return this error when the receiver is nil.
    ErrInvalid = errInvalid() // "invalid argument"

    ErrPermission       = errPermission()       // "permission denied"
    ErrExist            = errExist()            // "file already exists"
    ErrNotExist         = errNotExist()         // "file does not exist"
    ErrClosed           = errClosed()           // "file already closed"
    ErrNoDeadline       = errNoDeadline()       // "file type does not support deadline"
    ErrDeadlineExceeded = errDeadlineExceeded() // "i/o timeout"
)

Stdin, Stdout, and Stderr are open Files pointing to the standard input, standard output, and standard error file descriptors.

Note that the Go runtime writes to standard error for panics and crashes; closing Stderr may cause those messages to go elsewhere, perhaps to a file opened later.

var (
    Stdin  = NewFile(uintptr(syscall.Stdin), "/dev/stdin")
    Stdout = NewFile(uintptr(syscall.Stdout), "/dev/stdout")
    Stderr = NewFile(uintptr(syscall.Stderr), "/dev/stderr")
)

Args hold the command-line arguments, starting with the program name.