// license that can be found in the LICENSE file.

package poll

import (
	"errors"
	"internal/stringslite"
	"io"
	"sync"
	"syscall"
	"time"
)

type FD struct {
	// Lock sysfd and serialize access to Read and Write methods.
	fdmu fdMutex

	Destroy func()

	// deadlines
	rmu       sync.Mutex
	wmu       sync.Mutex
	raio      *asyncIO
	waio      *asyncIO
	rtimer    *time.Timer

// If there is an error, it will be of type [*PathError].
func (file *File) Stat() (FileInfo, error) {
	if file == nil {
		return nil, ErrInvalid
	}
	return statHandle(file.name, file.pfd.Sysfd)
}

// stat implements both Stat and Lstat of a file.
func stat(funcname, name string, followSurrogates bool) (FileInfo, error) {
	if len(name) == 0 {

// methods to stop working.
func (file *File) Fd() uintptr {
	if file == nil {
		return uintptr(syscall.InvalidHandle)
	}
	return uintptr(file.pfd.Sysfd)
}

// newFile returns a new File with the given file handle and name.
// Unlike NewFile, it does not check that h is syscall.InvalidHandle.
func newFile(h syscall.Handle, name string, kind string) *File {

	// opened in blocking mode. The File will continue to work,
	// but any blocking operation will tie up a thread.
	if f.nonblock {
		f.pfd.SetBlocking()
	}

	return uintptr(f.pfd.Sysfd)
}

// NewFile returns a new File with the given file descriptor and
// name. The returned value will be nil if fd is not a valid file
// descriptor. On Unix systems, if the file descriptor is in

				fileNames = append(fileNames, filepath.Join(path, m.BuildID[:2], m.BuildID[2:]+".debug"))
			}
			if m.File != "" {
				// Try both the basename and the full path, to support the same directory
				// structure as the perf symfs option.
				fileNames = append(fileNames, filepath.Join(path, baseName))
				fileNames = append(fileNames, filepath.Join(path, noVolumeFile))
				// Other locations: use the same search paths as GDB, according to