default_unix.go

// Copyright 2014 The LevelDB-Go and Pebble Authors. All rights reserved. Use
// of this source code is governed by a BSD-style license that can be found in
// the LICENSE file.

//go:build darwin || dragonfly || freebsd || (linux && arm) || netbsd || openbsd || solaris
// +build darwin dragonfly freebsd linux,arm netbsd openbsd solaris

package vfs

import (
	"os"
	"syscall"

	"github.com/cockroachdb/errors"
)

func wrapOSFile(osFile *os.File) File {
	return &unixFile{File: osFile, fd: osFile.Fd()}
}

func (defaultFS) OpenDir(name string) (File, error) {
	f, err := os.OpenFile(name, syscall.O_CLOEXEC, 0)
	if err != nil {
		return nil, errors.WithStack(err)
	}
	return &unixFile{f, InvalidFd}, nil
}

// Assert that unixFile implements vfs.File.
var _ File = (*unixFile)(nil)

type unixFile struct {
	*os.File
	fd uintptr
}

func (f *unixFile) Attributes() FileAttributes {
	// No support for sync_file_range.
	return FileAttributes{CanSyncTo: false}
}

func (f *unixFile) Preallocate(offset, length int64) error {
	return preallocExtend(f.fd, offset, length)
}

func (f *unixFile) SyncData() error    { return f.Sync() }
func (f *unixFile) SyncTo(int64) error { return f.Sync() }