You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: vfsflags_unix.go
    path of file: ./repos/rclone/vfs/vfsflags
    
    the code of the file until where you have to start completion: //go:build linux || darwin || freebsd
// +build linux darwin freebsd

package vfsflags

import (
	"github.com/rclone/rclone/fs/config/flags"
	"gith
    
func platformFlags(flagSet *pflag.FlagSet) {
	Opt.Umask = unix.Umask(0) // read the umask
	unix.Umask(Opt.Umask)     // set it back to what it was
	flags.IntVarP(flagSet, &Opt.Umask, "umask", "", Opt.Umask, "Override the permission bits set by the filesystem (not supported on Windows)", "VFS")
	Opt.UID = uint32(unix.Geteuid())
	Opt.GID = uint32(unix.Getegid())
	flags.Uint32VarP(flagSet, &Opt.UID, "uid", "", Opt.UID, "Override the uid field set by the filesystem (not supported on Windows)", "VFS")
	flags.Uint32VarP(flagSet, &Opt.GID, "gid", "", Opt.GID, "Override the gid field set by the filesystem (not supported on Windows)", "VFS")
}