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

//go:build unix

package tar

import (
	"io/fs"
	"os/user"
	"runtime"
	"strconv"
	"sync"
	"syscall"
)

func init() {
	sysStat = statUnix
}

// userMap and groupMap caches UID and GID lookups for performance reasons.
// The downside is that renaming uname or gname by the OS never takes effect.
var userMap, groupMap sync.Map // map[int]string

	case TypeFifo:
		mode |= fs.ModeNamedPipe
	}

	return mode
}

func (fi headerFileInfo) String() string {
	return fs.FormatFileInfo(fi)
}

// sysStat, if non-nil, populates h from system-dependent fields of fi.
var sysStat func(fi fs.FileInfo, h *Header, doNameLookups bool) error

const (
	// Mode constants from the USTAR spec:

pkg syscall (freebsd-386), const SYS_LSTAT = 190
pkg syscall (freebsd-386), const SYS_LSTAT ideal-int
pkg syscall (freebsd-386), const SYS_MKNODAT = 498
pkg syscall (freebsd-386), const SYS_STAT = 188
pkg syscall (freebsd-386), const SYS_STAT ideal-int
pkg syscall (freebsd-386), const SYS_STATFS = 396
pkg syscall (freebsd-386-cgo), const SYS_FSTAT = 189
pkg syscall (freebsd-386-cgo), const SYS_FSTATAT = 493

pkg syscall (freebsd-arm64), const SYS_SOCKETPAIR ideal-int
pkg syscall (freebsd-arm64), const SYS_SSTK = 70
pkg syscall (freebsd-arm64), const SYS_SSTK ideal-int
pkg syscall (freebsd-arm64), const SYS_STAT = 188
pkg syscall (freebsd-arm64), const SYS_STAT ideal-int
pkg syscall (freebsd-arm64), const SYS_STATFS = 396
pkg syscall (freebsd-arm64), const SYS_STATFS ideal-int
pkg syscall (freebsd-arm64), const SYS_SWAPCONTEXT = 423

pkg syscall (darwin-arm64), const SYS_STACK_SNAPSHOT = 365
pkg syscall (darwin-arm64), const SYS_STACK_SNAPSHOT ideal-int
pkg syscall (darwin-arm64), const SYS_STAT = 188
pkg syscall (darwin-arm64), const SYS_STAT ideal-int
pkg syscall (darwin-arm64), const SYS_STAT64 = 338
pkg syscall (darwin-arm64), const SYS_STAT64 ideal-int
pkg syscall (darwin-arm64), const SYS_STAT64_EXTENDED = 341