//sys	Readlink(path string, buf []byte) (n int, err error)
//sys	Readlinkat(dirfd int, path string, buf []byte) (n int, err error)
//sys	Rename(from string, to string) (err error)
//sys	Renameat(fromfd int, from string, tofd int, to string) (err error)
//sys	Revoke(path string) (err error)
//sys	Rmdir(path string) (err error)
//sys	Seek(fd int, offset int64, whence int) (newoffset int64, err error) = SYS_LSEEK

//sys	pwrite(fd int, p []byte, offset int64) (n int, err error)
//sys	read(fd int, p []byte) (n int, err error)
//sys	Reboot(how int) (err error)
//sys	Rename(from string, to string) (err error)
//sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
//sys	Rmdir(path string) (err error)
//sys	Seek(fd int, offset int64, whence int) (newoffset int64, err error) = lseek
//sysnb	Setegid(egid int) (err error)

//go:cgo_import_dynamic libc_read read "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_Reboot reboot "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_Rename rename "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_Renameat renameat "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_Rmdir rmdir "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_lseek lseek "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_Setegid setegid "libc.a/shr_64.o"

func Readlink(path string, buf []byte) (n int, err error) {
	return readlinkat(_AT_FDCWD, path, buf)
}

func Rename(oldpath string, newpath string) (err error) {
	return Renameat(_AT_FDCWD, oldpath, _AT_FDCWD, newpath)
}

func Rmdir(path string) error {
	return unlinkat(_AT_FDCWD, path, _AT_REMOVEDIR)
}

//sys	symlinkat(oldpath string, newdirfd int, newpath string) (err error)

// of the name identifier.
//
// TODO(mdempsky): I suspect there's no need for separate fpos and
// npos.
func NewFunc(fpos, npos src.XPos, sym *types.Sym, typ *types.Type) *Func {
	name := NewNameAt(npos, sym, typ)
	name.Class = PFUNC
	sym.SetFunc(true)

	fn := &Func{Nname: name}
	fn.pos = fpos
	fn.op = ODCLFUNC
	// Most functions are ABIInternal. The importer or symabis
	// pass may override this.

	// Don't use LookupNum; it interns the resulting string, but these are all unique.
	sym := typecheck.Lookup(fmt.Sprintf("%s%d", obj.StaticNamePref, statuniqgen))
	statuniqgen++

	n := ir.NewNameAt(base.Pos, sym, t)
	sym.Def = n

	n.Class = ir.PEXTERN
	typecheck.Target.Externs = append(typecheck.Target.Externs, n)

	n.Linksym().Set(obj.AttrStatic, true)
	return n
}