// Copyright 2019 The Go Authors. All rights reserved.

// Use of this source code is governed by a BSD-style

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

// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris

package unix

// Set adds fd to the set fds.

func (fds *FdSet) Set(fd int) {

	fds.Bits[fd/NFDBITS] |= (1 << (uintptr(fd) % NFDBITS))

}

// Clear removes fd from the set fds.

func (fds *FdSet) Clear(fd int) {

	fds.Bits[fd/NFDBITS] &^= (1 << (uintptr(fd) % NFDBITS))

}

// IsSet returns whether fd is in the set fds.

func (fds *FdSet) IsSet(fd int) bool {

	return fds.Bits[fd/NFDBITS]&(1<<(uintptr(fd)%NFDBITS)) != 0

}

// Zero clears the set fds.

func (fds *FdSet) Zero() {

	for i := range fds.Bits {

		fds.Bits[i] = 0

	}

}