golang fdset 代码
文件路径：/src/cmd/vendor/golang.org/x/sys/unix/fdset.go
/ 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.
/go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
/ +build aix darwin dragonfly freebsd linux netbsd openbsd solaris zos
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
}
}