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fdset.go (753B)

      1 // Copyright 2019 The Go Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 //go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
      6 
      7 package unix
      8 
      9 // Set adds fd to the set fds.
     10 func (fds *FdSet) Set(fd int) {
     11 	fds.Bits[fd/NFDBITS] |= (1 << (uintptr(fd) % NFDBITS))
     12 }
     13 
     14 // Clear removes fd from the set fds.
     15 func (fds *FdSet) Clear(fd int) {
     16 	fds.Bits[fd/NFDBITS] &^= (1 << (uintptr(fd) % NFDBITS))
     17 }
     18 
     19 // IsSet returns whether fd is in the set fds.
     20 func (fds *FdSet) IsSet(fd int) bool {
     21 	return fds.Bits[fd/NFDBITS]&(1<<(uintptr(fd)%NFDBITS)) != 0
     22 }
     23 
     24 // Zero clears the set fds.
     25 func (fds *FdSet) Zero() {
     26 	clear(fds.Bits[:])
     27 }