github.com/giovannyortegon/go@v0.0.0-20220115155912-8890063f5bdd/src/pkg/mod/golang.org/x/sys@v0.0.0-20210927094055-39ccf1dd6fa6/unix/fdset.go (about)

     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  // +build aix darwin dragonfly freebsd linux netbsd openbsd solaris zos
     7  
     8  package unix
     9  
    10  // Set adds fd to the set fds.
    11  func (fds *FdSet) Set(fd int) {
    12  	fds.Bits[fd/NFDBITS] |= (1 << (uintptr(fd) % NFDBITS))
    13  }
    14  
    15  // Clear removes fd from the set fds.
    16  func (fds *FdSet) Clear(fd int) {
    17  	fds.Bits[fd/NFDBITS] &^= (1 << (uintptr(fd) % NFDBITS))
    18  }
    19  
    20  // IsSet returns whether fd is in the set fds.
    21  func (fds *FdSet) IsSet(fd int) bool {
    22  	return fds.Bits[fd/NFDBITS]&(1<<(uintptr(fd)%NFDBITS)) != 0
    23  }
    24  
    25  // Zero clears the set fds.
    26  func (fds *FdSet) Zero() {
    27  	for i := range fds.Bits {
    28  		fds.Bits[i] = 0
    29  	}
    30  }