fdset.go

     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  	for i := range fds.Bits {
    27  		fds.Bits[i] = 0
    28  	}
    29  }
    30
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