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1 // Copyright 2019 The Go Authors. All rights reserved.
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2 // Use of this source code is governed by a BSD-style
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3 // license that can be found in the LICENSE file.
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4
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5 //go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
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6 // +build aix darwin dragonfly freebsd linux netbsd openbsd solaris zos
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7
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8 package unix
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9
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10 // Set adds fd to the set fds.
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11 func (fds *FdSet) Set(fd int) {
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12 fds.Bits[fd/NFDBITS] |= (1 << (uintptr(fd) % NFDBITS))
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13 }
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14
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15 // Clear removes fd from the set fds.
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16 func (fds *FdSet) Clear(fd int) {
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17 fds.Bits[fd/NFDBITS] &^= (1 << (uintptr(fd) % NFDBITS))
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18 }
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19
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20 // IsSet returns whether fd is in the set fds.
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21 func (fds *FdSet) IsSet(fd int) bool {
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22 return fds.Bits[fd/NFDBITS]&(1<<(uintptr(fd)%NFDBITS)) != 0
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23 }
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24
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25 // Zero clears the set fds.
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26 func (fds *FdSet) Zero() {
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27 for i := range fds.Bits {
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28 fds.Bits[i] = 0
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29 }
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30 }
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