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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 // +build aix darwin solaris
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6
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7 package poll
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8
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9 import (
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10 "syscall"
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11 )
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12
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13 // Use a helper function to call fcntl. This is defined in C in
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14 // libgo/runtime.
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15 //extern __go_fcntl_uintptr
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16 func libc_fcntl(uintptr, uintptr, uintptr) (uintptr, uintptr)
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17
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18 func fcntl(fd int, cmd int, arg int) (int, error) {
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19 syscall.Entersyscall()
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20 r, e := libc_fcntl(uintptr(fd), uintptr(cmd), uintptr(arg))
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21 syscall.Exitsyscall()
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22 if e != 0 {
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23 return int(r), syscall.Errno(e)
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24 }
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25 return int(r), nil
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26 }
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