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1 // Copyright 2014 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 dragonfly || freebsd || linux || netbsd || openbsd
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6 // +build dragonfly freebsd linux netbsd openbsd
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7
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8 package unix
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9
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10 import "unsafe"
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11
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12 // fcntl64Syscall is usually SYS_FCNTL, but is overridden on 32-bit Linux
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13 // systems by fcntl_linux_32bit.go to be SYS_FCNTL64.
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14 var fcntl64Syscall uintptr = SYS_FCNTL
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15
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16 func fcntl(fd int, cmd, arg int) (int, error) {
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17 valptr, _, errno := Syscall(fcntl64Syscall, uintptr(fd), uintptr(cmd), uintptr(arg))
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18 var err error
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19 if errno != 0 {
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20 err = errno
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21 }
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22 return int(valptr), err
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23 }
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24
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25 // FcntlInt performs a fcntl syscall on fd with the provided command and argument.
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26 func FcntlInt(fd uintptr, cmd, arg int) (int, error) {
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27 return fcntl(int(fd), cmd, arg)
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28 }
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29
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30 // FcntlFlock performs a fcntl syscall for the F_GETLK, F_SETLK or F_SETLKW command.
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31 func FcntlFlock(fd uintptr, cmd int, lk *Flock_t) error {
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32 _, _, errno := Syscall(fcntl64Syscall, fd, uintptr(cmd), uintptr(unsafe.Pointer(lk)))
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33 if errno == 0 {
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34 return nil
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35 }
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36 return errno
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37 }
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