vendor/github.com/fsouza/go-dockerclient/external/golang.org/x/sys/unix/flock.go

   1 // +build linux darwin freebsd openbsd netbsd dragonfly
   2
   3 // Copyright 2014 The Go Authors. All rights reserved.
   4 // Use of this source code is governed by a BSD-style
   5 // license that can be found in the LICENSE file.
   6
   7 // +build darwin dragonfly freebsd linux netbsd openbsd
   8
   9 package unix
  10
  11 import "unsafe"
  12
  13 // fcntl64Syscall is usually SYS_FCNTL, but is overridden on 32-bit Linux
  14 // systems by flock_linux_32bit.go to be SYS_FCNTL64.
  15 var fcntl64Syscall uintptr = SYS_FCNTL
  16
  17 // FcntlFlock performs a fcntl syscall for the F_GETLK, F_SETLK or F_SETLKW command.
  18 func FcntlFlock(fd uintptr, cmd int, lk *Flock_t) error {
  19         _, _, errno := Syscall(fcntl64Syscall, fd, uintptr(cmd), uintptr(unsafe.Pointer(lk)))
  20         if errno == 0 {
  21                 return nil
  22         }
  23         return errno
  24 }