github.com/stackdocker/rkt@v0.10.1-0.20151109095037-1aa827478248/Godeps/_workspace/src/golang.org/x/sys/unix/flock.go (about)

     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  }