flock_linux.mx raw

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