1 /* ========================================================================

2 * Copyright 1988-2006 University of Washington

3 *

4 * Licensed under the Apache License, Version 2.0 (the "License");

5 * you may not use this file except in compliance with the License.

6 * You may obtain a copy of the License at

7 *

8 * http://www.apache.org/licenses/LICENSE-2.0

9 *

10 *

11 * ========================================================================

12 */

13

14 /*

15 * Program: flock() emulation via fcntl() locking

16 *

17 * Author: Mark Crispin

18 * Networks and Distributed Computing

19 * Computing & Communications

20 * University of Washington

21 * Administration Building, AG-44

22 * Seattle, WA 98195

23 * Internet: MRC@CAC.Washington.EDU

24 *

25 * Date: 10 April 2001

26 * Last Edited: 30 August 2006

27 */

28

29 /* Cygwin does not seem to have the design flaw in fcntl() locking that

30 * most other systems do (see flocksim.c for details). If some cretin

31 * decides to implement that design flaw, then Cygwin will have to use

32 * flocksim. Also, we don't test NFS either

33 */

34

35

36 #define flock flocksim /* use ours instead of theirs */

37

38 #undef LOCK_SH

39 #define LOCK_SH 1 /* shared lock */

40 #undef LOCK_EX

41 #define LOCK_EX 2 /* exclusive lock */

42 #undef LOCK_NB

43 #define LOCK_NB 4 /* no blocking */

44 #undef LOCK_UN

45 #define LOCK_UN 8 /* unlock */

46

47

48 /* Function prototypes */

49

50 int flocksim (int fd,int operation);