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Diffstat (limited to 'imap/src/osdep/unix/flockcyg.h')
| -rw-r--r-- | imap/src/osdep/unix/flockcyg.h | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/imap/src/osdep/unix/flockcyg.h b/imap/src/osdep/unix/flockcyg.h new file mode 100644 index 00000000..0bc53623 --- /dev/null +++ b/imap/src/osdep/unix/flockcyg.h @@ -0,0 +1,50 @@ +/* ======================================================================== + * Copyright 1988-2006 University of Washington + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * + * ======================================================================== + */ + +/* + * Program: flock() emulation via fcntl() locking + * + * Author: Mark Crispin + * Networks and Distributed Computing + * Computing & Communications + * University of Washington + * Administration Building, AG-44 + * Seattle, WA 98195 + * Internet: MRC@CAC.Washington.EDU + * + * Date: 10 April 2001 + * Last Edited: 30 August 2006 + */ + +/* Cygwin does not seem to have the design flaw in fcntl() locking that + * most other systems do (see flocksim.c for details). If some cretin + * decides to implement that design flaw, then Cygwin will have to use + * flocksim. Also, we don't test NFS either + */ + + +#define flock flocksim /* use ours instead of theirs */ + +#undef LOCK_SH +#define LOCK_SH 1 /* shared lock */ +#undef LOCK_EX +#define LOCK_EX 2 /* exclusive lock */ +#undef LOCK_NB +#define LOCK_NB 4 /* no blocking */ +#undef LOCK_UN +#define LOCK_UN 8 /* unlock */ + + +/* Function prototypes */ + +int flocksim (int fd,int operation); |