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- #ifndef _SYS_FILE_H
- #define _SYS_FILE_H
-
- #include <features.h>
-
- #include <fcntl.h>
-
- #define L_SET 0 /* absolute offset */
- #define L_INCR 1 /* relative to current offset */
- #define L_XTND 2 /* relative to end of file */
-
- /* Operations for the `flock' call. */
- #define LOCK_SH 1 /* Shared lock. */
- #define LOCK_EX 2 /* Exclusive lock. */
- #define LOCK_UN 8 /* Unlock. */
-
- /* Can be OR'd in to one of the above. */
- #define LOCK_NB 4 /* Don't block when locking. */
-
- __BEGIN_DECLS
-
- /* Apply or remove an advisory lock, according to OPERATION,
- on the file FD refers to. */
- extern int __flock __P ((int __fd, int __operation));
- extern int flock __P ((int __fd, int __operation));
-
- __END_DECLS
-
- #endif
-