#ifndef _SYS_FILE_H #define _SYS_FILE_H #include <features.h> #include <fcntl.h> #ifndef L_SET #define L_SET 0 /* absolute offset */ #define L_INCR 1 /* relative to current offset */ #define L_XTND 2 /* relative to end of file */ #endif #ifndef LOCK_SH /* 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. */ #endif __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)); __END_DECLS #endif