1 files changed, 8 insertions, 0 deletions

diff --git a/include/unistd.h b/include/unistd.h
index a2eba2e54268..989a459650fb 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -48,6 +48,13 @@
 #define	NULL		0	/* null pointer constant */
 #endif
 
+#ifndef _POSIX_SOURCE
+#define F_ULOCK         0	/* unlock locked section */
+#define F_LOCK          1	/* lock a section for exclusive use */
+#define F_TLOCK         2	/* test and lock a section for exclusive use */
+#define F_TEST          3	/* test a section for locks by other processes */
+#endif
+
 __BEGIN_DECLS
 void	 _exit __P((int)) __dead2;
 int	 access __P((const char *, int));
@@ -140,6 +147,7 @@ int	 initgroups __P((const char *, int));
 int	 iruserok __P((unsigned long, int, const char *, const char *));
 int	 issetugid __P((void));
 int	 lchown __P((const char *, uid_t, gid_t));
+int     lockf __P((int, int, off_t));
 char	*mkdtemp __P((char *));
 int	 mknod __P((const char *, mode_t, dev_t));
 int	 mkstemp __P((char *));