1 files changed, 35 insertions, 0 deletions
diff --git a/include/sys/file.h b/include/sys/file.h
new file mode 100644
index 000000000..2401b155a
--- /dev/null
+++ b/include/sys/file.h
@@ -0,0 +1,35 @@
+#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