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-rw-r--r--include/sys/file.h35
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