1 files changed, 10 insertions, 0 deletions

diff --git a/lock.h b/lock.h
new file mode 100644
index 0000000..4a96cdc
--- /dev/null
+++ b/lock.h
@@ -0,0 +1,10 @@
+/* Public domain. */
+
+#ifndef LOCK_H
+#define LOCK_H
+
+extern int lock_ex(int);
+extern int lock_un(int);
+extern int lock_exnb(int);
+
+#endif