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-rw-r--r--kern/error.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/kern/error.h b/kern/error.h
index 6cf18b7e..bdb6bda1 100644
--- a/kern/error.h
+++ b/kern/error.h
@@ -21,5 +21,6 @@
#define ERROR_NOMEM 1
#define ERROR_AGAIN 2
#define ERROR_INVAL 3
+#define ERROR_BUSY 4
#endif /* _KERN_ERROR_H */