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-rw-r--r--util/macros.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/util/macros.h b/util/macros.h
index d071793..4a773a2 100644
--- a/util/macros.h
+++ b/util/macros.h
@@ -29,6 +29,10 @@
#define ARRAY_SIZE(array) (sizeof(array) / sizeof((array)[0]))
#define ARRAY_END(array) (&(array)[ARRAY_SIZE(array)])
+/* Used to name the elements of the array passed to pipe. */
+#define PIPE_READ 0
+#define PIPE_WRITE 1
+
/* Used for unused parameters to silence gcc warnings. */
#define UNUSED __attribute__((__unused__))