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-rw-r--r--include/xs.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/xs.h b/include/xs.h
index 2adea21..7e49df4 100644
--- a/include/xs.h
+++ b/include/xs.h
@@ -200,6 +200,7 @@ XS_EXPORT int xs_setctxopt (void *context, int option, const void *optval,
#define XS_SNDTIMEO 28
#define XS_IPV4ONLY 31
#define XS_KEEPALIVE 32
+#define XS_PROTOCOL 33
/* Message options */
#define XS_MORE 1