Define new NNG_ESTATE for dealing with protocol state errors.

This error code is set when a cooked mode protocol cannot support
an operation yet.  For example, it makes no sense to recv() a
reply on a REQ socket if no request has been sent yet.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/nng.h b/src/nng.h
index e22df1c6..335094c7 100644
--- a/src/nng.h
+++ b/src/nng.h
@@ -362,6 +362,7 @@ NNG_DECL int nng_device(nng_socket *, nng_socket *);
 #define NNG_EAGAIN		(-8)
 #define NNG_ENOTSUP		(-9)
 #define NNG_EADDRINUSE		(-10)
+#define NNG_ESTATE		(-11)
 
 // Maximum length of a socket address.  This includes the terminating NUL.
 // This limit is built into other implementations, so do not change it.