nuts: try to avoid address in use for most tests

We get test failures somewhat frequently due to port conflicts.
This attempts to make more of the tests use the trick of binding
to port 0, and letting us use the random port instead.

1 files changed, 12 insertions, 0 deletions

diff --git a/src/testing/nuts.h b/src/testing/nuts.h
index 5fe193db..f2e50c2c 100644
--- a/src/testing/nuts.h
+++ b/src/testing/nuts.h
@@ -85,6 +85,10 @@ extern uint16_t nuts_next_port(void);
 // 64 bytes to ensure no truncation occurs.
 extern void nuts_scratch_addr(const char *, size_t, char *);
 
+// like nuts_scratch_addr, but attempts to use an autobind (0 port)
+// address instead.
+extern void nuts_scratch_addr_zero(const char *, size_t, char *);
+
 // nuts_marry connects two sockets using inproc.  It uses socket
 // pipe hooks to ensure that it does not return before both sockets
 // are fully connected.
@@ -264,6 +268,14 @@ extern const char *nuts_ecdsa_client_crt;
 		(var) = nuts_addr_;                                        \
 	} while (0)
 
+#define NUTS_ADDR_ZERO(var, scheme)                          \
+	do {                                                 \
+		static char nuts_addr_[64];                  \
+		nuts_scratch_addr_zero(                      \
+		    scheme, sizeof(nuts_addr_), nuts_addr_); \
+		(var) = nuts_addr_;                          \
+	} while (0)
+
 #define NUTS_OPEN(sock) NUTS_PASS(nng_pair1_open(&(sock)))
 
 #define NUTS_CLOSE(sock) NUTS_PASS(nng_close(sock))