fixes #143 Protocols and transports should be "configurable"

This makes all the protocols and transports optional.  All
of them except ZeroTier are enabled by default, but you can
now disable them (remove from the build) with cmake options.

The test suite is modified so that tests still run as much
as they can, but skip over things caused by missing functionality
from the library (due to configuration).

Further, the constant definitions and prototypes for functions
that are specific to transports or protocols are moved into
appropriate headers, which should be included directly by
applications wishing to use these.

We have also added and improved documentation -- all of the
transports are documented, and several more man pages for
protocols have been added.  (Req/Rep and Surveyor are still
missing.)

1 files changed, 33 insertions, 3 deletions

diff --git a/src/nng_compat.c b/src/nng_compat.c
index f8a7ceb0..482834a1 100644
--- a/src/nng_compat.c
+++ b/src/nng_compat.c
@@ -10,6 +10,16 @@
 
 #include "nng_compat.h"
 #include "nng.h"
+#include "protocol/bus0/bus.h"
+#include "protocol/pair0/pair.h"
+#include "protocol/pipeline0/pull.h"
+#include "protocol/pipeline0/push.h"
+#include "protocol/pubsub0/pub.h"
+#include "protocol/pubsub0/sub.h"
+#include "protocol/reqrep0/rep.h"
+#include "protocol/reqrep0/req.h"
+#include "protocol/survey0/respond.h"
+#include "protocol/survey0/survey.h"
 
 #include <stdio.h>
 #include <string.h>
@@ -92,17 +102,37 @@ static const struct {
 	uint16_t p_id;
 	int (*p_open)(nng_socket *);
 } nn_protocols[] = {
-	// clang-format off
+// clang-format off
+#ifdef NNG_HAVE_BUS0
 	{ NN_BUS, nng_bus0_open },
+#endif
+#ifdef NNG_HAVE_PAIR0
 	{ NN_PAIR, nng_pair0_open },
+#endif
+#ifdef NNG_HAVE_PUSH0
 	{ NN_PUSH, nng_push0_open },
+#endif
+#ifdef NNG_HAVE_PULL0
 	{ NN_PULL, nng_pull0_open },
+#endif
+#ifdef NNG_HAVE_PUB0
 	{ NN_PUB, nng_pub0_open },
+#endif
+#ifdef NNG_HAVE_SUB0
 	{ NN_SUB, nng_sub0_open },
+#endif
+#ifdef NNG_HAVE_REQ0
 	{ NN_REQ, nng_req0_open },
+#endif
+#ifdef NNG_HAVE_REP0
 	{ NN_REP, nng_rep0_open },
+#endif
+#ifdef NNG_HAVE_SURVEYOR0
 	{ NN_SURVEYOR, nng_surveyor0_open },
+#endif
+#ifdef NNG_HAVE_RESPONDENT0
 	{ NN_RESPONDENT, nng_respondent0_open },
+#endif
 	{ 0, NULL },
 	// clang-format on
 };
@@ -115,7 +145,7 @@ nn_socket(int domain, int protocol)
 	int        i;
 
 	if ((domain != AF_SP) && (domain != AF_SP_RAW)) {
-		nn_seterror(EAFNOSUPPORT);
+		errno = EAFNOSUPPORT;
 		return (-1);
 	}
 
@@ -125,7 +155,7 @@ nn_socket(int domain, int protocol)
 		}
 	}
 	if (nn_protocols[i].p_open == NULL) {
-		nn_seterror(ENOTSUP);
+		errno = ENOTSUP;
 		return (-1);
 	}