Add endpoint tuning of maxrcv size. Fix cmsg API.

The CMSG handling was completely borked.  This is fixed now, and
we stash the SP header size (ugh) in the CMSG contents to match what
nanomsg does.  We now pass the cmsg validation test.

We also fixed handling of certain endpoint-related options, so that
endpoints can get options from the socket at initialization time.
This required a minor change to the transport API for endpoints.

Finally, we fixed a critical fault in the REP handling of RAW sockets,
which caused them to always return NNG_ESTATE in all cases.  It should
now honor the actual socket option.

1 files changed, 35 insertions, 0 deletions

diff --git a/src/core/options.c b/src/core/options.c
index a0b74014..cd67e0d0 100644
--- a/src/core/options.c
+++ b/src/core/options.c
@@ -49,6 +49,27 @@ nni_setopt_int(int *ptr, const void *val, size_t size, int minval, int maxval)
 
 
 int
+nni_setopt_size(size_t *ptr, const void *val, size_t size, size_t minval,
+    size_t maxval)
+{
+	int v;
+
+	if (size != sizeof (v)) {
+		return (NNG_EINVAL);
+	}
+	memcpy(&v, val, sizeof (v));
+	if (v > maxval) {
+		return (NNG_EINVAL);
+	}
+	if (v < minval) {
+		return (NNG_EINVAL);
+	}
+	*ptr = v;
+	return (0);
+}
+
+
+int
 nni_getopt_duration(nni_duration *ptr, void *val, size_t *sizep)
 {
 	size_t sz = sizeof (*ptr);
@@ -77,6 +98,20 @@ nni_getopt_int(int *ptr, void *val, size_t *sizep)
 
 
 int
+nni_getopt_size(size_t *ptr, void *val, size_t *sizep)
+{
+	size_t sz = sizeof (*ptr);
+
+	if (sz > *sizep) {
+		sz = *sizep;
+	}
+	*sizep = sizeof (*ptr);
+	memcpy(val, ptr, sz);
+	return (0);
+}
+
+
+int
 nni_setopt_buf(nni_msgq *mq, const void *val, size_t sz)
 {
 	int len;