Implement protocol versioning (except PGM)

Implements SP protocol versioning, legacy protocol support, and the
following pattern protocol versions:

PAIR:     v2
PUBSUB:   v1 (legacy), v3
REQREP:   v1
PIPELINE: v2
SURVEY:   v1

Engine support is only for stream_engine_t at this stage.

Signed-off-by: Martin Lucina <martin@lucina.net>

1 files changed, 33 insertions, 0 deletions

diff --git a/src/pair.cpp b/src/pair.cpp
index b4cb0b4..d4f699e 100644
--- a/src/pair.cpp
+++ b/src/pair.cpp
@@ -23,12 +23,17 @@
 #include "err.hpp"
 #include "pipe.hpp"
 #include "msg.hpp"
+#include "wire.hpp"
 
 xs::pair_t::pair_t (class ctx_t *parent_, uint32_t tid_, int sid_) :
     socket_base_t (parent_, tid_, sid_),
     pipe (NULL)
 {
     options.type = XS_PAIR;
+    options.sp_pattern = SP_PAIR;
+    options.sp_role = SP_PAIR_PAIR;
+    options.sp_version = 2;
+    options.sp_complement = SP_PAIR_PAIR;
 }
 
 xs::pair_t::~pair_t ()
@@ -36,6 +41,34 @@ xs::pair_t::~pair_t ()
     xs_assert (!pipe);
 }
 
+int xs::pair_t::xsetsockopt (int option_, const void *optval_,
+    size_t optvallen_)
+{
+    if (option_ != XS_PROTOCOL) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    if (optvallen_ != sizeof (int)) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    if (!optval_) {
+        errno = EFAULT;
+        return -1;
+    }
+
+    int version = *(int *) optval_;
+    if (version != 2) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    options.sp_version = version;
+    return 0;
+}
+
 void xs::pair_t::xattach_pipe (pipe_t *pipe_, bool icanhasall_)
 {
     xs_assert (!pipe);