Add void* arguments to request_new and reply_new evrpc hooks

This makes evprc setup more extensible, and helps with Shuo Chen's
work on implementing Google protocol buffers rpc on top of Libevent 2
evrpc.

This patch breaks binary compatibility with previous versions of
Libevent, since it changes struct evrpc and the signature of
evrpc_register_generic().  Since all compliant code should be calling
evrpc_register_generic via EVRPC_REGISTER, it shouldn't break source
compatibility.

(Code by Shuo Chen; commit message by Nick)

1 files changed, 7 insertions, 0 deletions

diff --git a/event_rpcgen.py b/event_rpcgen.py
index f8d14d62..9eb75762 100755
--- a/event_rpcgen.py
+++ b/event_rpcgen.py
@@ -117,6 +117,7 @@ class StructCCode(Struct):
 
         print >>file, \
 """struct %(name)s *%(name)s_new(void);
+struct %(name)s *%(name)s_new_with_arg(void *);
 void %(name)s_free(struct %(name)s *);
 void %(name)s_clear(struct %(name)s *);
 void %(name)s_marshal(struct evbuffer *, const struct %(name)s *);
@@ -157,6 +158,12 @@ int evtag_unmarshal_%(name)s(struct evbuffer *, ev_uint32_t,
             'struct %(name)s *\n'
             '%(name)s_new(void)\n'
             '{\n'
+            '  return %(name)s_new_with_arg(NULL);\n'
+            '}\n'
+            '\n'
+            'struct %(name)s *\n'
+            '%(name)s_new_with_arg(void *unused)\n'
+            '{\n'
             '  struct %(name)s *tmp;\n'
             '  if ((tmp = malloc(sizeof(struct %(name)s))) == NULL) {\n'
             '    event_warn("%%s: malloc", __func__);\n'