Why am I segfault'ing when replacing poll () with zmq_poll () in the main glib context?

I'm trying to integrate zeromq into the main glib loop, but I can't figure out why my program is segfault'ing.

Here's a function to guarantee a segfault after running g_main_loop_run (loop):

/** set poll fn to operate on zmq or unix sockets */
g_main_context_set_poll_func( g_context, (GPollFunc) zmq_poll );

      

        
        
        
      

    

I thought it would work, given that it zmq_poll

shares the same structure as poll

calling this same function with s / zmq_poll / poll / works fine.

The split version of my code is still segfault'ing with it: http://paste.pocoo.org/show/568289/ .

(untested) Full version: http://paste.pocoo.org/show/568292/ .

StackTrace:

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff6a2bd50 in ?? ()
   from /usr/lib/libzmq.so.1
(gdb) bt
#0  0x00007ffff6a2bd50 in ?? ()
   from /usr/lib/libzmq.so.1
#1  0x00007ffff6a34b4d in zmq_getsockopt ()
   from /usr/lib/libzmq.so.1
#2  0x00007ffff6a34e1b in zmq_poll ()
   from /usr/lib/libzmq.so.1
#3  0x00007ffff6c89dc8 in ?? ()
   from /usr/lib/libglib-2.0.so.0
#4  0x00007ffff6c8a5f2 in g_main_loop_run ()
  from /usr/lib/libglib-2.0.so.0
#5  0x0000000000402978 in main (argc=1, 
argv=0x7fffffffe5e8) at server.c:229

      

        
        
        
      

    

Compile the code (if you have gstreamer and zeromq installed):

gcc --debug `pkg-config gstreamer-0.10 --libs` -lzmq `pkg-config gstreamer-0.10 --cflags` -o test test.c

      

        
        
        
      

    

What am I doing wrong?

Any help is appreciated, thanks.

EDIT: Worked with what Alexander suggested, using this function as a replacement for my survey:

gint zmq_poll_adapter(GPollFD *ufds, guint nfsd, gint timeout_)
{
    zmq_pollitem_t ufds0[nfsd];
    int i;
    for (i = 0; i < nfsd; i++)
    {
        ufds0[i].socket = NULL;
        ufds0[i].fd = ufds[i].fd;
        ufds0[i].events = ufds[i].events;
        ufds0[i].revents = ufds[i].revents;
    }
    zmq_poll(ufds0, nfsd, timeout_);
}

      

        
        
        
      

    

To be honest, I'm not even sure how it worked as well as it did, but I'm new to C and don't know how to do more responsive adaptation ().