So - for fun I patched my local libzmq and changed the length check to not take the null terminator into account...
if (msg.size () == 5 && memcmp (msg.data (), "PAUSE", 5) == 0) ...and now I can send the PAUSE command using zstr_send - so this confirms my thought. Since the least disruptive change now that I understand what's going on is just to change my zproxy code to send the full char with terminator using zmsg rather than zstr, I'll do that - just following up to my question in case this information is useful to others. Brian On Sun, Dec 1, 2013 at 10:39 AM, Brian Knox <[email protected]> wrote: > Hello! > > I'm working on adding support for zmq_proxy_steerable commands to zproxy > in czmq. I noticed I was getting an invalid proxy command error when > trying to send a "PAUSE" command using zstr_send. > > Taking a look at the libzmq proxy.cpp code ~ line 117 on libzmq head ( > https://github.com/zeromq/libzmq/blob/master/src/proxy.cpp#L117) , I see: > > -------------------------------------------------- > if (msg.size () == 6 && memcmp (msg.data (), "PAUSE", 6) == 0) > state = paused; > ---------------------------------------------------- > > My understanding is that zstr_send (from czmq) does not send the NULL at > the end of the string, and zstr_recv adds one ( > https://github.com/zeromq/czmq/blob/master/src/zstr.c#L68 ) > > While I know libzmq is not czmq - I just want to make sure I understand > the libzmq code. Should I be sending "PAUSE" with a null terminator, and > is that why the command check in proxy.cpp is looking for a message size of > 6 rather than 5? > > Thanks! > Brian >
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