[zeromq-dev] assertion failed on zsocket_connect with ZMQ_REQ

[Pieter Hintjens]

Use 'puts ()' to print a string to the console.

On Tue, May 19, 2015 at 11:28 AM, Bachmair Florian - flexSolution GmbH
<florian.bachmair at flexsolution.eu> wrote:
> ok that was not (my only) problem.
> It is also during execution.
>
> How can I print the strerror?
>
> int rc = zsocket_connect(req, "%s", addr);
> zmq_strerror (zmq_errno ());
> assert(rc == 0);
>
> does not print anything for me
>
> Am 19.05.2015 um 11:23 schrieb Bachmair Florian - flexSolution GmbH:
>> like that?
>>
>> int rc = zsocket_connect(req, "%s", addr);
>> zmq_strerror (zmq_errno ());
>> assert(rc == 0);
>>
>> this does not work.
>>
>> But I think I found the problem.
>> I start both applications at the same time, so the socket may not yet be initialized by the oponent.
>>
>>
>>
>> Am 19.05.2015 um 10:22 schrieb Pieter Hintjens:
>>> The problem is that the endpoint is rejected by your operating system
>>> as "invalid" for some reason; possibly networking is switched off. You
>>> can print strerror (errno) or zmq_strerror (zmq_errno ()) to see the
>>> actual error message.
>>>
>>> On Tue, May 19, 2015 at 10:14 AM, Bachmair Florian - flexSolution GmbH
>>> <florian.bachmair at flexsolution.eu> wrote:
>>>> 'addr' is tcp://127.0.0.1:9998
>>>> so the problem may be that the other side of the socket has crashed?
>>>>
>>>> I see that I do not close the 'req' Socket, could this be a problem?
>>>>
>>>> Am 19.05.2015 um 09:59 schrieb Pieter Hintjens:
>>>>> zsocket_connect does not block. It returns -1 if the endpoint is
>>>>> invalid, which presumably it is. Could you tell us what the value of
>>>>> 'addr' is ?
>>>>>
>>>>> On Tue, May 19, 2015 at 9:40 AM, Bachmair Florian - flexSolution GmbH
>>>>> <florian.bachmair at flexsolution.eu> wrote:
>>>>>> hi!
>>>>>>
>>>>>> Sometimes I get an assertion failed in my code.
>>>>>> Why is this? shouldn't it block, till a connection is established?
>>>>>>
>>>>>>
>>>>>>
>>>>>> NIEXPORT jstring JNICALL Java_eu_flexsolution_core_JNI_1zeromq_request(
>>>>>>            JNIEnv *env, jobject object, jstring address, jstring timestamp,
>>>>>>            jstring format, jstring command, jstring message) {
>>>>>>        const char* addr = (*env)->GetStringUTFChars(env, address, 0);
>>>>>>        const char* ts = (*env)->GetStringUTFChars(env, timestamp, 0);
>>>>>>        const char* f = (*env)->GetStringUTFChars(env, format, 0);
>>>>>>        const char* cmd = (*env)->GetStringUTFChars(env, command, 0);
>>>>>>        const char* msg = (*env)->GetStringUTFChars(env, message, 0);
>>>>>>
>>>>>>        printf("REQ:%s:%s:%s:%s:%s\n", addr,cmd, msg, f, ts);
>>>>>>        fflush(stdout);
>>>>>>        void *req = zsocket_new(context, ZMQ_REQ);
>>>>>>        int rc = zsocket_connect(req, "%s", addr);
>>>>>>        assert(rc == 0);
>>>>>>        s_sendmore(req, ts);
>>>>>>        s_sendmore(req, f);
>>>>>>        s_sendmore(req, cmd);
>>>>>>        s_send(req, msg);
>>>>>>
>>>>>>        char* reply = s_recv(req);
>>>>>>        printf("reply: %s\n", reply);
>>>>>>        fflush(stdout);
>>>>>>
>>>>>>        (*env)->ReleaseStringUTFChars(env, timestamp, ts);
>>>>>>        (*env)->ReleaseStringUTFChars(env, format, f);
>>>>>>        (*env)->ReleaseStringUTFChars(env, message, msg);
>>>>>>
>>>>>>        jstring ret = (*env)->NewStringUTF(env, reply);
>>>>>>        return ret;
>>>>>> }
>>>>>>
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