[zeromq-dev] C examples do not work on my PC, either with ipc or tcp, except ipc with server & client executed in the same console

Laurent Alebarde l.alebarde at free.fr
Wed Jun 26 15:06:40 CEST 2013


Hi list,

I cannot manage to have my code working. It seems that I am sticked in 
zmq_poll. Even in an infinite while, a printf and a 100 ms time-out, the 
printf executes only once, so I conclude that in my code, zmq_poll 
blocks internally.

So I have tried the examples - precisely flclient1 along with flserver1 
- starting the server first of course. I have tried with ipc and tcp and 
it does not work, probably for the same reasons, except with ipc in the 
same console :

console server :
$ ./flserver1 ipc://test.ipc &
[1] 17822
$ I: echo service is ready at ipc://test.ipc

console client :
$ ./flclient1 ipc://test.ipc
I: trying echo service at ipc://test.ipc...
W: no response from ipc://test.ipc, retrying...
I: trying echo service at ipc://test.ipc...
W: no response from ipc://test.ipc, retrying...
I: trying echo service at ipc://test.ipc...
W: no response from ipc://test.ipc, retrying...


In the same console, it works :
$ ./flserver1 ipc://test.ipc &
[2] 17800
[1]   Fini                    ./flserver1 ipc://test.ipc
$ I: echo service is ready at ipc://test.ipc

$ ../../flclient1/Release/flclient1 ipc://test.ipcI: trying echo service 
at ipc://test.ipc...
Service is running OK

With tcp, it does not work either in the same console or not :
$ ./flserver1 tcp://localhost:5555&
[1] 17841
$ I: echo service is ready at tcp://localhost:5555

$ ../../flclient1/Release/flclient1 tcp://localhost:5555
I: trying echo service at tcp://localhost:5555...
W: no response from tcp://localhost:5555, retrying...
I: trying echo service at tcp://localhost:5555...
W: no response from tcp://localhost:5555, retrying...
I: trying echo service at tcp://localhost:5555...
W: no response from tcp://localhost:5555, retrying...

My iptables authorises inputs on localhost  (if I am not wrong):

# iptables -L -n
Chain INPUT (policy DROP)
target     prot opt source               destination
ACCEPT     udp  --  127.0.0.0/24         0.0.0.0/0            udp dpt:80
ACCEPT     tcp  --  127.0.0.0/24         0.0.0.0/0            tcp dpt:80
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0 state RELATED,ESTABLISHED
REJECT     tcp  --  0.0.0.0/0            0.0.0.0/0 reject-with tcp-reset
REJECT     udp  --  0.0.0.0/0            0.0.0.0/0 reject-with 
icmp-port-unreachable
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0
ACCEPT     icmp --  0.0.0.0/0            0.0.0.0/0 icmptype 0
ACCEPT     udp  --  192.168.0.0/24       0.0.0.0/0            udp dpt:631
ACCEPT     tcp  --  192.168.0.0/24       0.0.0.0/0            tcp dpt:631

Chain FORWARD (policy DROP)
target     prot opt source               destination
ACCEPT     all  --  192.168.99.0/24     !192.168.0.0/24
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0 state RELATED,ESTABLISHED

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination


Here are for information the compile command (from Eclipse) :
Command : g++-4.7.3
Options :  -O3 -Wall -c -fmessage-length=0  -std=c++11 -march=corei7 
-mtune=corei7

and for the linker :
Command : g++-4.7.3
Options :  -l czmq


Any idea please ?
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