Whoops.. forgot to attach the code (modified example from
http://en.wikipedia.org/wiki/Getaddrinfo). Also, this produces:
AF_INET family integer is: 2
AF_INET6 family integer is: 10
family for result was 2
hostname: localhost
family for result was 2
hostname: localhost
family for result was 2
hostname: localhost
family for result was 2
hostname: localhost
family for result was 2
hostname: localhost
family for result was 2
hostname: localhost
on my Ubuntu 9.10 machine.
- Eric
On Mon, May 10, 2010 at 7:00 PM, Eric Perko <
wisesage5001@gmail.com> wrote:
> Alexis,
>
> What version of ROS and Ubuntu are you running?
>
> Also, could you try compiling and running the attached code? It uses a
> similar call to the place that generates that error regarding finding
> AF_INET addresses (comes from rosed xmlrpcpp XmlRpcSocket.cpp). I'm
> wondering what network addresses you actually have if you don't have
> AF_INET addresses for localhost when disconnected from the network...
>
> - Eric
>
> On Mon, May 10, 2010 at 6:34 PM, Ken Conley <kwc@willowgarage.com> wrote:
>> Hi Alexis,
>>
>> Personally, I'm stumped. This doesn't appear to be just a ROS network
>> configuration issue. For some reason, your machine appears to be unable to
>> resolve localhost, which should work even when you're not connected. I'm not
>> aware of any reason why your ROS should work when you are plugged in versus
>> unplugged, if in both cases you are using 'localhost'. Is it the case that
>> you can ping localhost even when you're not connected?
>>
>> - Ken
>>
>> On Mon, May 10, 2010 at 3:20 PM, Alexis Cheng <acheng_1221@hotmail.com>
>> wrote:
>>>
>>> Hi Ken,
>>>
>>>
>>>
>>> I changed ROS_IP to 127.0.0.1, but the problem is persisting. Are there
>>> any steps/procedures to ensure the proper network configuration for
>>> ROS besides those outlined in the wiki?
>>>
>>>
>>>
>>> Thanks!
>>>
>>>
>>>
>>> Alexis Cheng
>>>
>>> Electrical Engineering
>>>
>>> University of British Columbia
>>>
>>>
>>> Hi Alexis,
>>>
>>> For some reason 'localhost' isn't resolving on your machine. I would
>>> recommend trying using
>>>
>>> ROS_IP=127.0.0.1
>>>
>>> instead of ROS_HOSTNAME=localhost. NOTE: this will disable your ability to
>>> connect to remote machines with ROS.
>>>
>>> - Ken
>>>
>>>
>>> On Mon, May 10, 2010 at 3:09 PM, Alexis Cheng <acheng_1221@hotmail.com>
>>> wrote:
>>>>
>>>> Hi all,
>>>>
>>>> I have installed ROS on a single Ubuntu machine and it seems to be
>>>> working while connected to the internet. However, roscore is unable to run
>>>> without internet connection. Roswtf does not return any errors or warnings.
>>>>
>>>> -----
>>>>
>>>> Roscore responds with:
>>>>
>>>> [ERROR] 1273528178.429037000: [registerService] Failed to contact master
>>>> at [localhost:11311]. Retrying...
>>>>
>>>> Rosrun responds with:
>>>>
>>>> Couldn't find an AF_INET address for [localhost]
>>>> [ERROR] 1273528740.753778000: [registerPublisher] Failed to contact
>>>> master at [localhost:11311]. Retrying...
>>>>
>>>> -----
>>>>
>>>> I have went through the network setup document on ROS wiki and it seems
>>>> to pass the tests. I have also changed ROS_HOSTNAME to localhost.
>>>>
>>>> Has anyone encountered this problem before and managed to correct it?
>>>>
>>>> Thanks!
>>>>
>>>> Alexis Cheng
>>>> Electrical Engineering
>>>> University of British Columbia
>>>>
>>>>
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>>
>>
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>>
>>
>
#include <stdio.h>
#include <stdlib.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>
#ifndef NI_MAXHOST
#define NI_MAXHOST 1025
#endif
int main(void)
{
struct addrinfo * result;
struct addrinfo * res;
int error;
/* resolve the domain name into a list of addresses */
error = getaddrinfo("localhost", NULL, NULL, &result);
if (error != 0)
{
fprintf(stderr, "error in getaddrinfo: %s\n", gai_strerror(error));
return 1;
}
printf("AF_INET family integer is: %d\nAF_INET6 family integer is: %d\n", AF_INET, AF_INET6);
/* loop over all returned results and do inverse lookup */
for (res = result; res != NULL; res = res->ai_next)
{
char hostname[NI_MAXHOST] = "";
error = getnameinfo(res->ai_addr, res->ai_addrlen, hostname, NI_MAXHOST, NULL, 0, 0);
printf("family for result was %d\n", res->ai_family);
if (error != 0)
{
fprintf(stderr, "error in getnameinfo: %s\n", gai_strerror(error));
continue;
}
if (*hostname)
{
printf("hostname: %s\n", hostname);
}
}
freeaddrinfo(result);
return 0;
}
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