URL:
<http://gna.org/bugs/?20476>
Summary: netdb.h conflict
Project: Freeciv
Submitted by: hugo
Submitted on: Sun 03 Feb 2013 01:04:36 PM GMT
Category: general
Severity: 2 - Minor
Priority: 5 - Normal
Status: None
Assigned to: None
Originator Email:
Open/Closed: Open
Release:
Discussion Lock: Any
Operating System: GNU/Linux
Planned Release:
_______________________________________________________
Details:
After building against SVN @22265 on Ubuntu Ubuntu 10.04.4 LTS ("Lucid"),
attempting to start the server immediately bailed out with the error "Server:
bad address: <(none):5556>."
After some digging, this turned out to be a conflict between two different
netdb.h files - /usr/include/netdb.h comes from libc6 (Ubuntu package libc-dev
version 2.11.1-0ubuntu7.11 from the eglibc project), and includes a
definition:
# define AI_NUMERICSERV 0x0400 /* Don't use name resolution. */
I also have /usr/include/bind/netdb.h, which comes from libbind (Ubuntu
package libbind4, version 6.0-1, from the libbind project). This is the
library that actually provides getaddrinfo(3), and does *not* define or
support NUMERICSERV; attempting to pass ai_flags with 0x400 set always returns
EAI_BADFLAGS.
I don't know whether the error here is mine, Ubuntu's, Freeciv's, or that of
one of the two source projects.
1) It was made harder to track down the problem because net_lookup_getaddrinfo
in utility/netintf.c does not report or return the actual error. It would be
useful if it could be modified to log the error, eg with:
... else {
printf("getaddrinfo: error '%s' (%d)\n", gai_strerror(err), err);
}
2) I do not know if the configure probes could be enhanced to check for both
<netdb.h> and <bind/netdb.h> and make an intelligent choice between them. For
now I've just hacked my netintf.c, which has got me a little further; I've not
yet checked if I also need to change the other uses of netdb.h.
3) An alternative would be to support a build hint HAVE_AI_NUMERICSERV, but I
suspect it will generally be hard for someone building freeciv to discover
they should override this to false.
Hope this helps,
Hugo
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