[Bug 153571] Re: getaddrinfo manpage doesn't match glibc implementation when hints is NULL
In upstream GLIBC there are two flags in the defaults: AI_ADDRCONFIG: It is most probably *not* a good default, as it's only useful for applications that have to set the hints anyway so that they only recieve TCP or UDP addrinfo structures, not both. http://sourceware.org/bugzilla/show_bug.cgi?id=14965 AI_V4MAPPED: This is not used, as it only applies to AF_INET6 but the default is AF_UNSPEC. http://sourceware.org/bugzilla/show_bug.cgi?id=14415 Therefore the only sane default is probably no flags at all (hints.ai_flags = 0). ** Bug watch added: Sourceware.org Bugzilla #14965 http://sourceware.org/bugzilla/show_bug.cgi?id=14965 ** Bug watch added: Sourceware.org Bugzilla #14415 http://sourceware.org/bugzilla/show_bug.cgi?id=14415 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/153571 Title: getaddrinfo manpage doesn't match glibc implementation when hints is NULL To manage notifications about this bug go to: https://bugs.launchpad.net/glibc/+bug/153571/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 153571] Re: getaddrinfo manpage doesn't match glibc implementation when hints is NULL
Launchpad has imported 4 comments from the remote bug at http://sourceware.org/bugzilla/show_bug.cgi?id=10567. If you reply to an imported comment from within Launchpad, your comment will be sent to the remote bug automatically. Read more about Launchpad's inter-bugtracker facilities at https://help.launchpad.net/InterBugTracking. On 2009-08-27T10:07:13+00:00 Michael Kerrisk wrote: POSIX.1-2001 and 2008 say that if the hints argument of getaddrinfo() is NULL, then the behavior shall be as if it referred to a structure containing the value zero for the ai_flags, ai_socktype, and ai_protocol fields, and AF_UNSPEC for the ai_family field. However, glibc defines ai_flags as AI_V4MAPPED | AI_ADDRCONFIG for this case. Is this deviation from POSIX.1 intentional? Should it be fixed? Reply at: https://bugs.launchpad.net/glibc/+bug/153571/comments/4 On 2009-08-31T12:14:51+00:00 Drepper-fsp wrote: (In reply to comment #0) Should it be fixed? No. Like several other things in the getaddrinfo spec this is non-optimal at best. The defaults used in glibc are much better. Reply at: https://bugs.launchpad.net/glibc/+bug/153571/comments/9 On 2009-09-03T04:15:22+00:00 Mtk-manpages-googlemail wrote: Subject: Re: getaddrinfo() hints==NULL (ai_flags) deviates from POSIX.1 On Mon, Aug 31, 2009 at 2:14 PM, drepper at redhat dot comsourceware-bugzi...@sourceware.org wrote: --- Additional Comments From drepper at redhat dot com 2009-08-31 12:14 --- (In reply to comment #0) Should it be fixed? No. Like several other things in the getaddrinfo spec this is non-optimal at best. The defaults used in glibc are much better. Thanks. I'll update the man page to make it clear that this choice is deliberate. Reply at: https://bugs.launchpad.net/glibc/+bug/153571/comments/10 On 2009-10-09T22:08:26+00:00 Paul Fee wrote: Can some details be added as to why the glibc defaults are better than the POSIX standard. The default only applies if hints==NULL. If the POSIX defaults are non-optimal, then users of other systems (e.g. Solaris) would find it useful to know that different settings are preferred. On Solaris 10, setting hints to NULL results in POSIX defined behaviour. Are the reasons behind glibc's defaults unique to glibc or are they related to network effects which would apply to any OS or C resolver library. If the settings are valid everywhere then getaddrinfo() users would benefit from using them on non-glibc platforms. Thanks. Reply at: https://bugs.launchpad.net/glibc/+bug/153571/comments/11 ** Changed in: glibc Importance: Unknown = Medium -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/153571 Title: getaddrinfo manpage doesn't match glibc implementation when hints is NULL -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 153571] Re: getaddrinfo manpage doesn't match glibc implementation when hints is NULL
** Changed in: glibc Status: Unknown = Won't Fix -- getaddrinfo manpage doesn't match glibc implementation when hints is NULL https://bugs.launchpad.net/bugs/153571 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 153571] Re: getaddrinfo manpage doesn't match glibc implementation when hints is NULL
Michael Kerrisk has indicated the manpages will be updated. Please add detail about the rational for the difference between glibc and POSIX, if you have this information. ** Changed in: manpages Status: New = In Progress ** Changed in: manpages Assignee: (unassigned) = Michael Kerrisk (mtk-manpages) ** Changed in: glibc (Ubuntu) Assignee: (unassigned) = Paul Fee (pfee) -- getaddrinfo manpage doesn't match glibc implementation when hints is NULL https://bugs.launchpad.net/bugs/153571 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 153571] Re: getaddrinfo manpage doesn't match glibc implementation when hints is NULL
Ulrich Drepper has responded to say that choice of defaults is deliberate. Therefore the behaviour in glibc won't be changing. Next task is to get the getaddrinfo manpage updated to state why there's a discrepancy between the glibc implementation and the POSIX standard. ** Also affects: glibc via http://sourceware.org/bugzilla/show_bug.cgi?id=10567 Importance: Unknown Status: Unknown ** Also affects: manpages Importance: Undecided Status: New ** Changed in: glibc (Ubuntu) Status: In Progress = Invalid -- getaddrinfo manpage doesn't match glibc implementation when hints is NULL https://bugs.launchpad.net/bugs/153571 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 153571] Re: getaddrinfo manpage doesn't match glibc implementation when hints is NULL
Note that the reporter is marking a bug against the POSIX man page which is taken straight from the standard. By definition, this page won't describe glibc specifics. I confirm that the reporter is correct in pointing out that glibc deviates from the standard. (I don't know the reasons) The Linux man page documents the deviation: http://www.kernel.org/doc/man-pages/online/pages/man3/getaddrinfo.3.html -- getaddrinfo manpage doesn't match glibc implementation when hints is NULL https://bugs.launchpad.net/bugs/153571 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 153571] Re: getaddrinfo manpage doesn't match glibc implementation when hints is NULL
For what it's worth, I filed this glibc bug: http://sourceware.org/bugzilla/show_bug.cgi?id=10567 ** Bug watch added: Sourceware.org Bugzilla #10567 http://sourceware.org/bugzilla/show_bug.cgi?id=10567 -- getaddrinfo manpage doesn't match glibc implementation when hints is NULL https://bugs.launchpad.net/bugs/153571 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 153571] Re: getaddrinfo manpage doesn't match glibc implementation when hints is NULL
Thanks for the update. The getaddrinfo manpage on Ubuntu 9.04 has text. Specifying hints as NULL is equivalent to setting ai_socktype and ai_protocol to 0; ai_family to AF_UNSPEC; and ai_flags to (AI_V4MAPPED | AI_ADDRCONFIG). I notice there are two getaddrinfo manpages, section 3 and 3posix. I didn't spotted that before. The section 3 manpage correctly documents the glibc implementation. So I the manpage part of this bug is fixed (or wasn't a bug to start with). Thanks for raising the glibc bug, it'll be interesting to see the reasoning behind the deviation from the POSIX standard. -- getaddrinfo manpage doesn't match glibc implementation when hints is NULL https://bugs.launchpad.net/bugs/153571 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 153571] Re: getaddrinfo manpage doesn't match glibc implementation when hints is NULL
Posix manpage describes the standard, not the glibc implementation. ** Changed in: manpages-posix (Ubuntu) Status: New = Invalid ** Changed in: manpages-posix (Ubuntu) Assignee: (unassigned) = Paul Fee (pfee) -- getaddrinfo manpage doesn't match glibc implementation when hints is NULL https://bugs.launchpad.net/bugs/153571 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 153571] Re: getaddrinfo manpage doesn't match glibc implementation when hints is NULL
Awaiting feedback from upstream. http://sourceware.org/bugzilla/show_bug.cgi?id=10567 ** Changed in: glibc (Ubuntu) Status: Incomplete = In Progress -- getaddrinfo manpage doesn't match glibc implementation when hints is NULL https://bugs.launchpad.net/bugs/153571 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 153571] Re: getaddrinfo manpage doesn't match glibc implementation when hints is NULL
Hello Matthias, I downloaded Hardy's libc6-dev source package (2.7-10ubuntu3), same extraction steps as above (except 2.7 instead of 2.5). Also checked getaddrinfo manpage (in manpages-posix-dev, 2.16-1). In the glibc source code: ./include/netdb.h:#define AI_DEFAULT(AI_V4MAPPED | AI_ADDRCONFIG The manpage has the text: If hints is a null pointer, the behavior shall be as if it referred to a structure containing the value zero for the ai_flags, ai_socktype, and ai_protocol fields, and AF_UNSPEC for the ai_family field. Since neither glibc nor the manpage has changed, the bug remains unresolved. Thanks, Paul -- getaddrinfo manpage doesn't match glibc implementation when hints is NULL https://bugs.launchpad.net/bugs/153571 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 153571] Re: getaddrinfo manpage doesn't match glibc implementation when hints is NULL
please could you recheck with hardy and/or intrepid? ** Changed in: glibc (Ubuntu) Status: New = Incomplete -- getaddrinfo manpage doesn't match glibc implementation when hints is NULL https://bugs.launchpad.net/bugs/153571 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 153571] Re: getaddrinfo manpage doesn't match glibc implementation when hints is NULL
** Also affects: glibc (Ubuntu) Importance: Undecided Status: New -- getaddrinfo manpage doesn't match glibc implementation when hints is NULL https://bugs.launchpad.net/bugs/153571 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
