From: "Jan Djärv" <jan.h.d@swipnet.se>
To: "Kim F. Storm" <storm@cua.dk>
Cc: rms@gnu.org, emacs-devel@gnu.org
Subject: Re: make-network-process's gethostbyname usage
Date: Wed, 22 Aug 2007 13:32:08 +0200 [thread overview]
Message-ID: <46CC1EB8.6030404@swipnet.se> (raw)
In-Reply-To: <87veb8orkl.fsf@kfs-lx.testafd.dk>
Kim F. Storm skrev:
> Richard Stallman <rms@gnu.org> writes:
>
>> make-network-process calles gethostbyname, but never calls
>> res_init. The problem, which appears is: if contents of
>> /etc/resolv.conf was changed old dns servers are unavailable,
>> gethostbyname still tries them, not new ones. So this bug is pretty
>> much the same as http://bugs.debian.org/438680 (which has a patch).
>>
>> Would someone please DTRT about this, then ack?
>> It needs to be fixed in Emacs 22.
>
> I don't know what to do about this.
>
> configure already has a check for res_init, but on my system (GNU/Linux),
> HAVE_RES_INIT is undefined, indicating that it doesn't exist.
>
> However, I believe that it does exist, but only if -lresolv is specified.
>
> So how can we fix configure to DTRT?
>
> a) Include -lresolv in the check for HAVE_RES_INIT.
>
> b) Include -lresolv in LIBS if and only if HAVE_RES_INIT is defined.
>
>
Should we not first try if res_init exists without any special libraries, and
if that fails, check for -lresolv and try to find res_init again?
But there seems to be some problem with that, comment in configure.in says:
dnl This causes -lresolv to get used in subsequent tests,
dnl which causes failures on some systems such as HPUX 9.
dnl AC_CHECK_LIB(resolv, gethostbyname)
But otherwise:
AC_CHECK_FUNCS(res_init)
if test "X$HAVE_RES_INIT" = X; then
AC_SEARCH_LIBS(res_init, resolv, HAVE_RES_INIT=yes)
fi
Untested :-)
Jan D.
> If that is in place, it should be trivial to add
>
> #if HAVE_RES_INIT
> res_init();
> #endif
>
> before all calls to gethostbyname and getaddrinfo.
>
>
next prev parent reply other threads:[~2007-08-22 11:32 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-20 8:56 make-network-process's gethostbyname usage Alexander Kotelnikov
2007-08-21 8:43 ` Kim F. Storm
2007-08-21 9:51 ` Alexander Kotelnikov
2007-08-21 14:46 ` Richard Stallman
2007-08-22 9:18 ` Kim F. Storm
2007-08-22 11:32 ` Jan Djärv [this message]
2007-08-23 0:45 ` Richard Stallman
2007-08-25 19:06 ` Chong Yidong
2007-08-27 11:09 ` Jan Djärv
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