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Re: make-network-process's gethostbyname usage

From: Jan Djärv
Subject: Re: make-network-process's gethostbyname usage
Date: Wed, 22 Aug 2007 13:32:08 +0200
User-agent: Thunderbird (X11/20070719)

Kim F. Storm skrev:
Richard Stallman <address@hidden> 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:

if test "X$HAVE_RES_INIT" = X; then
  AC_SEARCH_LIBS(res_init, resolv, HAVE_RES_INIT=yes)

Untested :-)

        Jan D.

If that is in place, it should be trivial to add


before all calls to gethostbyname and getaddrinfo.

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