Date: Mon, 19 Jan 1998 20:47:05 +0000 From: Brian Somers <brian@Awfulhak.org> To: freebsd-hackers@FreeBSD.ORG Cc: Charles Mott <cmott@srv.net>, Eivind Eklund <perhaps@yes.no> Subject: Recent libalias/ppp crashes. dlsym() bug ? Message-ID: <199801192047.UAA21903@awfulhak.org>
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Well, people may be pleased to know that I found the problem that's
been making ppp ``evaporate'' recently.
The new PunchFWHole() function in libalias is called from alias_db.c,
alias_ftp.c and alias_irc.c. I didn't get things right, and adjusted my
script that builds my ppp archive so that it #ifdefs things out...
(based on __FreeBSD_version) missing the PunchFWHole() call in
alias_ftp.c and alias_irc.c, but managing to remove its definition from
alias_db.c.
When loading libalias, ppp uses dlopen()/dlsym() (in loadalias.c).
It successfully loads the libalias stuff, and the PunchFWHole() call
in alias_ftp.c makes the whole program evaporate - no syslog, nothing.
This begs the question: Why can I load a function with dlsym() that
has unresolved variables in it ? I'm afraid I haven't been paying
attention to the dladdr() thread - if it's relevant.
Thanks for any advise.
Oh, and BTW, ppp is now fixed :-)
--
Brian <brian@Awfulhak.org>, <brian@FreeBSD.org>, <brian@OpenBSD.org>
<http://www.Awfulhak.org>;
Don't _EVER_ lose your sense of humour....
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