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Date: Tue, 22 Jun 2004 18:44:11 +0300
From: Ruslan Ermilov <ru@freebsd.org>
To: ngl <ngl@ur.ru>
Message-ID: <20040622154411.GA47418@ip.net.ua>
References: <047b01c4584d$262017a0$8501a8c0@spirit>
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cc: freebsd-standards@freebsd.org
Subject: Re: EXPORT_SYMS
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On Tue, Jun 22, 2004 at 05:36:23PM +0600, ngl wrote:
> In KLD module makefile i can specify=20
> EXPORT_SYMS=3D  name1, name2, ...
> What does it mean ?
>=20
According to sys/conf/kmod.mk:

# EXPORT_SYMS   A list of symbols that should be exported from the module,
#               or the name of a file containing a list of symbols, or YES
#               to export all symbols.  If not defined, no symbols are
#               exported.

This is used to avoid possible name conflicts between different modules.
All symbols that aren't exported (none are exported by default) will be
made local by objcopy(1).  In the past, two different modules could define
a common global name, and resolution of a name could give unpredictable
results, often resulting in a panic.

Note: if module A depends on symbol S from module B, and the dependency
of A on B is recorded, S should *not* be global.


Cheers,
--=20
Ruslan Ermilov
ru@FreeBSD.org
FreeBSD committer

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