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Currently libspl is a static archive that is linked into multiple shared objects, which then re-export its symbols. We intend to fix this soon. For the moment though, most programs shipped with OpenZFS depend on two or more of these shared objects, and see the same symbols twice. For functions this is not a problem, as they do not have any mutable state and so the linker can simply select the first one and use that for all. For global data objects however, each shared object will have direct (non-relocatable) references to its own instance of the symbol, such that changes on one will not necessarily be seen by the other. While this shouldn't be a problem in practice as these reexported interfaces are not supposed to be used, they are technically undefined behaviour in C (C17 6.9.2) and are reported by ASAN as a violation of C++'s "One Definition Rule". To fix this, we hide these globals inside their compilation units, and add access functions and macros as appropriate to preserve the existing API (though not ABI). Sponsored-by: https://despairlabs.com/sponsor/ Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Rob Norris <robn@despairlabs.com> Closes #17861
37 lines
1.2 KiB
C
37 lines
1.2 KiB
C
// SPDX-License-Identifier: CDDL-1.0
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or https://opensource.org/licenses/CDDL-1.0.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
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* Copyright (c) 2012, 2018 by Delphix. All rights reserved.
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* Copyright (c) 2012, Joyent, Inc. All rights reserved.
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*/
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#ifndef _LIBSPL_SYS_SYSTM_H
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#define _LIBSPL_SYS_SYSTM_H
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uint64_t libspl_physmem(void);
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#define physmem libspl_physmem()
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#endif
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