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5c0ade35e2
Ensure libdevmapper is included before util.h since we are going to add function that is using it. TODO: maybe add include directly here...
102 lines
3.1 KiB
C
102 lines
3.1 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* This file must be included first by every library source file.
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*/
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#ifndef _DM_LIB_H
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#define _DM_LIB_H
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/*
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* Symbol export control macros
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*
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* DM_EXPORT_NEW_SYMBOL(rettype, func, ver)
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* DM_EXPORT_SYMBOL(func,ver)
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* DM_EXPORT_SYMBOL_BASE(func,ver)
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*
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* For functions that have multiple implementations these macros control
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* symbol export and versioning.
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*
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* Function definitions that exist in only one version never need to use
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* these macros.
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*
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* Backwards compatible implementations must include a version tag of
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* the form "_v1_02_104" as a suffix to the function name and use the
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* macro DM_EXPORT_SYMBOL to export the function and bind it to the
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* specified version string.
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*
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* Since versioning is only available when compiling with GCC the entire
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* compatibility version should be enclosed in '#if defined(GNU_SYMVER)',
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* for example:
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*
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* DM_EXPORT_NEW_SYMBOL(int, dm_foo, 1_02_107)(int bar)
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* {
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* return bar;
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* }
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*
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* #if defined(GNU_SYMVER)
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* // Backward compatible dm_foo() version 1.02.104
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* DM_EXPORT_SYMBOL(dm_foo,1_02_104)
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* int dm_foo_v1_02_104(void);
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* int dm_foo_v1_02_104(void)
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* {
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* return 0;
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* }
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* #endif
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*
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* A prototype for the compatibility version is required as these
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* functions must not be declared static.
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*
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* The DM_EXPORT_SYMBOL_BASE macro is only used to export the base
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* versions of library symbols prior to the introduction of symbol
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* versioning: it must never be used for new symbols.
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*/
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#if defined(GNU_SYMVER)
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# ifdef __has_attribute
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# if __has_attribute(symver)
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# define DM_EXPORT_NEW_SYMBOL(rettype, func, ver) \
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__attribute__((__symver__( #func "@@DM_" #ver ))) \
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__typeof__(func) func ##_v ##ver; \
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rettype func ##_v ##ver
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# define DM_EXPORT_SYMBOL(func, ver) \
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__attribute__((__symver__( #func "@DM_" #ver )))
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# define DM_EXPORT_SYMBOL_BASE(func) \
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__attribute__((__symver__( #func "@Base" )))
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# endif
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# endif
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#ifndef DM_EXPORT_NEW_SYMBOL
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#define DM_EXPORT_NEW_SYMBOL(rettype, func, ver) \
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__typeof__(func) func ##_v ##ver; \
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__asm__(".symver " #func "_v" #ver ", " #func "@@DM_" #ver ); \
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rettype func ##_v ##ver
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#define DM_EXPORT_SYMBOL(func, ver) \
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__asm__(".symver " #func "_v" #ver ", " #func "@DM_" #ver );
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#define DM_EXPORT_SYMBOL_BASE(func) \
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__asm__(".symver " #func "_base, " #func "@Base" );
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#endif
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#else
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#define DM_EXPORT_NEW_SYMBOL(rettype, func, ver) rettype func
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#define DM_EXPORT_SYMBOL(func, ver)
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#define DM_EXPORT_SYMBOL_BASE(func)
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#endif
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#include "libdm/libdevmapper.h"
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#include "libdm/dm-tools/util.h"
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#include "libdm/misc/dm-logging.h"
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#include <unistd.h>
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#endif
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