1
0
mirror of git://sourceware.org/git/lvm2.git synced 2024-12-29 15:22:30 +03:00
lvm2/libdm/misc/dmlib.h

88 lines
2.4 KiB
C

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