text: /*
   * Copyright (C) 2010-2015 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
   */
  
  /*
   * Wrappers around liblvm2cmd functions for dmeventd plug-ins.
   *
   * liblvm2cmd is not thread-safe so the locking in this library helps dmeventd
   * threads to co-operate in sharing a single instance.
   *
   * FIXME Either support this properly as a generic liblvm2cmd wrapper or make
   * liblvm2cmd thread-safe so this can go away.
   */
  
  #ifndef _DMEVENTD_LVMWRAP_H
  #define _DMEVENTD_LVMWRAP_H
  
  struct dm_pool;
  
  int dmeventd_lvm2_init(void);
  void dmeventd_lvm2_exit(void);
  int dmeventd_lvm2_run(const char *cmdline);
  
  void dmeventd_lvm2_lock(void);
  void dmeventd_lvm2_unlock(void);
  
  struct dm_pool *dmeventd_lvm2_pool(void);
  
  int dmeventd_lvm2_command(struct dm_pool *mem, char *buffer, size_t size,
  			  const char *cmd, const char *device);
  
  #define dmeventd_lvm2_run_with_lock(cmdline) \
  	({\
  		int rc;\
  		dmeventd_lvm2_lock();\
  		rc = dmeventd_lvm2_run(cmdline);\
  		dmeventd_lvm2_unlock();\
  		rc;\
  	})
  
  #define dmeventd_lvm2_init_with_pool(name, st) \
  	({\
  		struct dm_pool *mem;\
  		st = NULL;\
  		if (dmeventd_lvm2_init()) {\
  			if ((mem = dm_pool_create(name, 2048)) &&\
  			    (st = dm_pool_zalloc(mem, sizeof(*st))))\
  				st->mem = mem;\
  			else {\
  				if (mem)\
  					dm_pool_destroy(mem);\
  				dmeventd_lvm2_exit();\
  			}\
  		}\
  		st;\
  	})
  
  #define dmeventd_lvm2_exit_with_pool(pool) \
  	do {\
  		dm_pool_destroy(pool->mem);\
  		dmeventd_lvm2_exit();\
  	} while(0)
  
  #endif /* _DMEVENTD_LVMWRAP_H */
  