text: /*
   * Copyright 2014-2018, Intel Corporation
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   *     * Redistributions of source code must retain the above copyright
   *       notice, this list of conditions and the following disclaimer.
   *
   *     * Redistributions in binary form must reproduce the above copyright
   *       notice, this list of conditions and the following disclaimer in
   *       the documentation and/or other materials provided with the
   *       distribution.
   *
   *     * Neither the name of the copyright holder nor the names of its
   *       contributors may be used to endorse or promote products derived
   *       from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  /*
   * pmem_posix.c -- pmem utilities with Posix implementation
   */
  
  #include <stddef.h>
  #include <sys/mman.h>
  
  #include "pmem.h"
  #include "out.h"
  #include "mmap.h"
  
  /*
   * is_pmem_detect -- implement pmem_is_pmem()
   *
   * This function returns true only if the entire range can be confirmed
   * as being direct access persistent memory.  Finding any part of the
   * range is not direct access, or failing to look up the information
   * because it is unmapped or because any sort of error happens, just
   * results in returning false.
   */
  int
  is_pmem_detect(const void *addr, size_t len)
  {
  	LOG(3, "addr %p len %zu", addr, len);
  
  	if (len == 0)
  		return 0;
  
  	int retval = util_range_is_pmem(addr, len);
  
  	LOG(4, "returning %d", retval);
  	return retval;
  }
  
  /*
   * pmem_map_register -- memory map file and register mapping
   */
  void *
  pmem_map_register(int fd, size_t len, const char *path, int is_dev_dax)
  {
  	LOG(3, "fd %d len %zu path %s id_dev_dax %d",
  			fd, len, path, is_dev_dax);
  
  	void *addr;
  	int map_sync;
  	addr = util_map(fd, len, MAP_SHARED, 0, 0, &map_sync);
  	if (!addr)
  		return NULL;
  
  	enum pmem_map_type type = MAX_PMEM_TYPE;
  	if (is_dev_dax)
  		type = PMEM_DEV_DAX;
  	else if (map_sync)
  		type = PMEM_MAP_SYNC;
  
  	if (type != MAX_PMEM_TYPE) {
  		if (util_range_register(addr, len, path, type)) {
  			LOG(1, "can't track mapped region");
  			goto err_unmap;
  		}
  	}
  
  	return addr;
  err_unmap:
  	util_unmap(addr, len);
  	return NULL;
  }
  
  /*
   * pmem_os_init -- os-dependent part of pmem initialization
   */
  void
  pmem_os_init(void)
  {
  	LOG(3, NULL);
  }
  