text: /*
   * Copyright (c) 2014-2015, 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 Intel Corporation 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 LOG OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  /*
   * simple_copy.c -- show how to use pmem_memcpy_persist()
   *
   * usage: simple_copy src-file dst-file
   *
   * Reads 4k from src-file and writes it to dst-file.
   */
  
  #include <sys/types.h>
  #include <sys/stat.h>
  #include <fcntl.h>
  #include <stdio.h>
  #include <errno.h>
  #include <stdlib.h>
  #include <unistd.h>
  #include <string.h>
  #include <libpmem.h>
  
  /* just copying 4k to pmem for this example */
  #define	BUF_LEN 4096
  
  int
  main(int argc, char *argv[])
  {
  	int srcfd;
  	int dstfd;
  	char buf[BUF_LEN];
  	char *pmemaddr;
  	int is_pmem;
  	int cc;
  
  	if (argc != 3) {
  		fprintf(stderr, "usage: %s src-file dst-file\n", argv[0]);
  		exit(1);
  	}
  
  	/* open src-file */
  	if ((srcfd = open(argv[1], O_RDONLY)) < 0) {
  		perror(argv[1]);
  		exit(1);
  	}
  
  	/* create a pmem file */
  	if ((dstfd = open(argv[2], O_CREAT|O_EXCL|O_RDWR, 0666)) < 0) {
  		perror(argv[2]);
  		exit(1);
  	}
  
  	/* allocate the pmem */
  	if ((errno = posix_fallocate(dstfd, 0, BUF_LEN)) != 0) {
  		perror("posix_fallocate");
  		exit(1);
  	}
  
  	/* memory map it */
  	if ((pmemaddr = pmem_map(dstfd)) == NULL) {
  		perror("pmem_map");
  		exit(1);
  	}
  	close(dstfd);
  
  	/* determine if range is true pmem */
  	is_pmem = pmem_is_pmem(pmemaddr, BUF_LEN);
  
  	/* read up to BUF_LEN from srcfd */
  	if ((cc = read(srcfd, buf, BUF_LEN)) < 0) {
  		pmem_unmap(pmemaddr, BUF_LEN);
  		perror("read");
  		exit(1);
  	}
  
  	/* write it to the pmem */
  	if (is_pmem) {
  		pmem_memcpy_persist(pmemaddr, buf, cc);
  	} else {
  		memcpy(pmemaddr, buf, cc);
  		pmem_msync(pmemaddr, cc);
  	}
  
  	close(srcfd);
  	pmem_unmap(pmemaddr, BUF_LEN);
  
  	exit(0);
  }
  