text: // SPDX-License-Identifier: BSD-3-Clause
  /* Copyright (C) 2018 - 2020 Intel Corporation. */
  
  #include <memkind.h>
  
  #include <limits.h>
  #include <stdio.h>
  #include <stdlib.h>
  
  #define PMEM_MAX_SIZE (1024 * 1024 * 32)
  
  static char path[PATH_MAX] = "/tmp/";
  
  static void print_err_message(int err)
  {
      char error_message[MEMKIND_ERROR_MESSAGE_SIZE];
      memkind_error_message(err, error_message, MEMKIND_ERROR_MESSAGE_SIZE);
      fprintf(stderr, "%s\n", error_message);
  }
  
  int main(int argc, char *argv[])
  {
      struct memkind *pmem_kind = NULL;
      int err = 0;
  
      if (argc > 2) {
          fprintf(stderr, "Usage: %s [pmem_kind_dir_path]\n", argv[0]);
          return 1;
      } else if (argc == 2 && (realpath(argv[1], path) == NULL)) {
          fprintf(stderr, "Incorrect pmem_kind_dir_path %s\n", argv[1]);
          return 1;
      }
  
      fprintf(stdout,
              "This example shows how to use memkind alignment and how it affects allocations.\nPMEM kind directory: %s\n",
              path);
  
      int status = memkind_check_dax_path(path);
      if (!status) {
          fprintf(stdout, "PMEM kind %s is on DAX-enabled file system.\n", path);
      } else {
          fprintf(stdout, "PMEM kind %s is not on DAX-enabled file system.\n", path);
      }
  
      err = memkind_create_pmem(path, PMEM_MAX_SIZE, &pmem_kind);
      if (err) {
          print_err_message(err);
          return 1;
      }
  
      char *pmem_str10 = NULL;
      char *pmem_str11 = NULL;
  
      // Perform two allocations - 32 bytes
      pmem_str10 = (char *)memkind_malloc(pmem_kind, 32);
      if (pmem_str10 == NULL) {
          fprintf(stderr, "Unable to allocate pmem string (pmem_str10).\n");
          return 1;
      }
  
      pmem_str11 = (char *)memkind_malloc(pmem_kind, 32);
      if (pmem_str11 == NULL) {
          fprintf(stderr, "Unable to allocate pmem string (pmem_str11)\n");
          return 1;
      }
  
      // The allocations should be very close to each other in memory
      if (pmem_str11 - pmem_str10 != 32) {
          fprintf(stderr, "Something went wrong with allocations.\n");
          return 1;
      }
  
      memkind_free(pmem_kind, pmem_str10);
      memkind_free(pmem_kind, pmem_str11);
  
      // Perform two allocations - 32 bytes with alignment 64
      err = memkind_posix_memalign(pmem_kind, (void **)&pmem_str10, 64, 32);
      if (err) {
          fprintf(stderr,
                  "Unable to allocate pmem string (pmem_str10) with alignment.\n");
          return 1;
      }
  
      err = memkind_posix_memalign(pmem_kind, (void **)&pmem_str11, 64, 32);
      if (err) {
          fprintf(stderr,
                  "Unable to allocate pmem string (pmem_str11) with alignment.\n");
          return 1;
      }
  
      // The addresses of allocations are not close to each other in memory, they are aligned to 64
      if (pmem_str11 - pmem_str10 != 64) {
          fprintf(stderr, "Something went wrong with alignment allocations.\n");
          return 1;
      }
  
      memkind_free(pmem_kind, pmem_str10);
      memkind_free(pmem_kind, pmem_str11);
  
      err = memkind_destroy_kind(pmem_kind);
      if (err) {
          print_err_message(err);
          return 1;
      }
  
      fprintf(stdout,
              "The memory has been successfully allocated using memkind alignment.\n");
  
      return 0;
  }
  