// SPDX-License-Identifier: BSD-3-Clause

/* Copyright (C) 2018 - 2020 Intel Corporation. */

#include <memkind.h>

#include <limits.h>

#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

#include <sys/resource.h>

#define MB (1024 * 1024)

#define HEAP_LIMIT_SIMULATE (1024 * MB)

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[])

{

    const size_t size = 512;

    struct memkind *pmem_kind = NULL;

    int err = 0;

    errno = 0;

    if (argc > 2) {

        fprintf(stderr, "Usage: %s [pmem_kind_dir_path]\n", argv[0]);

        return 1;

    } else if (argc == 2) {

        if (realpath(argv[1], path) == NULL) {

            fprintf(stderr, "Incorrect pmem_kind_dir_path %s\n", argv[1]);

            return 1;

        }

    }

    // Operation below limit the current size of heap

    // to show different place of allocation

    const struct rlimit heap_limit = { HEAP_LIMIT_SIMULATE, HEAP_LIMIT_SIMULATE };

    err = setrlimit(RLIMIT_DATA, &heap_limit);

    if (err) {

        fprintf(stderr, "Unable to set heap limit.\n");

        return 1;

    }

    char *ptr_default = NULL;

    char *ptr_default_not_possible = NULL;

    char *ptr_pmem = NULL;

    fprintf(stdout,

            "This example shows how to allocate memory using standard memory (MEMKIND_DEFAULT) "

            "and file-backed kind of memory (PMEM).\nPMEM kind directory: %s\n", path);

    err = memkind_create_pmem(path, 0, &pmem_kind);

    if (err) {

        print_err_message(err);

        return 1;

    }

    ptr_default = (char *)memkind_malloc(MEMKIND_DEFAULT, size);

    if (!ptr_default) {

        fprintf(stderr, "Unable allocate 512 bytes in standard memory.\n");

        return 1;

    }

    errno = 0;

    ptr_default_not_possible = (char *)memkind_malloc(MEMKIND_DEFAULT,

                                                      HEAP_LIMIT_SIMULATE);

    if (ptr_default_not_possible) {

        fprintf(stderr,

                "Failure, this allocation should not be possible "

                "(expected result was NULL), because of setlimit function.\n");

        return 1;

    }

    if (errno != ENOMEM) {

        fprintf(stderr,

                "Failure, this allocation should set errno to ENOMEM value, because of setlimit function.\n");

        return 1;

    }

    errno = 0;

    ptr_pmem = (char *)memkind_malloc(pmem_kind, HEAP_LIMIT_SIMULATE);

    if (!ptr_pmem) {

        fprintf(stderr, "Unable allocate HEAP_LIMIT_SIMULATE in file-backed memory.\n");

        return 1;

    }

    if (errno != 0) {

        fprintf(stderr, "Failure, this allocation should not set errno value.\n");

        return 1;

    }

    sprintf(ptr_default, "Hello world from standard memory - ptr_default.\n");

    sprintf(ptr_pmem, "Hello world from file-backed memory - ptr_pmem.\n");

    fprintf(stdout, "%s", ptr_default);

    fprintf(stdout, "%s", ptr_pmem);

    memkind_free(MEMKIND_DEFAULT, ptr_default);

    memkind_free(pmem_kind, ptr_pmem);

    err = memkind_destroy_kind(pmem_kind);

    if (err) {

        print_err_message(err);

        return 1;

    }

    fprintf(stdout, "Memory was successfully allocated and released.\n");

    return 0;

}