1// SPDX-License-Identifier: GPL-2.0
2#define _GNU_SOURCE
3#define __EXPORTED_HEADERS__
4
5#include <stdio.h>
6#include <stdlib.h>
7#include <linux/fcntl.h>
8#include <linux/memfd.h>
9#include <unistd.h>
10#include <sys/syscall.h>
11
12#include "common.h"
13
14int hugetlbfs_test = 0;
15
16/*
17 * Copied from mlock2-tests.c
18 */
19unsigned long default_huge_page_size(void)
20{
21 unsigned long hps = 0;
22 char *line = NULL;
23 size_t linelen = 0;
24 FILE *f = fopen("/proc/meminfo", "r");
25
26 if (!f)
27 return 0;
28 while (getline(&line, &linelen, f) > 0) {
29 if (sscanf(line, "Hugepagesize: %lu kB", &hps) == 1) {
30 hps <<= 10;
31 break;
32 }
33 }
34
35 free(line);
36 fclose(f);
37 return hps;
38}
39
40int sys_memfd_create(const char *name, unsigned int flags)
41{
42 if (hugetlbfs_test)
43 flags |= MFD_HUGETLB;
44
45 return syscall(__NR_memfd_create, name, flags);
46}
47

source code of linux/tools/testing/selftests/memfd/common.c