162306a36Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0 262306a36Sopenharmony_ci#define _GNU_SOURCE 362306a36Sopenharmony_ci#define __EXPORTED_HEADERS__ 462306a36Sopenharmony_ci 562306a36Sopenharmony_ci#include <stdio.h> 662306a36Sopenharmony_ci#include <stdlib.h> 762306a36Sopenharmony_ci#include <linux/fcntl.h> 862306a36Sopenharmony_ci#include <linux/memfd.h> 962306a36Sopenharmony_ci#include <unistd.h> 1062306a36Sopenharmony_ci#include <sys/syscall.h> 1162306a36Sopenharmony_ci 1262306a36Sopenharmony_ci#include "common.h" 1362306a36Sopenharmony_ci 1462306a36Sopenharmony_ciint hugetlbfs_test = 0; 1562306a36Sopenharmony_ci 1662306a36Sopenharmony_ci/* 1762306a36Sopenharmony_ci * Copied from mlock2-tests.c 1862306a36Sopenharmony_ci */ 1962306a36Sopenharmony_ciunsigned long default_huge_page_size(void) 2062306a36Sopenharmony_ci{ 2162306a36Sopenharmony_ci unsigned long hps = 0; 2262306a36Sopenharmony_ci char *line = NULL; 2362306a36Sopenharmony_ci size_t linelen = 0; 2462306a36Sopenharmony_ci FILE *f = fopen("/proc/meminfo", "r"); 2562306a36Sopenharmony_ci 2662306a36Sopenharmony_ci if (!f) 2762306a36Sopenharmony_ci return 0; 2862306a36Sopenharmony_ci while (getline(&line, &linelen, f) > 0) { 2962306a36Sopenharmony_ci if (sscanf(line, "Hugepagesize: %lu kB", &hps) == 1) { 3062306a36Sopenharmony_ci hps <<= 10; 3162306a36Sopenharmony_ci break; 3262306a36Sopenharmony_ci } 3362306a36Sopenharmony_ci } 3462306a36Sopenharmony_ci 3562306a36Sopenharmony_ci free(line); 3662306a36Sopenharmony_ci fclose(f); 3762306a36Sopenharmony_ci return hps; 3862306a36Sopenharmony_ci} 3962306a36Sopenharmony_ci 4062306a36Sopenharmony_ciint sys_memfd_create(const char *name, unsigned int flags) 4162306a36Sopenharmony_ci{ 4262306a36Sopenharmony_ci if (hugetlbfs_test) 4362306a36Sopenharmony_ci flags |= MFD_HUGETLB; 4462306a36Sopenharmony_ci 4562306a36Sopenharmony_ci return syscall(__NR_memfd_create, name, flags); 4662306a36Sopenharmony_ci} 47