/* SPDX-License-Identifier: GPL-2.0 */
#include <syscall.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>

static int mlock2_(void *start, size_t len, int flags)
{
        int ret = syscall(__NR_mlock2, start, len, flags);

        if (ret) {
                errno = ret;
                return -1;
        }
        return 0;
}

static FILE *seek_to_smaps_entry(unsigned long addr)
{
        FILE *file;
        char *line = NULL;
        size_t size = 0;
        unsigned long start, end;
        char perms[5];
        unsigned long offset;
        char dev[32];
        unsigned long inode;
        char path[BUFSIZ];

        file = fopen("/proc/self/smaps", "r");
        if (!file)
                ksft_exit_fail_msg("fopen smaps: %s\n", strerror(errno));

        while (getline(&line, &size, file) > 0) {
                if (sscanf(line, "%lx-%lx %s %lx %s %lu %s\n",
                           &start, &end, perms, &offset, dev, &inode, path) < 6)
                        goto next;

                if (start <= addr && addr < end)
                        goto out;

next:
                free(line);
                line = NULL;
                size = 0;
        }

        fclose(file);
        file = NULL;

out:
        free(line);
        return file;
}