LXR linux/tools/testing/selftests/vm/mlock2.h

   1#include <syscall.h>
   2#include <errno.h>
   3#include <stdio.h>
   4#include <stdlib.h>
   5
   6#ifndef MLOCK_ONFAULT
   7#define MLOCK_ONFAULT 1
   8#endif
   9
  10#ifndef MCL_ONFAULT
  11#define MCL_ONFAULT (MCL_FUTURE << 1)
  12#endif
  13
  14static int mlock2_(void *start, size_t len, int flags)
  15{
  16#ifdef __NR_mlock2
  17        return syscall(__NR_mlock2, start, len, flags);
  18#else
  19        errno = ENOSYS;
  20        return -1;
  21#endif
  22}
  23
  24static FILE *seek_to_smaps_entry(unsigned long addr)
  25{
  26        FILE *file;
  27        char *line = NULL;
  28        size_t size = 0;
  29        unsigned long start, end;
  30        char perms[5];
  31        unsigned long offset;
  32        char dev[32];
  33        unsigned long inode;
  34        char path[BUFSIZ];
  35
  36        file = fopen("/proc/self/smaps", "r");
  37        if (!file) {
  38                perror("fopen smaps");
  39                _exit(1);
  40        }
  41
  42        while (getline(&line, &size, file) > 0) {
  43                if (sscanf(line, "%lx-%lx %s %lx %s %lu %s\n",
  44                           &start, &end, perms, &offset, dev, &inode, path) < 6)
  45                        goto next;
  46
  47                if (start <= addr && addr < end)
  48                        goto out;
  49
  50next:
  51                free(line);
  52                line = NULL;
  53                size = 0;
  54        }
  55
  56        fclose(file);
  57        file = NULL;
  58
  59out:
  60        free(line);
  61        return file;
  62}
  63