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
  14 static 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
  24 static 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
  50 next:
  51                 free(line);
  52                 line = NULL;
  53                 size = 0;
  54         }
  55
  56         fclose(file);
  57         file = NULL;
  58
  59 out:
  60         free(line);
  61         return file;
  62 }