tools/testing/selftests/vm/on-fault-limit.c

   1 #include <sys/mman.h>
   2 #include <stdio.h>
   3 #include <unistd.h>
   4 #include <string.h>
   5 #include <sys/time.h>
   6 #include <sys/resource.h>
   7
   8 #ifndef MCL_ONFAULT
   9 #define MCL_ONFAULT (MCL_FUTURE << 1)
  10 #endif
  11
  12 static int test_limit(void)
  13 {
  14         int ret = 1;
  15         struct rlimit lims;
  16         void *map;
  17
  18         if (getrlimit(RLIMIT_MEMLOCK, &lims)) {
  19                 perror("getrlimit");
  20                 return ret;
  21         }
  22
  23         if (mlockall(MCL_CURRENT | MCL_ONFAULT | MCL_FUTURE)) {
  24                 perror("mlockall");
  25                 return ret;
  26         }
  27
  28         map = mmap(NULL, 2 * lims.rlim_max, PROT_READ | PROT_WRITE,
  29                    MAP_PRIVATE | MAP_ANONYMOUS | MAP_POPULATE, 0, 0);
  30         if (map != MAP_FAILED)
  31                 printf("mmap should have failed, but didn't\n");
  32         else {
  33                 ret = 0;
  34                 munmap(map, 2 * lims.rlim_max);
  35         }
  36
  37         munlockall();
  38         return ret;
  39 }
  40
  41 int main(int argc, char **argv)
  42 {
  43         int ret = 0;
  44
  45         ret += test_limit();
  46         return ret;
  47 }