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

   1// SPDX-License-Identifier: GPL-2.0
   2#include <sys/mman.h>
   3#include <stdio.h>
   4#include <unistd.h>
   5#include <string.h>
   6#include <sys/time.h>
   7#include <sys/resource.h>
   8
   9#ifndef MCL_ONFAULT
  10#define MCL_ONFAULT (MCL_FUTURE << 1)
  11#endif
  12
  13static int test_limit(void)
  14{
  15        int ret = 1;
  16        struct rlimit lims;
  17        void *map;
  18
  19        if (getrlimit(RLIMIT_MEMLOCK, &lims)) {
  20                perror("getrlimit");
  21                return ret;
  22        }
  23
  24        if (mlockall(MCL_ONFAULT | MCL_FUTURE)) {
  25                perror("mlockall");
  26                return ret;
  27        }
  28
  29        map = mmap(NULL, 2 * lims.rlim_max, PROT_READ | PROT_WRITE,
  30                   MAP_PRIVATE | MAP_ANONYMOUS | MAP_POPULATE, -1, 0);
  31        if (map != MAP_FAILED)
  32                printf("mmap should have failed, but didn't\n");
  33        else {
  34                ret = 0;
  35                munmap(map, 2 * lims.rlim_max);
  36        }
  37
  38        munlockall();
  39        return ret;
  40}
  41
  42int main(int argc, char **argv)
  43{
  44        int ret = 0;
  45
  46        ret += test_limit();
  47        return ret;
  48}
  49